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Investments - Sales of Fixed Maturity and Equity Securities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fixed maturity securities        
Proceeds received $ 135.2 $ 164.6 $ 341.4 $ 529.9
Gross gains realized 1.4 1.1 2.0 4.7
Gross losses realized (2.8) (5.0) (13.9) (10.2)
Equity securities        
Proceeds received 6.8 0.2 16.6 6.0
Gross gains realized 0.0 0.0 0.0 1.7
Gross losses realized $ (0.5) $ 0.0 $ (11.8) $ (0.1)