Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2015
Income Tax Holiday [Line Items]
Gross unrecognized tax benefits	$ 34.6		$ 34.6		$ 35.2
Gross unrecognized tax benefits that would impact the effective tax rate if recognized	24.0		24.0		23.9
Anticipated liability decrease for unrecognized tax benefits for uncertain tax positions	15.2		15.2
Interest and penalties included in liability for unrecognized tax benefits	4.4		$ 4.4		$ 4.2
Interest and penalties included in income tax expense	$ 0.4	$ 0.1
Effective income tax rate	24.80%	28.00%	27.00%	30.40%