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Investment in TRIP Holdings (Details Textual) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Jul. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investment in TRIP Holdings (Textual) [Abstract]        
Noncontrolling interest in charge to retained earnings   $ 84.5 $ 80.9  
Ownership interest purchased     28.6  
Ownership percentage in TRIP Holdings   57.00%    
Investment in Subsidiary (Additional Textual) [Abstract]        
Railcars purchased by TRIP from the Company   1,284.7    
Number of other third-party equity investors in TRIP Holdings   3    
Expense from the recognition of certain equity repurchase agreement with an investor in trip holding   2.4    
Controlling interest increase from stock issuance     10.3  
Noncontrolling interest     45.3  
TRIP Holdings [Member]
       
Investment in TRIP Holdings (Textual) [Abstract]        
Remaining equity commitment by Trinity   0    
Remaining equity commitment outstanding   0    
Additional borrowings debt instrument increase additional borrowings 1,032.0      
Charge to retained earnings, net     105.4  
Tax benefit on charge to retained earnings     57.7  
Noncontrolling interest in charge to retained earnings     129.9  
Payments to TILC from TRIP Holdings and TRIP leasing   4.3 3.7 4.5
Percentage of the equity investor's net investment specified as amount payable to equity investor 90.00%      
Additional equity ownership to be acquired from the equity investor by the company if the option was exercised to its fullest extent 16.30%      
Percentage of the equity investor's net investment specified as amount payable to equity investor under certain limited circumstances 100.00%      
Ownership interest purchased     $ 28.6  
Ownership percentage in TRIP Holdings     29.00%