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Investments - Net Realized Capital Gains and Losses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Major components of net realized capital gains (losses) on investments      
Net impairment (losses) recoveries on available-for-sale securities $ (30.2) $ (78.0) $ (116.0)
Net realized capital gains (losses) (51.1) 14.7 (225.2)
Proceeds from sales of investments      
Proceeds from sales of investments in fixed maturities, available-for-sale 1,537.5 2,251.2 1,773.0
Mortgage loans      
Major components of net realized capital gains (losses) on investments      
Realized capital gains (losses) (0.1) (9.4) (15.8)
Derivatives      
Major components of net realized capital gains (losses) on investments      
Realized capital gains (losses) 38.1 13.1 (23.0)
Other investment types      
Major components of net realized capital gains (losses) on investments      
Realized capital gains (losses) 1.5 20.4 9.9
Available-for-sale | Fixed maturities      
Major components of net realized capital gains (losses) on investments      
Gross gains 20.9 61.3 30.5
Gross losses (6.7) (24.1) (15.9)
Net impairment (losses) recoveries on available-for-sale securities (30.5) (88.0) (115.7)
Hedging, net (58.3) (21.5) (115.5)
Available-for-sale | Equity securities      
Major components of net realized capital gains (losses) on investments      
Gross gains 1.2 0.2 0.8
Gross losses (1.8) (0.2)  
Net impairment (losses) recoveries on available-for-sale securities 0.3 10.0 (0.3)
Trading | Fixed maturities      
Major components of net realized capital gains (losses) on investments      
Realized gains (losses) on trading securities (12.3) 31.2 (7.1)
Trading | Equity securities      
Major components of net realized capital gains (losses) on investments      
Realized gains (losses) on trading securities $ (3.4) $ 21.7 $ 26.9