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Combined Statutory Capital and Surplus (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
United States Traditional Insurance Subsidiaries [Member]
   
Statutory Accounting Practices [Line Items]    
Statutory Combined Capital and Surplus $ 3,461.3 $ 3,395.1
Tailwind Re and Northwind Re Subsidiaries [Member]
   
Statutory Accounting Practices [Line Items]    
Statutory Combined Capital and Surplus $ 1,226.5 $ 1,276.9