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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Mar. 31, 2012
Fuel Commitments [Member]
Minimum amount committed under significant purchase commitment	$ 83.4
Multi-Employer Plan Withdrawal Liability [Member]
Loss contingency, estimate of possible loss	220.0
Tax rate for potential IRS non-deductible excise tax	5.00%
Loss contingency, recorded amount	$ 47.7

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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