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Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Fixed maturities    
Available-for-sale securities disclosures    
Amortized cost $ 56,388.7 $ 53,184.2
Gross unrealized gains 3,010.4 2,310.7
Gross unrealized losses 261.3 648.8
Fair value 59,137.8 54,846.1
Other-than-temporary impairments in AOCI 113.9 146.4
Net unrealized gains (losses) on impaired fixed maturities, available-for-sale related to changes in fair value subsequent to the impairment date 120.1 120.9
U.S. government and agencies    
Available-for-sale securities disclosures    
Amortized cost 1,427.3 1,426.7
Gross unrealized gains 37.4 17.2
Gross unrealized losses 7.0 10.9
Fair value 1,457.7 1,433.0
Non-U.S. governments    
Available-for-sale securities disclosures    
Amortized cost 932.0 781.7
Gross unrealized gains 141.3 119.3
Gross unrealized losses 2.0 7.4
Fair value 1,071.3 893.6
States and political subdivisions    
Available-for-sale securities disclosures    
Amortized cost 6,354.6 5,463.9
Gross unrealized gains 322.8 192.4
Gross unrealized losses 21.8 87.1
Fair value 6,655.6 5,569.2
Other-than-temporary impairments in AOCI   1.1
Corporate debt securities    
Available-for-sale securities disclosures    
Amortized cost 34,660.1 32,699.7
Gross unrealized gains 2,357.1 1,843.5
Gross unrealized losses 128.9 350.8
Fair value 36,888.3 34,192.4
Other-than-temporary impairments in AOCI 9.4 17.2
Residential mortgage-backed pass-through securities    
Available-for-sale securities disclosures    
Amortized cost 2,591.0 2,798.0
Gross unrealized gains 63.7 67.3
Gross unrealized losses 16.8 30.6
Fair value 2,637.9 2,834.7
Commercial mortgage-backed securities    
Available-for-sale securities disclosures    
Amortized cost 3,761.3 4,153.2
Gross unrealized gains 34.0 31.2
Gross unrealized losses 45.8 87.9
Fair value 3,749.5 4,096.5
Other-than-temporary impairments in AOCI 58.5 77.5
Collateralized debt obligations    
Available-for-sale securities disclosures    
Amortized cost 1,249.3 780.1
Gross unrealized gains 3.2 2.8
Gross unrealized losses 13.3 24.3
Fair value 1,239.2 758.6
Other-than-temporary impairments in AOCI 0.3 0.3
Other debt obligations    
Available-for-sale securities disclosures    
Amortized cost 5,413.1 5,080.9
Gross unrealized gains 50.9 37.0
Gross unrealized losses 25.7 49.8
Fair value 5,438.3 5,068.1
Other-than-temporary impairments in AOCI 45.7 50.3
Equity securities    
Available-for-sale securities disclosures    
Amortized cost 117.4 104.9
Gross unrealized gains 7.2 4.9
Gross unrealized losses 6.3 10.9
Fair value $ 118.3 $ 98.9