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Investments - Net Realized Capital Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale Securities Including Securities Pledged [Line Items]        
Equity Securities, Securities Still Held, Change in Fair Value Recognized through the Income Statement   $ (4.0)    
Proceeds from Sale of Debt Securities, Available-for-sale   2,498.0 $ 2,916.0 $ 1,825.0
Realized capital gains (losses)   (242.0) (200.0) (213.0)
Proceeds from sale of investments        
Gross gains   14.0 30.0 20.0
Gross losses   50.0 39.0 85.0
Derivatives        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses)   (36.0) 9.0 51.0
Other investments        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses)   4.0 (4.0) 0.0
Fixed maturities, available-for-sale, including securities pledged        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses)   (69.0) (29.0) (70.0)
Fixed maturities, at fair value using the fair value option        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses)   (227.0) (226.0) (201.0)
Equity securities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) $ 0.0 (4.0) 0.0  
Fixed maturities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses)   (4.0) (5.0) (6.0)
Guaranteed benefit derivatives        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses)   $ 94.0 $ 55.0 $ 13.0