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Investments - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Gain (Loss) on Securities [Line Items]      
Document Period End Date Dec. 31, 2018    
Available-for-sale Securities, Gross Realized Gains $ 8.6 $ 69.7 $ 44.1
Noncash or Part Noncash Acquisition, Investments Acquired     44.0
Carrying value of securities pledged as collateral for the FHLB Loan 106.5    
Fixed maturities fair value of deposit with insurance regulators 8.9 9.3  
Proceeds on sales of available-for-sale securities 197.0 438.6 365.4
Other Invested Assets [Member]      
Gain (Loss) on Securities [Line Items]      
Available-for-sale Securities, Gross Realized Gains $ 0.0 $ 0.2 12.1
Other Invested Assets [Member] | Partnership Interest [Member]      
Gain (Loss) on Securities [Line Items]      
Available-for-sale Securities, Gross Realized Gains     $ 12.0