Railcar Leasing and Management Services Group (Details Textual) (USD $) In Millions, unless otherwise specified				1 Months Ended	9 Months Ended
	Sep. 30, 2012		Dec. 31, 2011	Jul. 31, 2011 TRIP Holdings	Sep. 30, 2012 Leasing Group	Sep. 30, 2012 Leasing Group Wholly-owned subsidiaries
Railcar Leasing and Management Services Group (Textual) [Abstract]
Maximum period that sale from lease fleet is recorded as revenue			1 year
Minimum period after which sale from lease fleet is recognized as net gain or loss			1 year
Period of lease contracts with third parties, range minimum					1 year
Period of lease contracts with third parties, range maximum					20 years
Net book value of equipment pledged as collateral for leasing group debt						$ 2,534.8
Net book value of equipment securing capital lease obligations						49.9
Net book value of unpledged equipment						544.4
New debt issued to repay outstanding borrowings of TRIP Warehouse Loan				1,032.0
Equipment net pledged as collateral for securing capital lease obligations						1,127.1
Period of railcars leased from the Trusts under operating leases						22 years
Total assets	6,419.1	[1]	6,121.0			209.7
Cash						83.2
Railcars						94.0
Operating lease obligations guaranteed					$ 27.0

[1] (unaudited)