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Investments (Details 4) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Other-than-temporary impairment losses, net of recoveries        
Total other-than-temporary impairment losses on available-for-sale securities $ (43.6) $ (12.7) $ (126.4) $ (67.6)
Other-than-temporary impairment losses on fixed maturities, available-for-sale reclassified to (from) other comprehensive income 9.2 (34.9) 31.2 (83.0)
Net impairment losses on available-for-sale securities (34.4) (47.6) (95.2) (150.6)
Fixed maturities
       
Other-than-temporary impairment losses, net of recoveries        
Total other-than-temporary impairment losses on available-for-sale securities (43.5) (12.8) (126.3) (65.4)
Equity securities
       
Other-than-temporary impairment losses, net of recoveries        
Total other-than-temporary impairment losses on available-for-sale securities $ (0.1) $ 0.1 $ (0.1) $ (2.2)