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Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Fixed maturities    
Available-for-sale securities disclosures    
Amortized cost $ 50,840.4 $ 48,674.3
Gross unrealized gains 2,835.5 2,115.4
Gross unrealized losses 630.5 823.2
Fair value 53,045.4 49,966.5
Other-than-temporary impairments in AOCI 153.6 146.1
Net unrealized gains (losses) on impaired fixed maturities, available-for-sale related to changes in fair value subsequent to the impairment date 118.1 131.5
U.S. government and agencies    
Available-for-sale securities disclosures    
Amortized cost 1,561.7 1,488.4
Gross unrealized gains 60.8 23.4
Gross unrealized losses 0.7 8.3
Fair value 1,621.8 1,503.5
Non-U.S. governments    
Available-for-sale securities disclosures    
Amortized cost 734.4 669.8
Gross unrealized gains 153.7 128.5
Gross unrealized losses 1.6 5.0
Fair value 886.5 793.3
States and political subdivisions    
Available-for-sale securities disclosures    
Amortized cost 4,811.4 4,501.8
Gross unrealized gains 340.7 234.7
Gross unrealized losses 2.8 19.4
Fair value 5,149.3 4,717.1
Corporate debt securities    
Available-for-sale securities disclosures    
Amortized cost 31,574.1 30,245.5
Gross unrealized gains 2,038.5 1,532.9
Gross unrealized losses 480.0 638.2
Fair value 33,132.6 31,140.2
Other-than-temporary impairments in AOCI 16.0 5.9
Residential mortgage-backed pass-through securities    
Available-for-sale securities disclosures    
Amortized cost 2,516.4 2,549.4
Gross unrealized gains 113.1 90.0
Gross unrealized losses 1.9 11.9
Fair value 2,627.6 2,627.5
Commercial mortgage-backed securities    
Available-for-sale securities disclosures    
Amortized cost 4,194.2 3,932.5
Gross unrealized gains 64.5 65.3
Gross unrealized losses 79.1 78.0
Fair value 4,179.6 3,919.8
Other-than-temporary impairments in AOCI 80.5 80.7
Collateralized debt obligations    
Available-for-sale securities disclosures    
Amortized cost 783.5 692.7
Gross unrealized gains 0.4 1.4
Gross unrealized losses 31.9 26.6
Fair value 752.0 667.5
Other-than-temporary impairments in AOCI 1.0 1.3
Other debt obligations    
Available-for-sale securities disclosures    
Amortized cost 4,664.7 4,594.2
Gross unrealized gains 63.8 39.2
Gross unrealized losses 32.5 35.8
Fair value 4,696.0 4,597.6
Other-than-temporary impairments in AOCI 56.1 58.2
Equity securities    
Available-for-sale securities disclosures    
Amortized cost 111.2 111.2
Gross unrealized gains 7.6 7.5
Gross unrealized losses 15.1 14.2
Fair value $ 103.7 $ 104.5