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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Income Taxes
Effective tax rate (as a percent)			8.30%	(71.80%)
Federal statutory rate (as a percent)			21.00%	24.50%	35.00%
Valuation allowance on foreign tax credits	$ 38.1		$ 38.1
Income tax credits and incentives			19.3	$ 21.6
Nondeductible costs			14.6
Net benefit from Tax Cuts and Jobs Acts of 2017				41.7
Benefits from change in uncertain tax positions in US and Canada				33.8
Goodwill impairment charge				$ 33.9
Amount of uncertain tax positions for future years		$ 26.2
Gross book-tax differences from non-U.S. subsidiaries			$ 1,800.0

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