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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Taxes    
Effective tax rate (as a percent) 15.50% 22.40%
Tax at federal statutory rate (as a percent) 21.00% 21.00%
Income tax credits and incentives $ 13.3 $ 10.9
Benefit related to release of valuation allowance on foreign tax credits 21.9  
Tax expense related to Foreign residual income 11.6 7.2
State income tax, net of federal benefit   $ 4.5
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 $ 16.1