Westport Ins. Corp. v. California Casualty Mgt. ( 2019 )


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  •                      FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    WESTPORT INSURANCE                                No. 17-15924
    CORPORATION,
    Plaintiff-Appellee,                  D.C. No.
    3:16-cv-01246-
    v.                              WHO
    CALIFORNIA CASUALTY
    MANAGEMENT COMPANY, DBA                             OPINION
    California Casualty,
    Defendant-Appellant.
    Appeal from the United States District Court
    for the Northern District of California
    William Horsley Orrick, District Judge, Presiding
    Argued and Submitted November 15, 2018
    San Francisco, California
    Filed February 20, 2019
    Before: RAYMOND C. FISHER, and MILAN D. SMITH,
    JR., Circuit Judges, and LAWRENCE L. PIERSOL*
    District Judge.
    Opinion by Judge Milan D. Smith, Jr.
    *
    The Honorable Lawrence L. Piersol, United States District Judge
    for the District of South Dakota, sitting by designation.
    2        WESTPORT INS. V. CALIF. CASUALTY MGMT.
    SUMMARY **
    California Insurance Law
    The panel affirmed the district court’s summary
    judgment entered in favor of Westport Insurance Company
    in a diversity insurance coverage action concerning claims
    for $15.8 million brought by three former students against
    Moraga School District and three of its school
    administrators.
    Westport, the primary and excess insurer of the District,
    defended and settled the claims for $15.8 million, and sought
    repayment from the administrators’ insurer, California
    Casualty Management Company. The district court found
    California Casualty liable for $2.6 million of the $15.8
    million paid to the underlying plaintiffs collectively.
    California Casualty asserted that California Government
    Code § 825.4, which prohibits public entities from seeking
    indemnification from its employees, barred Westport’s
    lawsuit because the administrators were public employees,
    and therefore, the District must defend and pay the entire
    settlement fee without California Casualty’s contribution.
    The panel held that § 825.4 did not preclude Westport’s
    claim because § 825.4 does not contain a blanket ban on an
    employee’s insurer contributing to the employee’s defense
    and settlement costs. The panel further held that, here, the
    obligation to defend and indemnify still rested with the
    public entity and its insurer despite contribution from the
    employee’s insurance.
    **
    This summary constitutes no part of the opinion of the court. It
    has been prepared by court staff for the convenience of the reader.
    WESTPORT INS. V. CALIF. CASUALTY MGMT.               3
    California Casualty next asserted that that it was not
    obligated to contribute to the settlements because its policy
    covered excess payments only when all other policies had
    been exhausted, and Westport’s primary and excess policies
    were sufficient to cover the total amount of the settlements.
    The panel held that this claim was contrary to the plain text
    of California Casualty’s policy. The panel construed
    California Casualty’s policy to apply upon the exhaustion of
    the $1 million of underlying insurance, not after exhaustion
    of all other insurance.
    California Casualty challenged the apportionment of
    liability with Westport on a number of grounds. The panel
    held that California Casualty waived its argument that the
    lack of contemporaneous allocation of liability in the
    settlements precluded subsequent apportionment. Next, the
    panel held that given the blended pleadings and wordings of
    the settlement agreements, the district court did not abuse its
    discretion in allocating the liability equally among the
    District and the three administrators. The panel rejected
    California Casualty’s challenge to the district court’s finding
    that Westport only needed to pay $1 million per occurrence
    instead of $1 million per occurrence per insured, totaling $3
    million. The panel further held that California Casualty’s
    policy coverage began upon exhaustion of Westport’s
    primary policy when Westport paid $1 million per policy per
    student. The panel rejected California Casualty’s contention
    that its coverage should prorate with Westport’s coverage.
    The panel held that the district court did not abuse its
    discretion in awarding prejudgment interest at ten percent
    from the dates Westport paid the settlements.
    4      WESTPORT INS. V. CALIF. CASUALTY MGMT.
    COUNSEL
    Mark G. Bonino (argued), Charles E. Tillage, and Elizabeth
    J. Moul, Hayes Scott Bonino Ellingson Guslani Simonson &
    Clause LLP, San Carlos, California, for Defendant-
    Appellant.
    Adam H. Fleischer (argued), Michael H. Passman, and Mark
    G. Sheridan, Bates Carey LLP, Chicago, Illinois; Michael K.
    Johnson, Lewis Brisbois Bisgaard & Smith LLP, San
    Francisco, California; for Plaintiff-Appellee.
    OPINION
    M. SMITH, Circuit Judge:
    This appeal involves a dispute between two insurance
    companies that arose after the settlement of certain claims
    brought against their insureds. After Westport Insurance
    Corporation (Westport) defended and settled claims for
    $15.8 million brought by three former students against
    Moraga School District (the District) and three of its school
    administrators, it sought repayment from the administrators’
    insurer, California Casualty Management Company
    (California Casualty). The two insurers cross-moved for
    summary judgment, and the district court held that
    California Casualty owed Westport $2.6 million plus
    $755,637.20 in prejudgment interest. We affirm.
    BACKGROUND
    Westport, through a predecessor company, issued
    primary general liability insurance policies (Westport’s
    Primary policy) to the District from 1991 through 1997.
    From October 1, 1994 to October 1, 1997, Westport also
    WESTPORT INS. V. CALIF. CASUALTY MGMT.               5
    issued a series of annual excess policies that covered the
    District and its employees (Westport’s Excess policy).
    California Casualty issued successive annual liability
    policies to the Association of California School
    Administrators from at least July 1, 1986 to July 1, 2000.
    California Casualty provided excess liability to the District’s
    school administrators under this policy’s Coverage A plan,
    titled Administrators Excess Liability (California Casualty’s
    policy).
    To provide a framework for our analysis, we first outline
    the claims included in the underlying lawsuits. On January
    29, 2013, Doe 1 and Doe 2, two former students of the
    Moraga School District, filed suit in the Superior Court for
    Contra Costa County, California against the District and
    three of its school Administrators—William Walters, John
    Cooley, and Paul Simonin. Earlier that same month, another
    former student, Doe 3, also sued the three Administrators
    and the District. In these lawsuits, the several Does alleged
    that the District’s employee, Daniel Witters, sexually
    molested them in the mid-1990s while he was their middle
    school teacher. The Does alleged that the Administrators
    received warnings about the molestations, but the
    Administrators failed to act to stop Witters. When the
    students came forward in 1996, Witters killed himself. In
    their lawsuits, Doe 1 alleged that Witters molested her
    during policy periods 1993–94, 1994–95, and 1995–96; Doe
    2 alleged that she was molested in the 1995–96 and 1996–97
    periods; and Doe 3 alleged that she was molested in the
    1996–97 period.
    6      WESTPORT INS. V. CALIF. CASUALTY MGMT.
    In January 2013, both Westport and California Casualty
    attended an unsuccessful mediation of the Does’ lawsuits.
    The Doe 3 lawsuit eventually settled separately for
    $1.8 million in August 2013, but Westport appears to have
    paid the settlement on July 29, 2013, prior to the signing of
    the settlement agreement. In June 2014, California Casualty
    and Westport also attended a mediation for the lawsuit
    brought by Does 1 and 2. At the mediation, Does 1 and 2
    settled their lawsuit for $7 million each. On June 26, 2014,
    Westport paid Does 1 and 2.              California Casualty
    subsequently refused to contribute to any of the Does’
    settlements (the Settlements), and Westport funded the
    entirety of these Settlements in the aggregate sum of
    $15.8 million.
    On July 11, 2014, Westport demanded that California
    Casualty pay its share of the Settlements, but received no
    response. Westport wrote to California Casualty three
    additional times, and received no response. After Westport’s
    October 30, 2014 demand, California Casualty finally
    replied and refused to reimburse Westport.
    Westport then filed suit against California Casualty on
    April 13, 2015 in federal court. After the parties brought
    cross-motions for summary judgment, the district court
    entered summary judgment in favor of Westport for
    $2.6 million plus interest. A month later, the district court
    added $755,637.20 of prejudgment interest to the judgment.
    California Casualty timely appealed.
    JURISDICTION AND STANDARD OF REVIEW
    We have jurisdiction over this appeal pursuant to
    
    28 U.S.C. § 1291
    . We review the district court’s grant or
    denial of summary judgment de novo. Evanston Ins. Co. v.
    OEA, Inc., 
    566 F.3d 915
    , 918 (9th Cir. 2009). We also
    WESTPORT INS. V. CALIF. CASUALTY MGMT.              7
    review its interpretation of state law and the insurance
    policies de novo. 
    Id. at 920
    ; Stanford Ranch, Inc. v.
    Maryland Cas. Co., 
    89 F.3d 618
    , 624 (9th Cir. 1996). The
    district court’s award of prejudgment interest is reviewed for
    abuse of discretion. Mutuelles Unies v. Kroll & Linstrom,
    
    957 F.2d 707
    , 714 (9th Cir. 1992).
    ANALYSIS
    I. Indemnification pursuant to California Government
    Code § 825.4
    As a threshold matter, California Casualty asserts that
    California Government Code § 825.4 (§ 825.4), which
    prohibits public entities from seeking indemnification from
    its employees, bars Westport’s lawsuit. California Casualty
    contends that because the Administrators were public
    employees, the District must defend and pay the entire
    settlement fee without its contribution. The California
    Supreme Court has not spoken directly on this issue, so “we
    must determine what result the court would reach based on
    state appellate court opinions, statutes and treatises.”
    Evanston, 
    566 F.3d at 921
     (quoting Paulson v. City of San
    Diego, 
    294 F.3d 1124
    , 1128 (9th Cir. 2002) (en banc)).
    Section 825.4 provides:
    Except as provided in Section 825.6, if a
    public entity pays any claim or judgment
    against itself or against an employee or
    former employee of the public entity, or any
    portion thereof, for an injury arising out of an
    act or omission of the employee or former
    8        WESTPORT INS. V. CALIF. CASUALTY MGMT.
    employee of the public entity, he is not liable
    to indemnify the public entity.
    Cal. Gov’t Code § 825.4. 1
    Only a few California Court of Appeal cases analyze
    § 825.4. Westport primarily relies on a line of cases
    beginning with Oxnard Union High School District v.
    Teachers Insurance Co., 
    99 Cal. Rptr. 478
     (Ct. App. 1971),
    whereas California Casualty cites to Pacific Indemnity v.
    American Mutual Insurance Co., 
    105 Cal. Rptr. 295
     (Ct.
    App. 1975).
    Unfortunately, neither set of cases definitively addresses
    the factual pattern present in this case. Nevertheless, we
    affirm the district court’s conclusion that § 825.4 does not
    preclude Westport’s claim because § 825.4 does not contain
    a blanket ban on an employee’s insurer contributing to the
    employee’s defense and settlement costs. Here, the
    obligation to defend and indemnify still rests with the public
    entity and its insurer despite contribution from the
    employee’s insurance. We find support for our holding in
    the principles animating the several § 825.4 cases.
    In Oxnard, the California Court of Appeal held that
    although the teacher-employee’s school district was
    “obligated to pay in full” the settlement of an automobile
    crash negligence action against the teacher, the school
    district had discharged its liability by using the teacher’s
    1
    The exceptions set forth in § 825.6 contemplate whether the
    employee or former employee “acted or failed to act because of actual
    fraud, corruption, or actual malice, or willfully failed or refused to
    conduct the defense of the claim or action in good faith.” Cal. Gov’t
    Code § 825.6. Neither party claims that these exceptions are at issue in
    this case.
    WESTPORT INS. V. CALIF. CASUALTY MGMT.                    9
    insurance as primary coverage and its own insurance as
    excess coverage. 99 Cal. Rptr. at 480. Oxnard’s progeny
    similarly involved automobile accidents committed by
    employees during the scope of their employment. 2
    In the first case, the teacher-employee’s automobile
    insurer, GEICO, defended a negligence suit against the
    teacher, paid the settlement, and then sought to recoup the
    amount paid from the school district’s insurer. Gov’t Emps.
    Ins. Co. v. Gibraltar Cas. Co., 
    229 Cal. Rptr. 57
    , 60 (Ct.
    App. 1986). After considering the relevant portions of the
    automobile policy and the insurance code, the court
    concluded that the school district “was itself an insured
    under the GEICO policy,” due to the language in GEICO’s
    policy that defined persons insured as “any other person or
    organization for his or its liability because of the acts or
    omissions of any insured.” 
    Id. at 64
     (emphasis added).
    Thus, the school district satisfied its statutory obligation by
    availing itself of the employee’s automotive insurance
    policy as long as the employee remained fully covered. 
    Id. at 65
    .
    Similarly, in Younker v. County of San Diego, a
    firefighter-employee and his automobile insurer sued the
    county-employer to recover expenses for defending and
    settling a claim against the firefighter arising from an
    automobile crash. 
    285 Cal. Rptr. 319
    , 321 (Ct. App. 1991).
    The court first determined that the county was an insured
    pursuant to the terms of the employee’s automobile policy
    because it was “clearly a person or organization liable
    because of [the employee’s] acts or omissions” as defined
    2
    Oxnard involved Section 825, which covers defense by a public
    entity, not § 825.4 specifically. Nevertheless, Oxnard’s progeny
    involved automobile accidents committed by employees and public
    entity indemnification under § 825.4.
    10       WESTPORT INS. V. CALIF. CASUALTY MGMT.
    under the policy. Id. at 323. The court then held that the
    county properly looked to the employee’s insurer to fulfill
    its own statutory obligation, thereby rejecting the
    employee’s argument that using the proceeds of his policy
    for the settlement contravened § 825.4. Id. at 323–24.
    In contrast, the court in Pacific Indemnity barred an
    insurer’s attempt for settlement cost recovery from the
    employee’s insurance. There, a patient sued a physician
    employed by the University of California (UC) for injuries
    caused by the physician-employee’s medical services.
    105 Cal. Rptr. at 296. After the settlement, the UC’s insurer
    brought an action for contribution against the physician’s
    insurer. Id. The California Court of Appeal first noted that
    under § 825.4, primary liability for the expenses of the
    settlement lay with the UC, and thus the insurer “c[ould]
    only secure contribution if there is other insurance covering
    the obligation of the Regents.” Id. at 302. The court held
    that the UC’s insurer could not look to the physician’s
    insurer for contribution because to do so would not be
    consistent with California’s policy rationale of public
    entities indemnifying their employees. Id. at 303. 3 The
    court distinguished Oxnard and observed it should not apply
    where “there is neither concession nor contract provision
    which renders the employee’s insurance available for the
    satisfaction of the public entity’s obligation to the victim or
    . . . its employee.” Id. at 305.
    Several principles discernable from the Oxnard and
    Pacific Indemnity line of cases guide our conclusion that
    3
    In Pacific Indemnity, the court was particularly concerned because
    the employee’s personal policy did not just cover claims arising in the
    course of employment but any acts or omissions that were not within the
    scope of the employment. The court noted that this impermissibly placed
    the burden of insurance on the employee personally.
    WESTPORT INS. V. CALIF. CASUALTY MGMT.                11
    § 825.4 does not preclude Westport’s suit.                 First,
    indemnification pursuant to § 825.4 is not wholly
    inconsistent with contribution from an employee’s insurer.
    In Oxnard and its progeny, the courts expressly permitted
    the employees’ personal insurance, albeit automotive, to pay
    the entirety or majority of the settlement, even though the
    courts first found that the public entities were liable pursuant
    to the provisions of Section 825. Even in Pacific Indemnity,
    the court noted that another insurer could contribute to
    settlement costs if the language of that insurance policy also
    covered the public entity’s obligation. 105 Cal. Rptr. at 296.
    Second, the employee and his employer do not occupy
    equivalent positions for purposes of indemnification
    analysis. In both Younker and Gibraltar, the courts
    differentiated between the employee and his insurer when
    considering whether Section 825’s prohibition on a public
    entity seeking indemnity from its employee required the
    entities’ insurers to reimburse the employees’ insurers. The
    courts rejected the employees’ insurers’ position in part
    because none of the employees had personally contributed
    to the settlement costs. Younker, 285 Cal. Rptr. at 323
    (noting the employee “did not foot the bill”); Gibraltar,
    229 Cal. Rptr. at 61 (noting employee “paid nothing” of the
    settlement).
    Third, where the employee’s policy is available to the
    public entity as an insured, contribution to the defense and
    settlement costs may be permitted. Pacific Indemnity,
    Younker, and Gibraltar all recognized this principle either
    explicitly, as in Pacific Indemnity, or implicitly by first
    finding that the entity-employer was an insured under the
    employee’s policy, as in Younker and Gibraltar.
    Here, policy concerns regarding the proper placement of
    the burden of settlement costs are assuaged. The District
    12      WESTPORT INS. V. CALIF. CASUALTY MGMT.
    furnished primary and excess insurance to its Administrators
    through Westport. There is no evidence in the record, and
    neither party claims, that any of the Administrators
    personally contributed to the settlement. That their insurer,
    California Casualty, is now being called upon to provide its
    excess coverage to cover the employees’ settlements does
    not violate the intent behind § 825.4 indemnification. In
    addition, California Casualty’s policy is limited to claims
    arising in the course of employment.
    Furthermore, Pacific Indemnity held that a “concession”
    or “contract provision which renders the employee’s
    insurance available for the satisfaction of the public entity’s
    obligation” would satisfy § 825.4. 105 Cal. Rptr. at 304.
    California Casualty’s policy contemplates this exact
    situation when it states that the underlying primary insurance
    must be provided under one of several sections of the
    Education Code, Cal. Gov’t Code §§ 825 or 825.4 or
    provided on behalf of the insured by any public educational
    entity.
    For these reasons, we hold that § 825.4 does not preclude
    Westport’s claim against California Casualty for repayment
    of a portion of the Settlements.
    II. Interpretation of       Westport’s      and    California
    Casualty’s Policies
    California Casualty next claims that it is not obligated to
    contribute to the Settlements because its policy covers
    excess payments only when all other policies have been
    exhausted, and Westport’s Primary and Excess policies are
    sufficient to cover the total amount of the Settlements.
    Westport counters that this claim is contrary to the plain text
    of California Casualty’s policy. We agree with Westport.
    WESTPORT INS. V. CALIF. CASUALTY MGMT.             13
    Under California law, interpretation of insurance
    policies “follows the general rules of contract
    interpretation.” TRB Invs., Inc. v. Fireman’s Fund Ins. Co.,
    
    145 P.3d 472
    , 477 (Cal. 2006). Courts construe policy
    provisions in their ordinary and popular senses, unless used
    by the parties in a technical manner or with a special
    meaning. 
    Id.
     Insurance coverage is also construed broadly
    “so as to afford the greatest possible protection to the
    insured, whereas exclusionary clauses are to be interpreted
    narrowly against the insurer.” 
    Id.
    California Casualty’s policy covers “all damages in
    excess of the required underlying primary collectible
    insurance or self-insurance.” Administrator excess liability
    is capped at $150,000 per occurrence per insured, over the
    $1 million underlying primary layer, and the policy has a
    $2 million aggregate limit per annual policy period. The
    exclusions further explain, “There shall be no insurance
    afforded under this policy until the required $1 million limit
    of liability afforded the insured by such other insurance or
    self-insurance is exhausted.”
    These provisions clarify that California Casualty’s
    insurance is not “excess over all other insurance” as it
    claims. California Casualty’s policy is certainly an “excess”
    policy, but it requires only that the “underlying primary
    collectible insurance or self-insurance” be exhausted before
    its coverage begins. The policy requires the exhaustion of
    only “primary” or “self” insurance as opposed to “all other”
    insurance or “primary and excess” insurance.
    Comparatively, Westport’s Excess policy states, “If there is
    any other collectible insurance available to the insured . . .
    [this insurance] will apply in excess of other collectible
    insurance.” (Emphasis added.) See Carmel Dev. Co. v. RLI
    Ins. Co., 
    24 Cal. Rptr. 3d 588
    , 592, 598 (Ct. App. 2005)
    14         WESTPORT INS. V. CALIF. CASUALTY MGMT.
    (finding insurance policy that stated it would pay “sums in
    excess of Primary Insurance” was triggered prior to a policy
    that applied in excess of other “primary, excess or excess-
    contingent insurance”). 4      Accordingly, we construe
    California Casualty’s policy to apply upon the exhaustion of
    the $1 million of underlying insurance, not after exhaustion
    of all other insurance.
    III.       Apportionment of Liability
    The district court allocated liability between Westport
    and California Casualty in the following manner. First, the
    court divided each Doe’s settlement equally across the
    policy period(s) in which she alleged she was molested.
    Next, the court reduced each policy period amount by
    25 percent to reflect the District’s liability. Then, the court
    deducted $1 million from each policy period in accordance
    with Westport’s Primary policy limit. Finally, the court
    assessed liability against California Casualty up to $150,000
    for each Administrator in each policy period. 5 In total, the
    district court found California Casualty liable for
    4
    California Casualty also notes that its low premium is indicative of
    its position as extreme excess coverage. This argument deserves only
    short shrift. California Casualty does not point to any authority that
    premium size determines priority of coverage. Moreover, California
    Casualty’s corporate designee testified that the amount of the premium
    does not determine the policy’s order of payment.
    5
    To illustrate, Doe 1’s $7 million settlement was divided into three
    amounts of $2,333,333 for each of the policy periods 1993–94, 1994–
    95, and 1995–96. Next, in each of these periods, the court reduced the
    amount by 25 percent to $1.75 million. Then, the court deducted
    $1 million of Westport’s primary limit, leaving $750,000. The court
    then assessed $150,000 per administrator for a total of $450,000 against
    California Casualty.
    WESTPORT INS. V. CALIF. CASUALTY MGMT.                15
    $2.6 million of the $15.8 million paid to the Does
    collectively.
    California Casualty contends that it should not contribute
    to the Settlements for the following reasons: (1) the
    allocation of liability among the defendants was erroneous;
    (2) Westport did not pay the mandatory $1 million per
    administrator per student per policy period; (3) California
    Casualty’s policy does not trigger until $1 million is paid per
    administrator per student for each policy period; and
    (4) even if California Casualty were obligated to contribute,
    its apportioned contributions for the Administrators should
    prorate along with Westport’s policies. We consider each
    argument in turn.
    A. Allocation of Liability Among the Administrators
    and the District
    California Casualty first argues that the district court was
    unable to properly apportion any liability to it. Although
    California Casualty’s duty to defend did not rise until
    exhaustion of the primary layer of coverage, it denied excess
    coverage in the face of settlement demands far exceeding the
    primary layer. As the district court noted, in United Services
    Automotive Association v. Alaska Insurance Co., 
    114 Cal. Rptr. 2d 449
    , 453 (Ct. App. 2001), the court held that “when
    an excess insurer denies excess coverage for a third party
    claim, it waives the right to challenge the reasonableness of
    the primary insurer’s settlement of the claim.” Therefore,
    California Casualty has waived its argument that the lack of
    contemporaneous allocation of liability in the Settlements
    precludes subsequent apportionment.
    Because California Casualty is only liable for the
    Administrators’ liability, it next argues that the district court
    erroneously allocated the Settlements equally among the
    16       WESTPORT INS. V. CALIF. CASUALTY MGMT.
    four underlying defendants. Under California law, trial
    courts have “equitable discretion to fashion a method of
    allocation suited to the particular facts of each case and the
    interests of justice, subject to appellate review for abuse of
    that discretion.” Golden Eagle Ins. Co. v. Ins. Co. of the
    West, 
    121 Cal. Rptr. 2d 682
    , 693 (Ct. App. 2002). Moreover,
    “there is no single method of allocating defense or indemnity
    costs among co-insurers.” 
    Id.
    The district court divided liability equally among the
    four defendants, and cited Great American Insurance Co. v.
    Sequoia Insurance Co., 
    2016 WL 844819
     (C.D. Cal. Mar. 1,
    2016), appeal dismissed, No. 16-56080 (9th Cir. Mar. 2,
    2018), in support of its decision. In Great American, the
    court determined that it had the discretion to allocate liability
    equally between the co-defendants in a case where the
    settlement agreement did not specifically allocate
    responsibility for the amounts to the defendants and both
    causes of action were alleged against both defendants. 
    2016 WL 844819
    , at *12. Similarly here, Does 1 and 2’s
    complaint raised four causes of action against all four
    defendants, and the fifth cause of action against only
    unknown doe defendants. Doe 3’s complaint brought all
    claims against all defendants.         The three settlement
    agreements released the District and the Administrators from
    liability and did not differentiate among the defendants.
    Given the blended pleadings and wording of the settlement
    agreements, the district court did not abuse its discretion in
    allocating the liability equally among the District and the
    three Administrators. 6
    6
    California Casualty argues that it was not the primary insurer,
    unlike the insurer in Great American, and therefore the four defendants
    should not share liability evenly. However, the Great American court’s
    WESTPORT INS. V. CALIF. CASUALTY MGMT.                          17
    B. Westport’s Contribution
    California Casualty challenges the district court’s
    finding that Westport only needed to pay $1 million per
    occurrence instead of $1 million per occurrence per insured,
    totaling $3 million.     We find California Casualty’s
    arguments to be without merit.
    Although California Casualty’s policy and Westport’s
    Primary policy define “occurrence” similarly, they differ on
    how they cover liability per occurrence. Westport’s Primary
    policy defines an occurrence as “an accident, including
    continuous or repeated exposure to conditions, which . . .
    results in injury, or damages to which this insurance
    applies.” California Casualty’s policy defines an occurrence
    as “an event, including injurious exposure to conditions,
    which results in injuries and/or damage to one or more
    persons or legal entities . . . . An occurrence can involve a
    single sudden event or the continuous or repeated injurious
    exposure to conditions.” The district court held that, because
    under California Casualty’s policy each Administrator is an
    insured, California Casualty was required to pay $150,000
    per Administrator per occurrence per student for each policy
    period. Conversely, Westport’s Primary policy contains a
    clause that states the policy applies to each separate insured,
    but “nothing herein shall operate to increase the Company’s
    liability . . . beyond the amount or amounts for which the
    Company would have been liable if only one person or
    interest had been named as insured.” Thus, the district court
    division of liability between co-defendants did not turn on the status of
    the insurance companies, but rather on the pleadings and settlement
    agreements. Great American, 
    2016 WL 844819
    , at *12. In fact, in terms
    of actual monetary liability, the court ordered the co-primary insurer to
    pay its $1 million limit, not half of the total $3 million settlement, despite
    its insured being apportioned “equal” liability. 
    Id. at *13
    .
    18      WESTPORT INS. V. CALIF. CASUALTY MGMT.
    held that under Westport’s Primary policy, Westport was
    required to cover $1 million per occurrence per student for
    each policy period, but not per administrator.
    California Casualty does not now challenge the district
    court’s decision that, under its policy, each “occurrence”
    requires coverage per student per administrator for each
    policy period. Instead, California Casualty now contends
    that if each occurrence is so defined, then Westport should
    have been required to pay $3 million per policy period
    because there were three Administrators, in the same manner
    the district court ordered California Casualty to pay up to
    $450,000 per policy period. This argument is unavailing.
    As noted, Westport’s Primary policy contains a
    provision explaining that although its policy insures each
    individual employee separately, if multiple insureds are
    named, the policy operates to limit liability as “if only one
    person . . . had been named as insured.” This provision
    clearly limits Westport’s liability in the present situation
    wherein multiple insureds—three Administrators and the
    District—all allegedly failed to supervise the teacher.
    California Casualty’s policy contains no such limitation
    clause.
    C. California Casualty’s Contribution
    California Casualty next contends that its own obligation
    does not arise until $1 million is paid per insured regardless
    of the source—the Westport Primary policy, any other
    policy, or through self-insurance. California Casualty’s
    policy defines “the insured” as “a member of the Association
    of California School Administrators who is employed by a
    school board, board of trustees or similar governing body of
    an educational unit.” According to California Casualty,
    Westport only paid $333,333.333 per each insured;
    WESTPORT INS. V. CALIF. CASUALTY MGMT.             19
    therefore, California Casualty’s policy does not trigger under
    its terms until some entity pays $1 million per insured.
    Keeping in mind that under California law insurance
    coverage is to be construed broadly, we find Westport’s
    payment of $1 million per period did trigger California
    Casualty’s policy.
    First, California Casualty’s policy text does not support
    its interpretation of when its policy is triggered. California
    Casualty's policy states:
    At the time of an occurrence there must be
    underlying primary collectible insurance or
    self-insurance available to the insured . . .
    with a minimum per occurrence limit of
    $1,000,000.00. There shall be no insurance
    afforded under this policy until the required
    $1 million limit of liability afforded the
    insured by such other insurance or self-
    insurance is exhausted. (Emphasis added).
    The phrase “such other insurance” is an antecedent phrase
    referring back to the previous sentence, which defines the
    requisite primary insurance as insurance “with a minimum
    per occurrence limit of $1,000,000.” Although California
    Casualty’s policy denotes a per occurrence limit, it does not
    require that the $1 million limit in the primary policy must
    also apply per insured, as California Casualty now suggests
    it should. See State Farm Mut. Auto Ins. Co. v. Partridge,
    
    514 P.2d 123
    , (Cal. 1973) (holding “all ambiguities in an
    insurance policy are construed against the insurer-
    draftsman”).
    Furthermore, the Administrators complied with the
    written requirements of California Casualty’s policy in
    obtaining their primary policy. The California Casualty
    20      WESTPORT INS. V. CALIF. CASUALTY MGMT.
    policy requires primary collectible insurance with a
    “minimum per occurrence limit of $1 million” be available
    to the insured pursuant to the Education Code or other
    provisions governing insurance for public entities.
    Westport’s Primary policy was issued pursuant to the
    Education Code provisions explicitly mentioned in
    California Casualty’s policy and provided a per occurrence
    limit of $1 million. Therefore, each Administrator had the
    requisite $1 million of primary insurance available to him.
    Second, California Casualty’s policy only requires that
    this underlying insurance of $1 million “afforded the insured
    by such other insurance or self-insurance is exhausted.” This
    language does not clearly require that $1 million be
    exhausted per insured or even for the same occurrence, just
    that it be exhausted. Westport’s Primary policy covering
    $1 million was exhausted according to its terms. To
    interpret California Casualty’s policy to require its insureds
    to obtain additional insurance in the event their primary
    insurance exhausts prior to reaching the $1 million
    contribution would create yet another potential layer of
    insurance coverage that is not required by the policy itself.
    On its face, California Casualty’s policy requires only the
    exhaustion of the underlying $1 million primary insurance
    before California Casualty’s coverage begins. That occurred
    here.
    Imagine a hypothetical scenario wherein a prior
    settlement or series of settlements exhausts Westport’s
    primary insurance up to its annual aggregate limit of
    $3 million rendering Westport’s primary policy unable to
    contribute to the $1 million of underlying insurance required
    by California Casualty’s policy. If California Casualty’s
    interpretation of its policy were correct, California Casualty
    would then provide zero coverage—because the $1 million
    WESTPORT INS. V. CALIF. CASUALTY MGMT.               21
    per insured was not reached—contrary to its policy language
    that it pays all damages in excess of the required underlying
    insurance. This hypothetical illustrates the untenable
    position California Casualty advances.
    Given that insurance exclusions must be “interpreted
    narrowly against the insurer,” TRB Invs., 145 P.3d at 477,
    we construe the ambiguity of California Casualty’s policy
    against it and in favor of its insureds. In sum, we hold that
    California Casualty’s policy coverage began upon
    exhaustion of Westport’s Primary policy when Westport
    paid $1 million per policy period per student.
    D. Proration of the Policies
    California Casualty also contends that its coverage
    should prorate with Westport’s coverage. A pro rata clause
    “provides that if there is other valid and collectible
    insurance, then the insurer shall not be liable for more than
    his pro rata share of the loss.” Olympic Ins. Co. v. Emp’rs
    Surplus Lines Ins. Co., 
    178 Cal. Rptr. 908
    , 911 (Ct. App.
    1981). California courts tend to prorate the loss among co-
    insurers with conflicting excess clauses. 
    Id.
     This situation
    often occurs when both insurers on the same level have
    excess clauses that deem the policy excess to other valid and
    collectible insurance. See 
    id. at 912
     (prorating two primary
    insurers’ policies where both purported to be excess to the
    other).
    The text of the insurance policies in this case belies
    California Casualty’s claim that they prorate. California
    Casualty’s policy plainly states that it “shall not be construed
    to be pro rata, concurrent or contributing with any other
    insurance or self-insurance which is available to the
    Insured.” Further, California Casualty’s policy does not
    occupy the same level of insurance coverage as either of
    22      WESTPORT INS. V. CALIF. CASUALTY MGMT.
    Westport’s policies. As discussed, the exhaustion of
    Westport’s Primary policy triggers liability under California
    Casualty’s policy. Only when California Casualty’s policy
    is exhausted does Westport’s Excess policy become liable.
    Westport’s Excess policy clearly states, “If there is any other
    collectible insurance available to the insured that covers a
    loss that is also covered by this policy, the insurance
    provided by this policy will apply in excess of other
    collectible insurance.” Accordingly, California Casualty’s
    policy is sandwiched between Westport’s Primary and
    Excess policies. There is no conflict between California
    Casualty’s policy and either of Westport’s policies such that
    they should prorate.
    IV.    Prejudgment Interest
    California Casualty asserts that the district court should
    have awarded prejudgment interest at seven percent, running
    from July 11, 2014—the date of Westport’s first demand
    letter for payment. The district court awarded prejudgment
    interest at ten percent, running from the dates Westport paid
    each of the Settlements. We find no abuse of discretion in
    the district court’s determination to award prejudgment
    interest at ten percent from the dates Westport paid the
    Settlements.
    State law governs prejudgment interest in a diversity
    action. U.S. Fid. & Guar. Co. v. Lee Invs. LLC, 
    641 F.3d 1126
    , 1139 (9th Cir. 2011). The California Constitution
    generally affixes the rate of prejudgment interest at seven
    percent per annum for judgments rendered in state courts
    unless specified otherwise by the legislature. Cal. Const.
    Art. 15, § 1. However, the California Civil Code sets
    prejudgment interest on contract actions at ten percent per
    annum if the rate is not otherwise stipulated in the contract.
    
    Cal. Civ. Code § 3289
    . California Casualty argues that
    WESTPORT INS. V. CALIF. CASUALTY MGMT.              23
    because Westport labeled its cause of action “equitable
    contribution,” which is not a contract action, Westport
    should only receive prejudgment interest at the rate of seven
    percent. Westport counters that the district court correctly
    determined that despite the characterization, its action was
    one for equitable subrogation, which sounds in contract, and
    that the district court properly awarded prejudgment interest
    at ten percent.
    The California Court of Appeal explained the difference
    between equitable contribution and equitable subrogation in
    Fireman’s Fund Insurance Co. v. Maryland Casualty Co.,
    
    77 Cal. Rptr. 2d 296
     (Ct. App. 1998). Equitable subrogation
    puts the insurer in the position of the insured “to pursue
    recovery from third parties legally responsible to the insured
    for a loss which the insurer has both insured and paid.”
    Fireman’s Fund, 77 Cal. Rptr. 2d at 302. In contrast,
    equitable contribution is to “apportion a loss between two or
    more insurers who cover the same risk, so that each pays its
    fair share and one does not profit at the expense of the
    others.” Id. at 306.
    These definitions clarify that Westport incorrectly
    labeled its cause of action as one for “equitable
    contribution.” See K.C. Multimedia, Inc. v. Bank of Am.
    Tech. & Operations, Inc., 
    90 Cal. Rptr. 3d 247
    , 261 (Ct. App.
    2009) (holding the facts, not the labels, in a pleading
    determine whether a plaintiff is entitled to relief). We do not
    interpret California Casualty’s policy and Westport’s Excess
    policy to “cover the same risk.” Instead, these two excess
    policies create stratified levels of coverage within the excess
    layer. Accordingly, the district court did not abuse its
    discretion in holding that notwithstanding the erroneous title
    for its claim, Westport’s action is one for equitable
    subrogation and entitled to ten percent prejudgment interest.
    24      WESTPORT INS. V. CALIF. CASUALTY MGMT.
    We similarly find meritless California Casualty’s
    argument regarding the date from which the prejudgment
    interest should run. California Civil Code § 3287(a) states
    in pertinent part:
    Every person who is entitled to recover
    damages certain, or capable of being made
    certain by calculation, and the right to recover
    which is vested in him upon a particular day,
    is entitled also to recover interest thereon
    from that day, except during such time as the
    debtor is prevented by law, or by the act of
    the creditor from paying the debt . . . .
    
    Cal. Civ. Code § 3287
    (a). The test for recovery under this
    provision is “whether [the] defendant actually knows the
    amount owed or from reasonably available information
    could the defendant have computed that amount.”
    Children’s Hosp. & Med. Ctr. v. Bonta, 
    118 Cal. Rptr. 2d 629
    , 654 (Ct. App. 2002). When the allocation of liability
    turns on factual issues, damages are uncertain; however,
    when the allocation turns exclusively on legal issues,
    damages are certain and interest is available. State v. Cont’l
    Ins. Co., 
    223 Cal. Rptr. 3d 716
    , 735 (Ct. App. 2017). Where
    the challenge concerns the interpretation of the relevant
    policy language, the parties present a pure legal question. 
    Id. at 736
    .
    California Casualty asserts that California’s mediation
    privilege prevents disclosure of Westport’s letters it received
    on May 30, 2014, June 10, 2014, and October 9, 2014, and
    of the settlement agreements themselves, and, therefore, that
    damages did not become certain until July 11, 2014, , as
    opposed to July 29, 2013 and June 26, 2014.
    WESTPORT INS. V. CALIF. CASUALTY MGMT.                         25
    California’s mediation privilege prohibits any writing
    “prepared for the purpose of, in the course of, or pursuant to,
    a mediation or mediation consultation” to be admissible in
    any civil action in which testimony can be compelled to be
    given.” 
    Cal. Evid. Code § 1119
    (b). In addition, “all
    communications . . . by and between participants in the
    course of a mediation” shall remain confidential. 
    Cal. Evid. Code § 1119
    (c). While the district court erred in overruling
    California Casualty’s objection to the disclosure of these
    letters, 7 though not to the settlement agreements, 8 this error
    does not affect resolution of this issue, because the damages
    were certain on the Settlements’ payment dates regardless of
    the admissibility of the demand letters.
    In Continental Insurance, the court rejected the insurer’s
    argument that damages were uncertain because the
    companies disputed the number of covered occurrences.
    223 Cal. Rptr. at 737. The court determined that this dispute
    7
    The district court overruled the objection pertaining to the letters,
    finding that because they were between California Casualty’s corporate
    representative and attorney and Westport’s attorney, they were not
    between the “disputants in the mediation.” The district court defined the
    disputants solely as the Does, the District, and the Administrators.
    However, the mediation privilege “extends beyond discussions carried
    out directly between the opposing parties to the dispute, or with the
    mediator, or during the mediation proceedings themselves” to “all oral
    or written communications . . . made for the purpose of or pursuant to a
    mediation.” Cassel v. Super. Ct., 
    244 P.3d 1000
    , 1084 (Cal. 2011). The
    letters concerned Westport’s possibility of settling beyond its primary
    limits during the mediation. Accordingly, they fall within the mediation
    privilege under California law.
    8
    See In re Marriage of Daly & Oyster, 
    175 Cal. Rptr. 3d 364
    , 368
    (Ct. App. 2014) (explaining that, under 
    Cal. Evid. Code § 1123
    , the
    mediation privilege does not cover signed written settlement agreements
    produced during mediation when the agreement contains terms
    signifying the parties’ intent to be bound by it).
    26      WESTPORT INS. V. CALIF. CASUALTY MGMT.
    posed a question of liability that did not affect the certainty
    of damages. 
    Id.
     The appellate court then upheld the trial
    court’s award of mandatory prejudgment interest from the
    date of judgment. 
    Id. at 720
    .
    The present case also concerns the interpretation and
    prioritization of the insurance policies at issue—all legal
    questions. Accordingly, California Casualty is liable for
    prejudgment interest from the “date of settlement because
    that is the date that the loss is certain or capable of being
    made certain by calculation.” 
    Id. at 735
    . We hold that the
    district court did not abuse its discretion in awarding
    prejudgment interest from the dates on which Westport paid
    the Settlements—July 29, 2013, and June 26, 2014. See
    Highlands Ins. Co. v. Cont’l Cas. Co., 
    64 F.3d 514
    , 522 (9th
    Cir. 1995) (finding no abuse of discretion for prejudgment
    interest to begin running on the insurer’s date of payment
    rather than the date of its complaint for reimbursement). On
    these dates, Westport’s primary layer of coverage was
    exhausted, and Westport overpaid on its Excess policy due
    to California Casualty’s failure to provide its coverage.
    CONCLUSION
    We hold that California Government Code Section 825.4
    does not preclude Westport’s lawsuit against California
    Casualty, and we affirm the district court’s decision on all
    the remaining issues raised on appeal.
    AFFIRMED.