Financing Obligations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012
Sale Leaseback Transaction [Line Items]
2012	$ 11.4
2013	17.4
2014	17.6
2015	19.0
2016	17.6
Thereafter	206.2
Total minimum lease payments	289.2
Less interest	(132.8)
Total financing obligations	156.4
Less current portion	(3.8)
Long-term financing obligations	152.6
Reduction in Property and Equipment and Financing Obligations as a Result of Sales Transactions	$ 9.2
2012 [Member]
Sale Leaseback Transaction [Line Items]
Number of Monthly Leaseback Obligation Payments in Fiscal Year	11
2015 [Member]
Sale Leaseback Transaction [Line Items]
Number of Monthly Leaseback Obligation Payments in Fiscal Year	13

Number of Monthly Leaseback Obligation Payments in Fiscal Year

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Present Value of Future Minimum Lease Payments Sale Leaseback Transactions, Current

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Present Value of Future Minimum Lease Payments Sale Leaseback Transactions, Noncurrent

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Reduction in Property and Equipment and Financing Obligations as a Result of Sales Transactions

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The interest portion of minimum lease payments required under transactions involving the sale of property to another party and the lease of the property back to the seller accounted for as capital leases, under the deposit method, or as a financing that represents the finance cost of the arrangement.

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