Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2018
Effective tax rate	(32.60%)	17.70%	(123.30%)	24.90%
Other Tax Expense (Benefit)	$ 11,200,000		$ 75,600,000
Federal Corporate tax rate	35.00%		35.00%				21.00%
Blended Corporate Tax rate	24.50%		24.50%
Global intangible low-taxed income- foreign tax deduction	50.00%		50.00%
Discrete net tax benefit- Tax Act			$ 61,400,000.0
Income tax expense (benefit) (Note 9)	$ (7,000,000)	$ 7,300,000	(64,500,000)	$ 19,100,000
DTA Corporate Rate Reduction Net Benefit			93,800,000
Transition tax obligation			$ 32,400,000
Foreign Tax Authority [Member] | France [Member]
Current period tax expense		$ 3,500,000
Scenario, Forecast [Member]
Federal Corporate tax rate						24.50%
Federal statutory income tax rate					21.00%