Accounting Policies (Details) $ in Millions			12 Months Ended
	Nov. 30, 2011	Sep. 30, 2010	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Impaired Long-Lived Assets Held and Used [Line Items]
Reverse stock split, conversion ratio	0.003333
Rerate reserve as a reduction to accounts receivable			$ 10.4	$ 8.1
Allowance for doubtful accounts			9.5	7.4
Foreign currency transactions gains			$ 0.9	$ 9.3	$ 5.7
Risk-free rate for maturities of workers' compensation claims			1.01%	1.01%	0.90%
Risk-free rate for property damage and liability claims			0.80%	0.70%	0.40%
Accrued claims and insurance			$ 364.4	$ 392.7
Labor Force Concentration Risk [Member] | Workforce Subject to Collective Bargaining Arrangements [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Percentage of labor force			78.00%
February 17, 2010 Amendment [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Reverse stock split, conversion ratio		0.04
Accumulated Other Comprehensive Income (Loss) [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Reclassification of net losses to net income			$ 13.7	14.1	$ 12.7
Long-term Debt [Member] | Accounting Standards Update 2015-03
Impaired Long-Lived Assets Held and Used [Line Items]
Deferred finance costs				15.2
Other Assets [Member] | Accounting Standards Update 2015-03
Impaired Long-Lived Assets Held and Used [Line Items]
Deferred finance costs				$ (15.2)