v3.25.1
Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Income Tax Disclosure [Abstract]          
Effective income tax rate 17.10% 14.50% 16.80% 16.10%  
Income tax liabilities $ 97.0   $ 97.0    
Gross unrecognized tax benefits 27.0   27.0   $ 25.0
Accrued interest and penalties related to unrecognized tax benefits 2.0   2.0   $ 2.0
Reasonably possible amount of reduction in gross unrecognized tax benefits for the next twelve months 2.0   2.0    
Reasonably possible amount of net reduction to income tax provision if unrecognized tax benefits were recognized $ 3.0   $ 3.0