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Investments - Summary of Proceeds and Gains (Losses) Realized on Securities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fixed maturity securities        
Proceeds received $ 68.3 $ 196.0 $ 163.8 $ 294.2
Gross gains realized 1.7 5.5 3.0 10.3
Gross losses realized (0.2) (5.6) (3.6) (5.9)
Equity Securities, FV-NI, Realized Gain (Loss) [Abstract]        
Proceeds received 0.3 10.6 0.7 12.1
Gross gains realized 0.1 1.7 0.2 2.0
Gross losses realized $ 0.0 $ (1.2) $ 0.0 $ (1.8)