Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

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Derivative Instruments (Details Textual) - USD ($) $ in Millions	3 Months Ended	36 Months Ended
	Mar. 31, 2016	Dec. 31, 2008	Jul. 31, 2011	Dec. 31, 2006
Interest rate swap, Expired, TRIP Holdings warehouse loan
Derivative [Line Items]
Expected effect during next twelve months	$ 4.7
Fuel derivative instruments
Derivative [Line Items]
Derivative liabilities	0.6
Designated as hedging instrument \| Interest rate swap, Expired, 2006 secured railcar equipment notes
Derivative [Line Items]
Notional amount	200.0			$ 200.0
Changes in fair value of cash flow hedges which is being amortized to income (loss)	4.5
Derivative liabilities	0.0
Designated as hedging instrument \| Interest rate swap, Promissory notes
Derivative [Line Items]
Notional amount		$ 370.0
Changes in fair value of cash flow hedges which is being amortized to income (loss)		$ (24.5)
Designated as hedging instrument \| Interest rate swap, Expired, TRIP Holdings warehouse loan
Derivative [Line Items]
Notional amount	788.5
Derivative liabilities	$ 0.0
Designated as hedging instrument \| TRIP Master Funding secured railcar equipment notes (TRIP Holdings)
Derivative [Line Items]
Notional amount			$ 94.1