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Income Taxes - Effective Tax Rate (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]        
Income before income tax expense (benefit) $ 23.1 $ 39.6 $ 77.9 $ 106.4
Income tax expense (benefit) $ 14.6 $ (2.9) $ 29.7 $ 14.3
Effective tax rate (as a percent) 63.20% (7.30%) 38.10% 13.40%