Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2012
Income Tax Holiday [Line Items]
ProformaIncomeTaxBenefitDueToReinstatedTaxProvision			$ 1.5
Gross unrecognized tax benefits	50.0		50.0		53.8
Gross unrecognized tax benefits that would impact the effective tax rate if recognized	15.5		15.5		10.0
Net decrease in liability for unrecognized tax benefits for uncertain tax positions			(3.8)
Anticipated liability decrease for unrecognized tax benefits for uncertain tax positions	4.3		4.3
Interest and penalties included in liability for unrecognized tax benefits	5.3		5.3		6.1
Interest and penalties included in income tax expense			$ 0.8	$ 0.7
Effective income tax rate	31.70%	31.20%	37.90%	31.60%