Railcar Leasing and Management Services Group (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenues:
Total revenues	$ 1,256.0	$ 1,110.3	$ 1,066.1	$ 932.9	$ 1,012.9	$ 907.3	$ 995.5	$ 896.2	$ 4,365.3		$ 3,811.9		$ 2,938.3
Operating profit:
Total operating profit	224.4	205.6	183.4	159.5	158.9	140.7	152.5	122.7	772.9		574.8		426.8
Selected expense information:
Depreciation									211.5		193.7		187.7
Interest:
Total interest expense									187.3		194.7		185.3
Intercompany
Revenues:
Total revenues									0		0		0
Total
Revenues:
Total revenues									4,365.3		3,811.9		2,938.3
Railcar Leasing and Management Services Group
Revenues:
Total revenues									645.4		644.4		551.4
Percent Change, Revenues									(0.30%)		17.20%
Operating profit:
Total operating profit									296.8		300.9		254.5
Percentage Change, Operating profit									(1.40%)		18.20%
Operating profit margin:
Total operating profit margin									46.00%		46.50%		46.10%
Selected expense information:
Depreciation									129.0	[1]	120.5	[1]	115.7	[1]
Percent Change, Depreciation									7.10%	[1]	4.10%	[1]
Maintenance									71.5	[1]	59.4	[1]	58.2	[1]
Percent Change, Maintenance									20.40%	[1]	2.10%	[1]
Rent									53.3	[1]	50.9	[1]	48.6	[1]
Percent Change, Rent									4.70%	[1]	4.70%	[1]
Interest:
Total interest expense									153.5	[1]	161.2	[1]	154.4	[1]
Percent Change, Total interest expense									(9.80%)	[1]	8.40%	[1]
Railcar Leasing and Management Services Group | Intercompany
Revenues:
Total revenues									0		2.7		0.6
Interest:
Total interest expense									3.8	[1]	13.1	[1]	6.4	[1]
Railcar Leasing and Management Services Group | Total
Revenues:
Total revenues									645.4		647.1		552.0
Operating profit:
Total operating profit									296.8		300.9		254.5
Interest:
Total interest expense									157.3	[1]	174.3	[1]	160.8	[1]
Railcar Leasing and Management Services Group | Leasing and management
Revenues:
Total revenues									586.9		528.5		492.6
Percent Change, Revenues									11.10%		7.30%
Operating profit:
Total operating profit									267.3		242.6		225.1
Percentage Change, Operating profit									10.20%		7.80%
Operating profit margin:
Total operating profit margin									45.50%		45.90%		45.70%
Railcar Leasing and Management Services Group | Railcars owned one year or less at the time of sale
Revenues:
Total revenues									58.5		118.6		59.4
Operating profit:
Total operating profit									9.1		24.8		13.2
Railcar Leasing and Management Services Group | Railcars owned more than one year at the time of sale
Operating profit:
Total operating profit									$ 20.4		$ 33.5		$ 16.2

[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 arises from Trinity’s previous ownership of a portion of TRIP Holdings’ Senior Secured Notes and is eliminated in consolidation. See Note 11 Debt.