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Debt Narrative - Debt and Credit Facilities - Railcar (Details) - Railcar Segment [Member] - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Dec. 30, 2015
Debt Instrument [Line Items]      
Railcars pledged as collateral $ 558 $ 564  
ARI Revolving Loan      
Debt Instrument [Line Items]      
Line of credit facility borrowing capacity     $ 200
Line of credit facility amount outstanding   $ 100  
Line of credit facility unused borrowing availability $ 200