Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 Railcar
Contingencies (Textual) [Abstract]
Number of tank cars voluntarily recertified by Company		948
Inspection cycle for tank cars in service minimum	3 years
Inspection cycle for tank cars in service maximum	5 years
Minimum possible loss	$ 4.0
Maximum possible loss	29.4
Total accruals	16.1
Non-cancelable purchase obligations	649.6
Environmental and workplace matters
Contingencies (Textual) [Abstract]
Total accruals	7.2
Raw Materials and Components | Rail Inland Barge And Energy Equipment Groups
Contingencies (Textual) [Abstract]
Non-cancelable purchase obligations	$ 567.1