Income Taxes (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Prepaid taxes	$ 21.4	$ 7.5
Gross tax contingency reserve	0.9
Accrued tax liabilities included in the gross tax contingency reserve	0.5
Accrued interest and penalties included in the gross tax contingency reserve	0.4
Gross tax contingency reserve, classified as current liabilities	0
Gross tax contingency reserve, classified as noncurrent liabilities	$ 0.9