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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Income Taxes
Effective tax rate (as a percent)		29.70%	(46.70%)
Federal statutory rate (as a percent)		21.00%	21.00%
Income tax expense nondeductible Costs		$ 13.3
Tax expense related to Foreign residual income		8.8
State income tax expense		5.4	$ 5.8
Income tax credits and incentives		15.2	11.5
Valuation allowance on foreign tax credits	$ 38.1
Net benefit from Tax Cuts and Jobs Acts of 2017			$ 38.1
Gross book-tax differences from non-U.S. subsidiaries		$ 1,700.0

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