Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	24.70%	(14.10%)	23.40%	6.00%
Undistributed accumulated earnings of foreign subsidiary, provisional unrecognized deferred tax liability	$ 19,200,000		$ 19,200,000
Accrual On Foreign Withholding Taxes					$ 28,300,000
Change in Accrual On Foreign Withholding Taxes	$ 0		0
Change in tax rate, deferred tax liability, provisional income tax expense (benefit)					253,300,000
Change in Tax Cuts and Jobs Act of 2017 Incomplete Accounting Change in Tax Rate Deferred Tax Liability Provisional Income Tax (Expense) Benefit			0.00
Transition tax for accumulated foreign earnings, provisional income tax expense (benefit)					$ 22,900,000
Change in Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit)			$ 0