Liquidity (Risks and Uncertainties) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Risks and Uncertainties [Line Items]
Net cash used in operating activities	$ 28.5	$ 12.1	$ (25.9)
Aggregate principal amount of outstanding indebtness	1,116.2us-gaap_DebtAndCapitalLeaseObligations
Funding obligations for single-employer pension plans	60.3
Funding obligations for multi-employer pension plans	91.6
Future operating lease obligations	63.6
Capital expenditures	69.2	66.9	66.4
ABL Facility Credit Agreement [Member]
Risks and Uncertainties [Line Items]
Line of credit facility, total availability	198.2
Revenue equipment [Member]
Risks and Uncertainties [Line Items]
Operating Lease Commitment	$ 65.0
Operating Lease Term	5 years

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Topic 840

-SubTopic 20

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-Paragraph 2

-Subparagraph (a)

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Investing Activities

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Defined Benefit Plan, Estimated Benefit Obligation Next Fiscal Year

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Multiemployer Plans, Estimated Benefit Obligation Next Fiscal Year

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Operating Lease Commitment

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Operating Lease Term

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