Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012
Income Tax Expense (Benefit) [Abstract]
Income tax expense (benefit) related to non-deductible compensation expenses	$ 2.0
Gross unrecognized tax benefits	54.4		53.8
Gross unrecognized tax benefits that would impact the effective tax rate if recognized	13.2		10.0
Net decrease in liability for unrecognized tax benefits for uncertain tax positions	0.6
Anticipated liability decrease for unrecognized tax benefits for uncertain tax positions	5.0
Interest and penalties included in liability for unrecognized tax benefits	6.5		6.1
Interest and penalties included in income tax expense	$ 0.4	$ 0.3
Effective income tax rate	44.90%	32.10%