Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	21.90%	27.00%
Incomplete accounting provisional income tax one time benefit, net	$ 1.1
Undistributed accumulated earnings of foreign subsidiary, provisional unrecognized deferred tax liability			$ 19.2
Accrual On Foreign Withholding Taxes			28.3
Change in tax rate, deferred tax liability, provisional income tax expense (benefit)			253.3
Transition tax for accumulated foreign earnings, provisional income tax expense (benefit)			$ 22.2