Railcar Leasing and Management Services Group (Details Textual) (USD $) In Millions				1 Months Ended		9 Months Ended		1 Months Ended
	Sep. 30, 2011		Dec. 31, 2010	Jul. 31, 2011 TRIP Holdings [Member] Leasing Group [Member]	Sep. 30, 2011 Wholly Owned Subsidiaries [Member] Leasing Group [Member]	Sep. 30, 2011 Wholly Owned Subsidiaries [Member] Leasing Group [Member] Wholly Owned Subsidiaries Lessee [Member]	Sep. 30, 2011 Leasing Group [Member]	Jul. 31, 2011 TRIP Holdings [Member]
Railcar Leasing and Management Services Group (Textual) [Abstract]
Period of lease contracts with third parties, range minimum							1 year
Period of lease contracts with third parties, range maximum							20 years
Equipment pledged as collateral for Leasing Group debt					$ 2,442.8
Equipment net pledged as collateral for securing capital lease obligations					51.3
New debt issued to repay outstanding borrowings of TRIP Warehouse Loan				1,032.0				1,032.0
Period of railcars leased from the Trusts under operating leases						22 years
Total assets	6,015.1	[1]	5,760.0			222.9
Cash						91.7
Railcars						98.3
Railcar Leasing and Management Services Group Additional (Textual) [Abstract]
Operating lease obligations guaranteed	$ 31.2

[1] Unaudited