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Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Fixed maturities    
Available-for-sale securities disclosures    
Amortized cost $ 55,171.8 $ 53,184.2
Gross unrealized gains 2,934.6 2,310.7
Gross unrealized losses 306.6 648.8
Fair value 57,799.8 54,846.1
Other-than-temporary impairments in AOCI 133.1 146.4
Net unrealized gains (losses) on impaired fixed maturities, available-for-sale related to changes in fair value subsequent to the impairment date 127.1 120.9
U.S. government and agencies    
Available-for-sale securities disclosures    
Amortized cost 1,389.9 1,426.7
Gross unrealized gains 37.6 17.2
Gross unrealized losses 7.2 10.9
Fair value 1,420.3 1,433.0
Non-U.S. governments    
Available-for-sale securities disclosures    
Amortized cost 907.1 781.7
Gross unrealized gains 138.5 119.3
Gross unrealized losses 2.4 7.4
Fair value 1,043.2 893.6
States and political subdivisions    
Available-for-sale securities disclosures    
Amortized cost 6,098.3 5,463.9
Gross unrealized gains 300.3 192.4
Gross unrealized losses 29.2 87.1
Fair value 6,369.4 5,569.2
Other-than-temporary impairments in AOCI   1.1
Corporate debt securities    
Available-for-sale securities disclosures    
Amortized cost 33,814.1 32,699.7
Gross unrealized gains 2,305.4 1,843.5
Gross unrealized losses 148.7 350.8
Fair value 35,970.8 34,192.4
Other-than-temporary impairments in AOCI 16.8 17.2
Residential mortgage-backed pass-through securities    
Available-for-sale securities disclosures    
Amortized cost 2,704.7 2,798.0
Gross unrealized gains 63.7 67.3
Gross unrealized losses 22.4 30.6
Fair value 2,746.0 2,834.7
Commercial mortgage-backed securities    
Available-for-sale securities disclosures    
Amortized cost 3,830.9 4,153.2
Gross unrealized gains 36.9 31.2
Gross unrealized losses 49.9 87.9
Fair value 3,817.9 4,096.5
Other-than-temporary impairments in AOCI 69.0 77.5
Collateralized debt obligations    
Available-for-sale securities disclosures    
Amortized cost 1,219.0 780.1
Gross unrealized gains 2.4 2.8
Gross unrealized losses 17.6 24.3
Fair value 1,203.8 758.6
Other-than-temporary impairments in AOCI 0.3 0.3
Other debt obligations    
Available-for-sale securities disclosures    
Amortized cost 5,207.8 5,080.9
Gross unrealized gains 49.8 37.0
Gross unrealized losses 29.2 49.8
Fair value 5,228.4 5,068.1
Other-than-temporary impairments in AOCI 47.0 50.3
Equity securities    
Available-for-sale securities disclosures    
Amortized cost 103.5 104.9
Gross unrealized gains 7.3 4.9
Gross unrealized losses 7.1 10.9
Fair value $ 103.7 $ 98.9