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Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Fixed maturities    
Available-for-sale securities disclosures    
Amortized cost $ 58,505.1 $ 56,562.1
Gross unrealized gains 1,811.2 3,093.3
Gross unrealized losses 1,004.6 267.0
Fair value 59,311.7 59,388.4
Other-than-temporary impairments in AOCI 81.3 93.3
Net unrealized gains (losses) on impaired fixed maturities, available-for-sale related to changes in fair value subsequent to the impairment date 92.2 103.0
U.S. government and agencies    
Available-for-sale securities disclosures    
Amortized cost 1,348.9 1,314.5
Gross unrealized gains 15.8 44.9
Gross unrealized losses 21.4 7.7
Fair value 1,343.3 1,351.7
Non-U.S. governments    
Available-for-sale securities disclosures    
Amortized cost 1,047.0 820.5
Gross unrealized gains 106.1 84.6
Gross unrealized losses 16.8 3.6
Fair value 1,136.3 901.5
States and political subdivisions    
Available-for-sale securities disclosures    
Amortized cost 6,256.6 6,446.1
Gross unrealized gains 221.4 371.4
Gross unrealized losses 67.0 15.9
Fair value 6,411.0 6,801.6
Corporate debt securities    
Available-for-sale securities disclosures    
Amortized cost 35,369.0 34,673.0
Gross unrealized gains 1,398.0 2,464.2
Gross unrealized losses 622.8 104.1
Fair value 36,144.2 37,033.1
Other-than-temporary impairments in AOCI 0.8 0.5
Residential mortgage-backed pass-through securities    
Available-for-sale securities disclosures    
Amortized cost 2,407.8 2,493.8
Gross unrealized gains 25.2 50.8
Gross unrealized losses 60.6 21.3
Fair value 2,372.4 2,523.3
Commercial mortgage-backed securities    
Available-for-sale securities disclosures    
Amortized cost 3,935.9 3,734.0
Gross unrealized gains 18.1 32.7
Gross unrealized losses 97.5 58.4
Fair value 3,856.5 3,708.3
Other-than-temporary impairments in AOCI 40.6 50.6
Collateralized debt obligations    
Available-for-sale securities disclosures    
Amortized cost 1,812.5 1,372.1
Gross unrealized gains 0.4 2.7
Gross unrealized losses 14.8 15.5
Fair value 1,798.1 1,359.3
Other-than-temporary impairments in AOCI 0.6 0.3
Other debt obligations    
Available-for-sale securities disclosures    
Amortized cost 6,327.4 5,708.1
Gross unrealized gains 26.2 42.0
Gross unrealized losses 103.7 40.5
Fair value 6,249.9 5,709.6
Other-than-temporary impairments in AOCI $ 39.3 41.9
Equity securities    
Available-for-sale securities disclosures    
Amortized cost   94.0
Gross unrealized gains   7.4
Gross unrealized losses   5.4
Fair value   $ 96.0