Railcar Leasing and Management Services Group (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	$ 578.2	$ 573.0
Property, plant, and equipment, net	5,320.3	4,745.2
Net deferred profit on railcars sold to the Leasing Group	(549.7)	(446.2)
Property, plant, and equipment, net	4,770.6	4,299.0
Restricted cash	260.7	223.2
Debt:
Less: unamortized discount	(74.1)	(87.5)
Total debt	2,989.8	3,055.0
Net deferred tax liabilities	639.4	555.8
Recourse
Debt:
Recourse	493.1	545.6
Less: unamortized discount	(74.1)	(87.5)
Total debt	419.0	458.1
Non-recourse
Debt:
Non-recourse	2,570.8	2,705.7
Less: non-recourse debt owned by Trinity		(108.8)
Partially-owned subsidiaries
Consolidating Financial Information
Restricted cash	77.1	57.8
Leasing Group
Consolidating Financial Information
Net deferred profit on railcars sold to the Leasing Group	(549.7)	(446.2)
Leasing Group | Wholly-owned subsidiaries
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	3.5	5.7
Property, plant, and equipment, net	2,964.6	2,698.7
Restricted cash	183.6	165.4
Debt:
Total debt	1,356.9	1,498.6
Net deferred tax liabilities	671.9	671.1
Leasing Group | Wholly-owned subsidiaries | Recourse
Debt:
Recourse	42.2	94.4
Less: unamortized discount	0	0
Total debt	42.2	94.4
Leasing Group | Wholly-owned subsidiaries | Non-recourse
Debt:
Non-recourse	1,314.7	1,404.2
Less: non-recourse debt owned by Trinity		0
Leasing Group | Partially-owned subsidiaries
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	0	0
Property, plant, and equipment, net	1,685.1	1,507.2
Restricted cash	77.1	57.8
Debt:
Total debt	1,256.1	1,192.7
Net deferred tax liabilities	0	5.4
Leasing Group | Partially-owned subsidiaries | Recourse
Debt:
Recourse	0	0
Less: unamortized discount	0	0
Total debt	0	0
Leasing Group | Partially-owned subsidiaries | Non-recourse
Debt:
Non-recourse	1,256.1	1,301.5
Less: non-recourse debt owned by Trinity		(108.8)
Manufacturing/ Corporate
Consolidating Financial Information
Cash, cash equivalents, and short-term marketable securities	574.7	567.3
Property, plant, and equipment, net	670.6	539.3
Restricted cash	0	0
Debt:
Total debt	376.8	363.7
Net deferred tax liabilities	(32.5)	(120.7)
Manufacturing/ Corporate | Recourse
Debt:
Recourse	450.9	451.2
Less: unamortized discount	(74.1)	(87.5)
Total debt	376.8	363.7
Manufacturing/ Corporate | Non-recourse
Debt:
Non-recourse	0	0
Less: non-recourse debt owned by Trinity		$ 0