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Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Available-for-sale securities    
Amortized cost, fixed maturities $ 61,270.4 $ 59,725.8
Gross unrealized gains, fixed maturities 4,148.9 1,612.4
Gross unrealized losses, fixed maturities 151.2 1,229.7
Fair value, fixed maturities 65,268.1 60,108.5
Other-than-temporary impairments in AOCI 56.1 53.6
Net unrealized gains (losses) on impaired fixed maturities, available-for-sale related to changes in fair value subsequent to the impairment date 70.0 64.2
U.S. government and agencies    
Available-for-sale securities    
Amortized cost, fixed maturities 1,457.4 1,441.6
Gross unrealized gains, fixed maturities 82.9 16.4
Gross unrealized losses, fixed maturities 3.9 17.0
Fair value, fixed maturities 1,536.4 1,441.0
Non-U.S. governments    
Available-for-sale securities    
Amortized cost, fixed maturities 880.4 833.4
Gross unrealized gains, fixed maturities 122.8 71.7
Gross unrealized losses, fixed maturities 2.5 14.6
Fair value, fixed maturities 1,000.7 890.5
States and political subdivisions    
Available-for-sale securities    
Amortized cost, fixed maturities 6,413.2 6,125.0
Gross unrealized gains, fixed maturities 561.0 196.0
Gross unrealized losses, fixed maturities 5.6 95.3
Fair value, fixed maturities 6,968.6 6,225.7
Corporate debt securities    
Available-for-sale securities    
Amortized cost, fixed maturities 35,200.2 35,134.6
Gross unrealized gains, fixed maturities 3,052.4 1,249.9
Gross unrealized losses, fixed maturities 81.3 845.2
Fair value, fixed maturities 38,171.3 35,539.3
Residential mortgage-backed pass-through securities    
Available-for-sale securities    
Amortized cost, fixed maturities 2,389.1 2,488.5
Gross unrealized gains, fixed maturities 56.7 21.9
Gross unrealized losses, fixed maturities 8.8 49.8
Fair value, fixed maturities 2,437.0 2,460.6
Commercial mortgage-backed securities    
Available-for-sale securities    
Amortized cost, fixed maturities 4,460.3 4,023.1
Gross unrealized gains, fixed maturities 130.7 17.1
Gross unrealized losses, fixed maturities 21.1 94.6
Fair value, fixed maturities 4,569.9 3,945.6
Other-than-temporary impairments in AOCI 20.5 16.3
Collateralized debt obligations    
Available-for-sale securities    
Amortized cost, fixed maturities 2,771.9 2,451.3
Gross unrealized gains, fixed maturities 1.1  
Gross unrealized losses, fixed maturities 13.6 30.5
Fair value, fixed maturities 2,759.4 2,420.8
Other-than-temporary impairments in AOCI 1.4 1.2
Other debt obligations    
Available-for-sale securities    
Amortized cost, fixed maturities 7,697.9 7,228.3
Gross unrealized gains, fixed maturities 141.3 39.4
Gross unrealized losses, fixed maturities 14.4 82.7
Fair value, fixed maturities 7,824.8 7,185.0
Other-than-temporary impairments in AOCI $ 34.2 $ 36.1