Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate	17.40%	35.00%	22.00%	33.10%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	28.10%
Income Tax Expense (Benefit)	$ 98.0
Tax Cuts and Jobs Act of 2017 Incomplete Accounting Provisional Income Tax One Time Benefit, Net	45.7
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Undistributed Accumulated Earnings of Foreign Subsidiary, Provisional Unrecognized Deferred Tax Liability	23.1
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit	84.7
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit)	$ 15.9