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Investments - Net Realized Capital Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Major components of net realized capital gains (losses) on investments        
Net impairment (losses) recoveries on available-for-sale securities $ (9.0) $ (14.2) $ (18.9) $ (43.0)
Gains (losses) on equity securities 5.6   3.6  
Net realized capital gains (losses) 67.4 (95.9) 42.3 (112.5)
Unrealized gains (losses) on equity securities 0.1   (14.1)  
Unrealized gains (losses) on equity securities reported in net investment income 3.3   3.2  
Fixed maturities        
Major components of net realized capital gains (losses) on investments        
Gross gains 0.7 6.2 5.0 10.2
Gross losses (18.5) (7.3) (45.2) (15.5)
Net impairment (losses) recoveries on available-for-sale securities (9.0) (14.2) (18.9) (43.0)
Hedging, net (2.9) (2.7) (8.0) (16.0)
Gains (losses) on trading securities (2.7) 1.5 (13.4) 1.8
Unrealized gains (losses) on trading securities (2.7) 1.4 (13.4) 2.4
Proceeds from sales of investments        
Proceeds from sales of investments in fixed maturities, available-for-sale 525.9 444.1 1,737.7 805.4
Equity securities        
Major components of net realized capital gains (losses) on investments        
Gains (losses) on trading securities   14.7   36.4
Unrealized gains (losses) on trading securities   9.9   27.6
Unrealized gains (losses) on trading securities reported in net investment income   6.6   27.3
Mortgage loans        
Major components of net realized capital gains (losses) on investments        
Realized capital gains (losses) 2.5 0.1 2.9 (0.3)
Derivatives        
Major components of net realized capital gains (losses) on investments        
Realized capital gains (losses) (37.4) (103.6) (28.0) (110.3)
Other investment types        
Major components of net realized capital gains (losses) on investments        
Realized capital gains (losses) $ 129.1 $ 9.4 $ 144.3 $ 24.2