Railcar Leasing and Management Services Group (Details Textual) (USD $) In Millions, unless otherwise specified						12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009 Recourse Term loan	Dec. 31, 2009 Recourse Capital lease obligations	Jul. 31, 2011 TRIP Holdings	Dec. 31, 2012 Leasing Group	Dec. 31, 2009 Leasing Group Recourse Term loan	Dec. 31, 2009 Leasing Group Recourse Capital lease obligations	Dec. 31, 2012 Leasing Group Wholly-owned subsidiaries	Dec. 31, 2012 Leasing Group TRIP Holdings	Jul. 31, 2011 Leasing Group TRIP Holdings
Railcar Leasing and Management Services Group (Textual) [Abstract]
Period of lease contracts with third parties, range minimum (in years)						1 year
Period of lease contracts with third parties, range maximum (in years)						20 years
Maturity period (in years)			7 years				7 years
Face value of debt instrument			$ 61.0		$ 1,032.0		$ 61.0				$ 1,032.0
Capital lease obligations				56.6				56.6
Net book value of equipment pledged as collateral for leasing group debt									2,660.5	1,118.6
Net book value of equipment securing capital lease obligations									49.6
Net book value of unpledged equipment									450.2
Period of railcars leased from the Trusts under operating leases (in years)									22 years
First year to exercise the option to purchase at a predetermined fixed price certain of the railcars from the Trusts									2016
Second year to exercise the option to purchase at a predetermined fixed price certain of the railcars from the Trusts									2019
First year to exercise the option to purchase railcars at the end of the respective lease agreements									2023
Second year to exercise the option to purchase railcars at the end of the respective lease agreements									2026
Third year to exercise the option to purchase railcars at the end of the respective lease agreements									2027
Assets	6,669.9	6,121.0							208.7
Cash									83.2
Railcars									93.0
Operating lease obligations guaranteed						$ 26.1