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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Income Tax Disclosure [Abstract]          
Effective income tax rate 6.10% 18.70% 9.20% 18.60%  
U.S. statutory rate 21.00% 21.00% 21.00% 21.00%  
Income tax liabilities $ 296.0   $ 296.0   $ 327.2
Gross unrecognized tax benefits 25.6   25.6   19.9
Accrued interest and penalties related to unrecognized tax benefits 3.9   3.9   $ 3.3
Reasonably possible amount of reduction in gross unrecognized tax benefits for the next twelve months 24.1   24.1    
Reasonably possible amount of net reduction to income tax provision if unrecognized tax benefits were recognized $ 25.8   $ 25.8