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Legal Update

When Reinsurance May Not be "Back to Back" - Wasa v Lexington

19 October 2009
Mayer Brown JSM Legal Update

The Facts

Lexington issued an "All Risks Difference in Conditions" Property Damage Insurance Policy (the "Policy") to the Aluminium Company of America ("ALCOA") for the period 1 July 1977 to 1 July 1980.

The Policy was not subject to an express choice of law provision but contained a US Service of Suit clause, requiring Lexington, at the request of ALCOA, to "submit to the jurisdiction of any Court of Competent Jurisdiction within the US".

Lexington reinsured the risk covered under the Policy under a proportional facultative reinsurance contract (the "Reinsurance Contract"). The Reinsurance Contract, like the Policy, was for the period 1 July 1977 to 1 July 1980. It contained the following full reinsurance and follow the settlements wording: "Being a reinsurance of and warranted same gross rate, terms and conditions as and to follow the settlements of the Company... ".

The parties agreed that the Reinsurance Contract was subject to an implied choice of English law.

In the early 1990s, ALCOA was required by the US Environmental Protection Agency to clean up pollution and contamination at various manufacturing sites used by ALCOA.

ALCOA sought to recover the costs from its insurers, including Lexington, with which ALCOA had cover in the period during which the damage had occurred - some fifty years dating back to 1942. ALCOA issued proceedings against these insurers in the State of Washington. The trial court in Washington found that the damage in respect of which ALCOA sought an indemnity had accrued over many years, including between 1977 and 1980. Therefore, the question arose of how the loss should be allocated between the different insurers and years of cover.

The trial court held that the law applicable to determining coverage was the law of Pennsylvania. The trial court further held that the loss could be allocated pro rata by dividing the total cost by the number of years during which the damage had accrued. Allocated in this way, the loss for which Lexington was held liable was only a small percentage of the total loss.

ALCOA appealed against the trial court's decision. On appeal, the Supreme Court of Washington held that the Insuring Clause of the Policy (in common with policies issued by other defendant insurers) covered losses arising from damage that had occurred before inception and during the policy period, provided only that the loss was "manifest" during the policy period. On this basis, the Supreme Court found the insurers, including Lexington, to be jointly and severally liable for the total loss suffered by ALCOA.

Facing a claim of some US$180 million, Lexington settled for just over US$103 million and sought to recover from its reinsurers. One of the reinsurers, Wasa, issued proceedings in the Commercial Court for a declaration that they were not liable on the basis that the Reinsurance Contract was governed by English law and, as a matter of English law, only covered losses occurring from 1 July 1977 to 1 July 1980. A large proportion of the loss in respect of which Lexington had been held liable, and to which the settlement of ALCOA's claim related, had occurred before this period and therefore did not, on Wasa's view, fall for cover under the Reinsurance Contract.

At first instance, Simon J found in favour of Wasa. This decision was overturned by the Court of Appeal, the decision of which was the subject of the appeal before the House of Lords.

The House of Lords' Decision

The House of Lords (the leading judgment was given by Lord Collins) approached the issues raised by the appeal by recognising that the risk covered by a contract of proportional reinsurance will usually be co-extensive with the risk covered by the underlying insurance contract (absent any express indication to the contrary). This being the case, it may be assumed that the intention of the parties will be that wording of the reinsurance contract is to be interpreted as "back-to-back" with the insurance contract. However, a reinsurance contract is independent of the underlying insurance contract and liability under a reinsurance contract will therefore only arise in respect of risks falling within the cover created by the reinsurance. The position in this regard is not changed by follow the settlements wording. Therefore, Wasa could only be liable to Lexington if the loss in respect of which Lexington sought an indemnity fell within the cover created by the Reinsurance Contract.

In support of their position, Lexington relied on the decisions in Vesta v Butcher (1989) and Groupama v Catatumbo (2000). These decisions are authorities for the principle that, if a reinsurance contract and the underlying insurance contract are governed by different laws, the terms incorporated from the insurance contract into the reinsurance contract shall have the same meaning and effect as in the insurance contract.

The House of Lords considered that these cases only supported a principle of construction, to be applied only after taking into account all the relevant circumstances of the reinsurance. One key factor that distinguished the circumstances of Wasa from those of Vesta v Butcher and Groupama v Catatumbo was that, at the time the reinsurance contracts of concern in these earlier cases were entered into, the law by which each insurance contract was governed was readily ascertainable and would have been in the contemplation of the parties. By contrast, the Lexington Policy was not subject to an express choice of law. However, it was subject to a US Service of Suit clause and the property insured was located in a variety of different US (and non-US) jurisdictions. For these reasons, the House of Lords did not consider that the parties, at the time the Reinsurance Contract was entered into, could have ascertained under which law coverage under the Policy would be determined. Therefore, the reinsurers could not consult what was referred to in Vesta v. Butcher as a notional "foreign legal dictionary" to interpret the Reinsurance Contract in a manner differently from its ordinary meaning under English law.

The House of Lords rejected the suggestion that, because the Washington court had found that Pennsylvanian law applied in relation to coverage, this must, all along, have been the law applicable to determining questions of coverage. The basis for the House of Lords conclusion in this regard was that the Washington court's decision to apply Pennsylvanian law in relation to coverage had been driven by the requirement to adopt a law for this purpose that had a common connection with all the parties and sites involved in the litigation, which included many insurers other than Lexington and many jurisdictions. The Washington Court's decision to apply the law of Pennsylvania had been taken by reference to factors extraneous to the Policy.


The House of Lords ruling limits the application of the principle that, in relation to facultative contracts of reinsurance that are not governed by the same law as the underlying insurance, terms that the reinsurance incorporates from the underlying insurance are to be given the same meaning and effect as under the law by which the insurance is governed. According to Wasa, this principle will not apply if, at the time the reinsurance contract is entered into, the law by which the insurance contract is governed is not identifiable or ascertainable. This is because the reinsurer has no "foreign legal dictionary" to consult.

It is worthwhile to note that the House of Lords ruling still leaves a number of questions unanswered. For example, the Law Lords were not asked to rule on the fundamental question of whether the subject matter of the reinsurance is the insurers' liability, not the primary risk. Lord Collins had recognized in his judgment that in commercial reality, reinsurance is liability insurance which provides cover for the reinsured in the event that it is liable to pay the original insured. However, he noted how his view would be a departure from the common law position and would have regulatory consequences. As the Hong Kong court has traditionally relied on the English authorities on this area, this uncertainty arising from the decision would no doubt be something that reinsureds and reinsurers alike would have to take note of.

Also in the Hong Kong context, this decision of the House of Lords tallies with the emphasis of the Hong Kong court in Robin Hargreaves v Taian Insurance Co. Ltd (2006) on the importance of stipulating a choice of law in insurance contracts. Where a choice of law is not specified, uncertainty in the contracts may arise and this may lead to invalid risk transfer. Contractual certainty is especially important in the Hong Kong reinsurance market given insurers are required under the Insurance Companies Ordinance (Cap. 41) to maintain adequate reinsurance arrangements in force for each class of insurance business they carry on. To ensure contractual certainty, reinsureds could either ensure that the insurance or reinsurance contracts are subject to the same governing law, or negotiate for a clause which binds the reinsurer to provide indemnity regardless of what the local law provides or how that law would be applied by a local court. This would make it more likely that the insurance and reinsurance will be considered back-to-back.

For inquiries related to this Client Alert, please contact:

Angela Yim ( )

TL Lim ( )

Learn more about our Hong Kong office and Insurance & Reinsurance practice.


  • Angela S. Y. Yim
    T +852 2843 4503
  • Tow Lu Lim
    T +852 2843 4490

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