Railcar Leasing and Management Services Group (Details Textuals) (USD $) In Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010	Jun. 30, 2011		Jun. 30, 2010	Jul. 06, 2011	Dec. 31, 2010
Railcar Leasing and Management Services Group (Textuals) [Abstract]
Interest expense	$ 43.8		$ 45.3	$ 88.3		$ 91.0
Equipment, net	4,727.7	[1]		4,727.7	[1]			4,648.6
Additional borrowings debt instrument increase additional borrowings							1,032.0
Total assets of the Leasing group	5,876.7	[1]		5,876.7	[1]			5,760.0
Period of lease contracts with third parties, years				1 to 20
Equipment net pledged as collateral for securing capital lease obligations	51.7			51.7
Period of railcars leased from the Trusts under operating leases				22 years
Operating lease obligations guaranteed	32.2			32.2
Leasing Group [Member]
Railcar Leasing and Management Services Group (Textuals) [Abstract]
Interest expense	36.2		34.4	72.9		69.2
Rent expense	12.2		12.2	24.3		24.3
Equipment, net	2,243.7			2,243.7
Total assets of the Leasing group	224.0			224.0
Cash	91.3			91.3
Railcars	99.5			99.5
TRIP Holdings [Member]
Railcar Leasing and Management Services Group (Textuals) [Abstract]
Interest expense	10.8		11.8	22.3		23.6
Equipment, net	$ 1,166.6	[1]		$ 1,166.6	[1]			$ 1,191.8

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