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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Income Tax Disclosure [Abstract]        
Income tax expense $ 22.2 $ 26.1 $ 79.4 $ 71.9
Effective income tax rate 26.00% 30.00%