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Income Taxes - Schedule of Income Tax Expense and Effective Tax Rate (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Income Tax Disclosure [Abstract]        
Income tax expense $ 14.2 $ 12.6 $ 40.4 $ 45.9
Effective tax rate percentage 23.90% 24.80% 75.50% 25.80%