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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Effective tax rate (as a percent)	31.30%	758.90%
Federal statutory rate (as a percent)	21.00%	21.00%
Income tax expense nondeductible Costs	$ 5.6
Tax expense related to Foreign residual income	4.0
State income tax expense	2.8
Income tax credits and incentives	7.4
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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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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