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Income Taxes - Summary of Income Tax Benefit and Effective Income Tax Rate (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Income Tax Disclosure [Abstract]        
Income (loss) before income taxes $ 33.4 $ 24.4 $ 58.3 $ (29.6)
Income tax expense (benefit) $ 9.9 $ 7.6 $ 17.5 $ (5.5)
Effective income tax rate 29.60% 31.10% 30.00% 18.60%