Contingencies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 Railcar
Contingencies (Textual) [Abstract]
Total accruals	$ 19.7
Number of tank cars to be voluntarily recertified by Company	948
Minimum possible loss	8.0
Maximum possible loss	33.3
Highway Products litigation
Contingencies (Textual) [Abstract]
Total accruals	0
Environmental and workplace matters
Contingencies (Textual) [Abstract]
Total accruals	$ 10.0
Minimum
Contingencies (Textual) [Abstract]
Percent of tankcars recertified by Company	75.00%
Inspection cycle for tank cars in service	3 years
Maximum
Contingencies (Textual) [Abstract]
Inspection cycle for tank cars in service	5 years