Railcar Leasing and Management Services Group (Details Textual) (USD $) In Millions, unless otherwise specified								9 Months Ended
	Sep. 30, 2013		Dec. 31, 2012	Sep. 30, 2013 Leasing Group	Sep. 30, 2013 Leasing Group Wholly-owned subsidiaries	Sep. 30, 2013 Leasing Group TRIP Holdings	Sep. 30, 2013 Leasing Group TRL 2012	Sep. 30, 2013 Leasing Group Wholly-owned qualified subsidiaries for leasing railcars from trusts	Sep. 30, 2013 Leasing Group Minimum	Sep. 30, 2013 Leasing Group Maximum
Railcar Leasing and Management Services Group (Textual) [Abstract]
Period of lease contracts with third parties (in years)									1 year	20 years
Net book value of equipment pledged as collateral for leasing group debt					$ 2,063.0	$ 1,089.6	$ 666.7
Net book value of equipment securing capital lease obligations					47.7
Net book value of unpledged equipment					812.1
Period of railcars leased from the Trusts under operating leases (in years)								22 years
Assets	7,258.3	[1]	6,669.9					206.0
Cash								84.3
Railcars								88.7
Operating lease obligations guaranteed by Trinity Industries, Inc. and certain subsidiaries				$ 22.9

[1] (unaudited)