Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Interest Rate Locks, 2005 to 2006 [Member]	Sep. 30, 2011 Interest Rate Locks, 2006 to 2007 [Member]	Sep. 30, 2011 Interest Rate Locks, TRIP Holdings [Member]	Sep. 30, 2011 Interest Rate Swap TRIP Rail Master Funding Secured Railcar Equipment Notes [Member]	Jul. 31, 2011 Interest Rate Swap TRIP Rail Master Funding Secured Railcar Equipment Notes [Member]	Sep. 30, 2011 Interest Rate Swap, 2008 Debt Issuance [Member]
Interest rate hedges included in balance sheet
Notional Amount			$ 200.0	$ 370.0	$ 788.5	$ 92.3	$ 94.1	$ 482.1
Interest Rate			4.87%	5.34%	3.60%	2.62%		4.13%
Liability			0	0	0	4.7		52.4
AOCL loss/(income)	(55.0)	(36.3)	(2.4)	11.4	24.2	2.6		50.9
Noncontrolling Interest			$ 0	$ 0	$ 18.2	$ 2.0		$ 0

Other comprehensive income derivatives qualifying as hedges after tax portion attributable to noncontrolling interest.

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- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

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- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

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- Definition

Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

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-Glossary Notional Amount

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