Lease Obligations (Schedule of Future Lease Commitments) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Capital Leases
Future minimum lease commitments, 2016	$ 57.6
Future minimum lease commitments, 2017	45.6
Future minimum lease commitments, 2018	26.8
Future minimum lease commitments, 2019	7.6
Future minimum lease commitments, 2020	0.5
Future minimum lease commitments, thereafter	0.1
Total minimum lease payments	138.2
Less amounts representing interest	(7.3)
Total capital lease obligations, net of interest	130.9	$ 176.5
Less current portion	(54.8)
Long-term portion of capital lease obligations, net of interest	76.1
Operating Leases
Future minimum lease commitments, 2016	75.0
Future minimum lease commitments, 2017	51.8
Future minimum lease commitments, 2018	36.3
Future minimum lease commitments, 2019	18.3
Future minimum lease commitments, 2020	9.9
Future minimum lease commitments, thereafter	10.0
Total minimum lease payments	$ 201.3

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.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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