Railcar Leasing and Management Services Group (Details Textual) (USD $) In Millions, unless otherwise specified					6 Months Ended				6 Months Ended
	Jun. 30, 2013		Dec. 31, 2012	Jun. 30, 2013 Leasing Group	Jun. 30, 2013 Leasing Group Wholly-owned subsidiaries	Jun. 30, 2013 Leasing Group TRIP Holdings	Jun. 30, 2013 Leasing Group RIV 2013	Jun. 30, 2013 Leasing Group Wholly-owned qualified subsidiaries for leasing railcars from trusts	Jun. 30, 2013 Leasing Group Minimum	Jun. 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					$ 2,114.1	$ 1,100.8	$ 425.2
Net book value of equipment securing capital lease obligations					48.1
Net book value of unpledged equipment					855.1
Period of railcars leased from the Trusts under operating leases (in years)					22 years
Assets	6,900.7	[1]	6,669.9					207.3
Cash								83.1
Railcars								91.0
Operating lease obligations guaranteed by Trinity Industries, Inc. and certain subsidiaries				$ 24.0

[1] (unaudited)