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Supplemental Information Concerning Property and Casualty Insurance Operations (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Reserves for losses and loss adjustment expenses	$ 2,074.3	$ 1,931.8	$ 1,115.5
Prepaid premiums, gross	$ 275.4	$ 234.9	$ 77.0

Alternate concept name for the aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies.

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