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Investments - Net Realized Capital Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Major components of net realized capital gains (losses) on investments    
Fixed maturities, available-for-sale: Gross gains $ 37.0 $ 23.1
Fixed maturities, available-for-sale: Gross losses (5.1) (4.2)
Fixed maturities, available-for-sale: Net credit loss (4.4) (7.9)
Fixed maturities, available-for-sale: Hedging, net   (1.5)
Fixed maturities, trading (14.1) (16.4)
Equity securities 16.2 (63.7)
Mortgage loans gains (losses) 4.7 (15.7)
Derivative net realized capital gains (losses) 113.6 290.5
Other gains (losses) 3.5 (72.8)
Net realized capital gains (losses) 151.4 131.4
Unrealized gains (losses) on fixed maturities, trading (14.0) (14.2)
Unrealized gains (losses) on equity securities 7.4 (66.0)
Unrealized gains (losses) on equity securities reported in net investment income 5.2 (38.5)
Proceeds from sales of investments    
Proceeds from sales of investments in fixed maturities, available-for-sale $ 554.2 $ 541.6