Liquidity (Risks and Uncertainties) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Risks and Uncertainties [Line Items]
Net cash used in operating activities	$ 12,100,000	$ (25,900,000)	$ (26,000,000)
Aggregate principal amount of outstanding indebtness	1,363,400,000
Future operating lease obligations	56,100,000
Capital expenditures	66,900,000	66,400,000	71,600,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Risks and Uncertainties [Line Items]
Funding obligations for pension plans	79,900,000
Multiemployer Plans, Pension [Member]
Risks and Uncertainties [Line Items]
Funding obligations for pension plans	88,700,000
ABL Facility Credit Agreement [Member]
Risks and Uncertainties [Line Items]
Maximum borrowing capacity	400,000,000
Line of credit facility, total availability	227,800,000
Line of credit facility, remaining borrowing capacity	376,400,000
2014 ABL Facility Credit Agreement [Member] [Member]
Risks and Uncertainties [Line Items]
Maximum borrowing capacity	450,000,000
Revenue equipment [Member]
Risks and Uncertainties [Line Items]
Operating Lease Commitment	$ 67,100,000
Operating Lease Term	6 years