Contingencies (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Contingencies (Textual) [Abstract]
Minimum possible loss	$ 7,300,000			$ 7,300,000
Maximum possible loss	32,400,000			32,400,000
Revenue	1,562,800,000		1,110,300,000	4,508,600,000		3,109,300,000
Cash and cash equivalents	663,700,000	[1]	402,600,000	663,700,000	[1]	402,600,000	428,500,000	573,000,000
Available liquidity when combined with capacity under committed credit facilities	1,300,000,000			1,300,000,000
Total accruals	19,100,000			19,100,000
Highway Products Litigation
Contingencies (Textual) [Abstract]
Damages awarded by jury verdict				175,000,000
Damages awarded by jury verdict, automatically trebled under the Act				525,000,000
Minimum possible loss	525,000,000			525,000,000
Maximum possible loss	709,000,000			709,000,000
Potential amount of supersedeas bond required in excess of final judgment				20.00%
Revenue				33,000,000
Total accruals	0			0
Train Derailment
Contingencies (Textual) [Abstract]
Number of tank cars owned by the Company and leased to third party				13
Number of tank cars manufactured by the Company				35
Number of tank cars involved in derailment				72
Total accruals	0			0
Environmental and workplace matters
Contingencies (Textual) [Abstract]
Total accruals	10,300,000			10,300,000
Minimum | Highway Products Litigation
Contingencies (Textual) [Abstract]
Civil penalties per violation, at the discretion of the District Court				5,500
Civil penalties, at the discretion of the District Court				5,500
Maximum | Highway Products Litigation
Contingencies (Textual) [Abstract]
Civil penalties per violation, at the discretion of the District Court				11,000
Civil penalties, at the discretion of the District Court				$ 184,000,000
Revenues as a percent of total consolidated revenues				1.00%

[1] (unaudited)