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Combined Statutory Capital and Surplus (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
United States Traditional Insurance Subsidiaries [Member]
Statutory Accounting Practices [Line Items]
Statutory Combined Capital and Surplus	$ 3,426.5	$ 3,461.3
Tailwind Re and Northwind Re Subsidiaries [Member]
Statutory Accounting Practices [Line Items]
Statutory Combined Capital and Surplus	$ 1,188.4	$ 1,226.5

The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

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