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Debt Securities Held for which Other-Than-Temporary Impairment Loss has been Recognized in Current Period or Previously (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
OtherThanTemporary Impairment Non Credit Losses Recognized In Earnings [Line Items]    
Fair Value $ 51.5 $ 73.6
Amortized Cost Basis 59.0 96.8
Noncredit-related Losses Recognized in OCI (7.5) (23.2)
Tax Effect 2.8 8.6
Amount Recognized in OCI $ (4.7) $ (14.6)