Railcar Leasing and Management Services Group (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Revenues:
Total revenues	$ 1,485.3		$ 1,066.1		$ 2,945.8		$ 1,999.0
Operating profit:
Total operating profit	302.0		183.4		693.3		342.9
Selected expense information:
Depreciation					111.0		102.4
Interest:
Interest expense	46.9		46.5		93.2		95.7
Railcar Leasing and Management Services Group
Revenues:
Total revenues	225.4		169.6		667.6		304.0
Operating profit:
Total operating profit	102.4		75.7		332.7		137.3
Operating profit margin:
Total operating profit margin	44.20%		44.60%		49.30%		45.20%
Selected expense information:
Depreciation	32.2	[1]	32.0	[1]	64.7	[1]	63.0	[1]
Percent Change, Depreciation	0.60%	[1]			2.70%	[1]
Maintenance	20.0	[1]	18.4	[1]	41.0	[1]	37.4	[1]
Percent Change, Maintenance	8.70%	[1]			9.60%	[1]
Rent	13.3	[1]	13.3	[1]	26.6	[1]	26.7	[1]
Percent Change, Rent	0.00%	[1]			(0.40%)	[1]
Interest:
Interest expense	38.1	[1]	38.0	[1]	75.4	[1]	78.9	[1]
Railcar Leasing and Management Services Group | Leasing and management
Revenues:
Total revenues	160.7		150.7		310.9		285.0
Percent Change	6.60%				9.10%
Operating profit:
Total operating profit	75.5		71.0		139.4		125.8
Percentage Change	6.30%				10.80%
Operating profit margin:
Total operating profit margin	47.00%		47.10%		44.80%		44.10%
Railcar Leasing and Management Services Group | Railcars owned one year or less at the time of sale
Revenues:
Total revenues	70.8		18.9		363.7		19.0
Operating profit:
Total operating profit	17.2		3.5		106.1		3.5
Railcar Leasing and Management Services Group | Railcars owned more than one year at the time of sale
Operating profit:
Total operating profit	9.7		1.2		87.2		8.0
Rail Group
Revenues:
Total revenues	760.7		474.1		1,361.8		897.7
Operating profit:
Total operating profit	176.0		107.9		343.5		210.8
Intercompany
Revenues:
Total revenues	0		0		0		0
Intercompany | Railcar Leasing and Management Services Group
Revenues:
Total revenues	6.1		0		7.0		0
Interest:
Interest expense	0	[1]	1.1	[1]	0	[1]	3.8	[1]
Intercompany | Rail Group
Revenues:
Total revenues	134.9		193.9		391.2		395.8
Total
Revenues:
Total revenues	1,485.3		1,066.1		2,945.8		1,999.0
Total | Railcar Leasing and Management Services Group
Revenues:
Total revenues	231.5		169.6		674.6		304.0
Percent Change	36.50%				121.90%
Operating profit:
Total operating profit	102.4		75.7		332.7		137.3
Percentage Change	35.30%				142.30%
Interest:
Interest expense	38.1	[1]	39.1	[1]	75.4	[1]	82.7	[1]
Percent Change, Total interest expense	(2.60%)	[1]			(8.80%)	[1]
Total | Rail Group
Revenues:
Total revenues	$ 895.6		$ 668.0		$ 1,753.0		$ 1,293.5

[1] Depreciation, maintenance, and rent expense are components of operating profit. Amortization of deferred profit on railcars sold from the Rail Group to the Leasing Group is included in the operating profits of the Leasing Group resulting in the recognition of depreciation expense based on the Company's original manufacturing cost of the railcars. Interest expense is not a component of operating profit and includes the effect of hedges. Intercompany interest expense is eliminated in consolidation and arises from Trinity’s previous ownership of a portion of TRIP Holdings’ Senior Secured Notes, which notes were retired in full in May 2013. See Note 11 Debt.