Acquisition (Details) (USD $) In Millions, unless otherwise specified				9 Months Ended	0 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Dec. 17, 2012 State	Sep. 30, 2013 Non-competition agreements [Member]	Dec. 17, 2012 Davenport [Member]	Sep. 30, 2013 Davenport [Member]	Sep. 30, 2013 Davenport [Member]	Sep. 30, 2013 Davenport [Member] Customer relationships [Member]	Dec. 17, 2012 Davenport [Member] Customer relationships [Member]	Dec. 17, 2012 Davenport [Member] Non-competition agreements [Member]
Business Acquisition [Line Items]
Number of states serviced			8
Total purchase price consideration					$ 40.8
Cash paid at closing for acquisition					34.3
Increase of total consideration							1.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Cash					0.3
Accounts receivable					21.2
Other receivables					3.8
Inventory					20.3
Prepaid expenses / other assets					2.6
Property, plant and equipment					5.3
Intangible assets					2.6				1.9	0.7
Goodwill	23.0	22.8			6.8
Net deferred tax liabilities					(1.3)
Capital lease liability					(10.9)
Other liabilities					(9.9)
Total consideration					40.8
Indemnity holdback for any post-closing liabilities					4.0
Period of time to release indemnity holdback					4 years
Contingent payment amount					0.6
Finite-lived intangible asset, useful life				5 years				10 years
Initial capital leases term							10 years
Capital lease obligations at the current period end						10.5	10.5
Acquisition related costs						$ 0.2	$ 0.5