Income Taxes (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012
Income Taxes [Abstract]
Accrued income taxes	$ 12.4	$ 0
Gross tax contingency reserve	2.0
Accrued tax liabilities included in the gross tax contingency reserve	1.0
Accrued interest and penalties included in the gross tax contingency reserve	1.0
Gross tax contingency reserve, classified as current liabilities	0.2
Gross tax contingency reserve, classified as noncurrent liabilities	$ 1.8

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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