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Investments - Net Realized Capital Gains and Losses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Major components of net realized capital gains (losses) on investments      
Fixed maturities, available-for-sale: Gross gains $ 134.2 $ 15.5 $ 40.2
Fixed maturities, available-for-sale: Gross losses (48.5) (15.3) (74.8)
Fixed maturities, available-for-sale: Net credit loss (22.9)    
Fixed maturities, available-for-sale: Net credit loss   (43.5) (29.1)
Fixed maturities, available-for-sale: Hedging, net (9.7) (9.3) (39.6)
Fixed maturities, trading 3.2 43.0 (9.0)
Equity securities 70.5 84.5 (17.7)
Mortgage loans gains (losses) (15.5) 3.0 6.2
Derivative net realized capital gains (losses) 77.3 (120.3) 11.7
Other gains (losses) 114.0 (10.4) 36.7
Net realized capital gains (losses) 302.6 (52.8) (75.4)
Unrealized gains (losses) on fixed maturities, trading 5.3 32.8 (12.2)
Unrealized gains (losses) on equity securities 64.6 61.6 (39.9)
Unrealized gains (losses) on equity securities reported in net investment income 35.2 66.9 4.9
Proceeds from sales of investments      
Proceeds from sales of investments in fixed maturities, available-for-sale $ 2,421.9 $ 1,654.8 $ 3,067.2