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Capital Leases (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Capital Leases [Abstract]
Obligations under capital leases	$ 158.6
Capital leases obligations, current	65.5
Revenue equipment cost	335.1
Accumulated amortization	$ 132.3

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.

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