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Investments - Sales of Fixed Maturity and Equity Securities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fixed maturity securities    
Proceeds received $ 168.3 $ 95.5
Gross gains realized 2.4 1.2
Gross losses realized (2.9) (3.4)
Equity securities    
Proceeds received 5.8 0.4
Gross gains realized 1.7 0.1
Gross losses realized $ (0.1) $ 0.0