Derivative Instruments (Details 1) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Interest Rate Locks, 2005 to 2006 [Member]
Interest rate hedges effect on interest expense - increase/(decrease)
Effect on interest expense - increase/(decrease)	$ (0.1)	$ (0.1)	$ (0.3)	$ (0.3)
Expected effect during next twelve months	(0.3)		(0.3)
Interest Rate Locks, 2006 to 2007 [Member]
Interest rate hedges effect on interest expense - increase/(decrease)
Effect on interest expense - increase/(decrease)	0.9	0.9	2.7	2.8
Expected effect during next twelve months	3.4		3.4
Interest Rate Locks, TRIP Holdings [Member]
Interest rate hedges effect on interest expense - increase/(decrease)
Effect on interest expense - increase/(decrease)	1.8	7.2	15.9	22.0
Expected effect during next twelve months	6.0		6.0
Interest Rate Swap, TILC Warehouse [Member]
Interest rate hedges effect on interest expense - increase/(decrease)
Effect on interest expense - increase/(decrease)		0.1		0.5
Interest Rate Swap TRIP Rail Master Funding Secured Railcar Equipment Notes [Member]
Interest rate hedges effect on interest expense - increase/(decrease)
Effect on interest expense - increase/(decrease)	0.5		0.5
Expected effect during next twelve months	1.8		1.8
Interest Rate Swap, 2008 Debt Issuance [Member]
Interest rate hedges effect on interest expense - increase/(decrease)
Effect on interest expense - increase/(decrease)	4.6	4.5	14.3	15.2
Expected effect during next twelve months	$ 17.6		$ 17.6