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Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Interest Rate Locks, 2005 to 2006 [Member]	Jun. 30, 2012 Interest Rate Locks, 2006 to 2007 [Member]	Jun. 30, 2012 Interest Rate Locks, TRIP Holdings [Member]	Jun. 30, 2012 Interest Rate Swap TRIP Master Funding Secured Railcar Equipment Notes [Member]	Jul. 31, 2011 Interest Rate Swap TRIP Master Funding Secured Railcar Equipment Notes [Member]	Jun. 30, 2012 Interest Rate Swap, 2008 Debt Issuance [Member]
Interest rate hedges included in balance sheet
Notional Amount			$ 200.0	$ 370.0	$ 788.5	$ 83.8	$ 94.1	$ 459.5
Interest Rate			4.87%	5.34%	3.60%	2.62%		4.13%
Liability						5.4		44.3
AOCL loss/(income)	42.3	46.2	(2.1)	8.9	21.7	3.0		42.9
Noncontrolling Interest					$ 16.3	$ 2.3

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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