Contingencies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 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	19.8
Total Accruals	10.1
Reserve for probable and estimable environmental and workplace liabilities	$ 7.4