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Investments - Net Realized Capital Gains and Losses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Major components of net realized capital gains (losses) on investments      
Fixed maturities, available-for-sale: Gross gains $ 15.5 $ 40.2 $ 14.7
Fixed maturities, available-for-sale: Gross losses (15.3) (74.8) (27.2)
Fixed maturities, available-for-sale: Net impairment recoveries (losses) (43.5) (29.1)  
Fixed maturities, available-for-sale: Hedging, net (9.3) (39.6) (28.5)
Fixed maturities, trading 43.0 (9.0) (8.0)
Equity securities, available-for-sale: Gross gains     0.2
Net impairment (losses) recoveries on available-for-sale securities     (81.8)
Equity securities, trading     65.0
Equity securities 84.5 (17.7)  
Net realized capital gains (losses) (52.8) (75.4) 524.2
Unrealized gains (losses) on fixed maturities, trading 32.8 (12.2) (7.5)
Unrealized gains (losses) on equity securities, trading     45.3
Unrealized gains (losses) on equity securities, trading reported in net investment income     34.9
Unrealized gains (losses) on equity securities 61.6 (39.9)  
Unrealized gains (losses) on equity securities reported in net investment income 66.9 4.9  
Proceeds from sales of investments      
Proceeds from sales of investments in fixed maturities, available-for-sale 1,654.8 3,067.2 1,345.8
Fixed maturities      
Major components of net realized capital gains (losses) on investments      
Fixed maturities, available-for-sale: Net impairment recoveries (losses)   (29.1) (81.7)
Equity securities      
Major components of net realized capital gains (losses) on investments      
Net impairment (losses) recoveries on available-for-sale securities     (0.1)
Mortgage loans      
Major components of net realized capital gains (losses) on investments      
Realized capital gains (losses) 3.0 6.2 9.0
Derivatives      
Major components of net realized capital gains (losses) on investments      
Realized capital gains (losses) (120.3) 11.7 (149.8)
Other investment types      
Major components of net realized capital gains (losses) on investments      
Realized capital gains (losses) $ (10.4) $ 36.7 $ 730.6