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Investments - Summary of Proceeds and Gains (Losses) Realized on Securities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fixed maturity securities    
Proceeds received $ 95.5 $ 98.2
Gross gains realized 1.2 4.8
Gross losses realized (3.4) (0.3)
Equity Securities, FV-NI, Realized Gain (Loss) [Abstract]    
Proceeds received 0.4 1.5
Gross gains realized 0.1 0.3
Gross losses realized $ 0.0 $ (0.6)