Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Income Tax Holiday [Line Items]
Gross unrecognized tax benefits	$ 29.7		$ 29.7		$ 29.5
Gross unrecognized tax benefits that would impact the effective tax rate if recognized	19.1		19.1		18.9
Interest and penalties included in liability for unrecognized tax benefits	$ 3.7		3.7		$ 3.4
Interest and penalties included in income tax expense			$ 0.4	$ 0.8
Effective income tax rate	27.60%	28.60%	32.10%	27.70%