Derivative Instruments (Details Textual) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Designated as hedging instrument Expired hedges 2006 secured railcar equipment notes		Mar. 31, 2013 Designated as hedging instrument Expired hedges Promissory notes		Mar. 31, 2013 Designated as hedging instrument Expired hedges TRIP Holdings warehouse loan		Mar. 31, 2013 Designated as hedging instrument Open hedges Promissory notes		Mar. 31, 2013 Designated as hedging instrument Open hedges TRIP Master Funding secured railcar equipment notes		Jul. 31, 2011 Designated as hedging instrument Open hedges TRIP Master Funding secured railcar equipment notes	Mar. 31, 2013 Designated as hedging instrument Foreign exchange hedges
Derivative Instruments (Textual) [Abstract]
Interest rate swap, notional amount			$ 200.0		$ 370.0		$ 788.5		$ 435.7		$ 75.6		$ 94.1
Changes in fair value of cash flow hedges which is being amortized to income			4.5		(24.5)
Expected effect during next twelve months			(0.3)	[1]	3.1	[1]	5.3	[1]	16.3	[1]	1.7	[1]
Remaining AOCL balance of foreign exchange hedges with quarterly maturities	$ (34.1)	$ (34.8)	$ 1.9		$ (6.4)		$ (24.1)		$ (31.1)		$ (3.2)			$ 0

[1] Based on the fair value of open hedges as of March 31, 2013