Liquidity (Risks and Uncertainties) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Risks and Uncertainties [Line Items]
Cash and cash equivalents	$ 136,400,000	$ 140,500,000	$ 171,100,000	$ 176,300,000
Net cash used in operating activities	25,800,000	56,200,000
Long-term Debt, Gross	1,093,600,000		1,116,200,000
Defined benefit plans, estimated benefit obligation for remaining fiscal year	47,000,000
Multi-employer plans, estimated benefit obligation for remaining fiscal year	66,100,000
Operating Leases, Future Minimum Payments, Due Remainder of Fiscal Year	48,700,000
Operating Leases, Future Minimum Payments Due	206,400,000
Payments to Acquire Property, Plant, and Equipment	21,300,000	11,700,000
2014 ABL Facility Credit Agreement [Member]
Risks and Uncertainties [Line Items]
Amount Able to be Drawn	39,200,000.0
Line of Credit [Member] | 2014 ABL Facility Credit Agreement [Member]
Risks and Uncertainties [Line Items]
Total availability	175,600,000.0
Minimum availability of the lesser of the aggregate amount of commitments from lenders or the borrowing base	10.00%
Revenue Equipment [Member]
Risks and Uncertainties [Line Items]
Operating lease commitment	$ 47,600,000
Operating lease term	4 years