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Income Taxes (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income Taxes    
Effective tax rate (as a percent) 24.80% 25.00%
Tax at federal statutory rate (as a percent) 21.00% 21.00%
Income tax credits and incentives $ 26.5 $ 28.4
Tax expense related to nondeductible costs   3.2
Benefit related to release of valuation allowance on foreign tax credits 13.9  
Tax expense related to Foreign residual income 19.5 20.7
State income tax, net of federal benefit 11.1 $ 10.7
Tax benefit related to the release of a valuation allowance on net operating losses 21.9  
Gross book-tax differences from non-U.S. subsidiaries 1,500.0  
Valuation allowances 14.9  
Valuation allowance $ 6.4