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Investments - Sales of Fixed Maturity and Equity Securities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fixed maturity securities        
Proceeds received $ 155.4 $ 58.6 $ 319.2 $ 352.8
Gross gains realized 3.2 3.7 6.2 14.0
Gross losses realized (0.7) 0.0 (4.3) (5.9)
Equity securities        
Proceeds received 0.3 0.3 1.0 12.4
Gross gains realized 0.1 0.1 0.3 2.1
Gross losses realized $ 0.0 $ 0.0 $ 0.0 $ (1.8)