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Investments - Sales of Fixed Maturity and Equity Securities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Fixed maturity securities        
Proceeds received $ 143.5 $ 197.0 $ 206.2 $ 365.3
Gross gains realized 0.3 1.2 0.6 3.6
Gross losses realized (8.4) (2.3) (11.1) (5.2)
Equity securities        
Proceeds received 9.8 0.0 9.8 5.8
Gross gains realized 0.0 0.0 0.0 1.7
Gross losses realized $ (11.3) $ 0.0 $ (11.3) $ (0.1)