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Investments - Net Realized Capital Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Major components of net realized capital gains (losses) on investments        
Net impairment (losses) recoveries on available-for-sale securities $ (10.0) $ (6.0) $ (58.1) $ (13.5)
Net realized capital gains (losses) 33.7 (114.6) 170.3 (48.4)
Mortgage loans        
Major components of net realized capital gains (losses) on investments        
Realized capital gains (losses) 0.1 2.3 2.6 (0.1)
Derivatives        
Major components of net realized capital gains (losses) on investments        
Realized capital gains (losses) (27.9) (57.6) 157.7 5.0
Other investment types        
Major components of net realized capital gains (losses) on investments        
Realized capital gains (losses) 6.7 (27.0) 9.2 (13.4)
Available-for-sale | Fixed maturities        
Major components of net realized capital gains (losses) on investments        
Gross gains 46.9 3.4 50.1 13.2
Gross losses (1.0) (1.8) (3.5) (3.3)
Net impairment (losses) recoveries on available-for-sale securities (8.6) (6.3) (56.7) (13.8)
Hedging, net (1.0) (25.3) 6.4 (35.9)
Proceeds from sales of investments        
Proceeds from sales of investments in fixed maturities, available-for-sale 454.6 325.0 660.4 881.3
Available-for-sale | Equity securities        
Major components of net realized capital gains (losses) on investments        
Net impairment (losses) recoveries on available-for-sale securities (1.4) 0.3 (1.4) 0.3
Trading | Fixed maturities        
Major components of net realized capital gains (losses) on investments        
Realized gains (losses) on trading securities 1.2 (5.0) 10.1 (4.3)
Trading | Equity securities        
Major components of net realized capital gains (losses) on investments        
Realized gains (losses) on trading securities $ 18.7 $ 2.4 $ (4.2) $ 3.9