Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014
Income Tax Holiday [Line Items]
Gross unrecognized tax benefits	$ 37.1		$ 37.1		$ 41.5
Gross unrecognized tax benefits that would impact the effective tax rate if recognized	24.2		24.2		25.4
Net change in liability for unrecognized tax benefits for uncertain tax positions			(4.4)
Anticipated liability decrease for unrecognized tax benefits for uncertain tax positions	10.7		10.7
Interest and penalties included in liability for unrecognized tax benefits	5.3		5.3		5.5
Interest and penalties included in income tax expense		$ 0.8	$ 0.7
Effective income tax rate	29.70%	30.30%	30.20%	32.40%