Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Railcar
Contingencies (Textual) [Abstract]
Total accrual	$ 17.8
Number of tank cars to be voluntarily recertified by the Company (in railcars)	948
Minimum possible loss	9.4
Maximum possible loss	30.1
Unrecorded Unconditional Purchase Obligation [Line Items]
Non-cancelable purchase obligations	694.9
Raw Materials and Components | Rail, Inland Barge, and Energy Equipment Groups
Unrecorded Unconditional Purchase Obligation [Line Items]
Non-cancelable purchase obligations	577.8
Highway Products litigation
Contingencies (Textual) [Abstract]
Total accrual	0
Railcar derailment
Contingencies (Textual) [Abstract]
Total accrual	0
Number of tank cars manufactured by the Company (in railcars)	35
Number of tank cars involved in derailment (in railcars)	72
Number of tank cars owned by the Company and leased to third party (in railcars)	13
Environmental and workplace matters
Contingencies (Textual) [Abstract]
Total accrual	$ 8.3
Minimum
Contingencies (Textual) [Abstract]
Percent of tank cars recertified by the Company	90.00%
Inspection cycle for tank cars in service (in years)	3 years
Maximum
Contingencies (Textual) [Abstract]
Inspection cycle for tank cars in service (in years)	5 years