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Investments (Details 6) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other-Than-Temporary Impairment Credit Losses Recognized in Net Income - Rollforward      
Beginning balance $ (325.7) $ (204.7) $ (18.5)
Credit losses for which an other-than-temporary impairment was not previously recognized (37.8) (112.4) (168.5)
Credit losses for which an other-than-temporary impairment was previously recognized (135.6) (109.7) (52.7)
Reduction for credit losses previously recognized on fixed maturities now sold or intended to be sold 68.2 53.2 33.4
Reduction for credit losses previously recognized on fixed maturities reclassified to trading   44.4  
Net reduction (increase) for positive changes in cash flows expected to be collected and amortization (3.9) 3.5 1.6
Ending balance $ (434.8) $ (325.7) $ (204.7)