Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended
	Sep. 30, 2011 Railcar	Sep. 30, 2011	Dec. 31, 2011
Contingencies (Textual) [Abstract]
Date Company received a letter from the Federal Railroad Administration ("FRA") containing a rail worthiness directive pertaining to a specific design of tank cars	In September 2011
Number of tank cars manufactured for transport of poison inhalation hazard materials	948
Number of tank cars Federal Railroad Administration received notification regarding potential leaks around the man way nozzles	5
Number of recently manufactured tank cars removed from service pursuant to directive	100
Number of randomly selected tank cars removed from service	67
Number of tank cars manufactured since 2006 less the number of manufactured tank cars removed from service pursuant to defective	848
Recertification process schedule description		through September, 2014
Inspection cycle for tank cars in service minimum		3 years
Inspection cycle for tank cars in service maximum		5 years
Minimum possible loss			$ 6.2
Maximum possible loss			22.9
Total Accruals			12.3
Reserve for probable and estimable liabilities with respect to the investigations, assessments and remedial responses			7.6
Number of tank cars voluntarily recertified by Company	948
Non-cancelable purchase obligations			399.6
Rail, Inland Barge and Energy Equipment Groups [Member]
Contingencies (Textual) [Abstract]
Amount for purchase of raw materials and components under Non-cancelable purchase obligations			$ 347.6