Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	24.60%	29.00%	23.10%	31.50%
Change in enacted tax rate, percent			28.10%
Income tax expense (benefit)			$ 140.0
Incomplete accounting provisional income tax one time benefit, net			42.9
Undistributed accumulated earnings of foreign subsidiary, provisional unrecognized deferred tax liability			20.6
Change in tax rate, deferred tax liability, provisional income tax expense (benefit)			82.0
Transition tax for accumulated foreign earnings, provisional income tax expense (benefit)			$ 18.6