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Fair Value Accounting (Tables)
6 Months Ended
Jun. 30, 2011
Fair Value Accounting (Tables) [Abstract]  
Assets and liabilities measured at fair value on recurring basis
                                 
    Fair Value Measurement as of June 30, 2011  
    (in millions)  
    Level 1     Level 2     Level 3     Total  
Assets:
                               
Cash equivalents
  $ 155.4     $     $     $ 155.4  
Short-term marketable securities
    42.0                   42.0  
Restricted cash
    205.3                   205.3  
Fuel derivative instruments (1)
          0.4             0.4  
 
                       
Total assets
  $ 402.7     $ 0.4     $     $ 403.1  
 
                       
Liabilities:
                               
Interest rate hedges (2)
                               
Wholly-owned subsidiary
  $     $ 45.7     $     $ 45.7  
TRIP Holdings
          47.0             47.0  
 
                       
Total liabilities
  $     $ 92.7     $     $ 92.7  
 
                       
                                 
    Fair Value Measurement as of December 31, 2010  
    (in millions)  
    Level 1     Level 2     Level 3     Total  
Assets:
                               
Cash equivalents
  $ 286.0     $     $     $ 286.0  
Short-term marketable securities
    158.0                   158.0  
Restricted cash
    207.1                   207.1  
Fuel derivative instruments (1)
          0.1             0.1  
 
                       
Total assets
  $ 651.1     $ 0.1     $     $ 651.2  
 
                       
Liabilities:
                               
Interest rate hedges (2)
                               
Wholly-owned subsidiary
  $     $ 45.7     $     $ 45.7  
TRIP Holdings
          48.3             48.3  
 
                       
Total liabilities
  $     $ 94.0     $     $ 94.0  
 
                       
(1)   Included in other assets on the consolidated balance sheet.
 
(2)   Included in accrued liabilities on the consolidated balance sheet.
Carrying amounts and estimated fair values of long-term debt
                                 
    June 30, 2011   December 31, 2010  
    Carrying
Value
    Estimated
Fair Value
    Carrying
Value
    Estimated
Fair Value
 
            (in millions)          
Recourse:
                               
Convertible subordinated notes
  $ 450.0     $ 471.4     $ 450.0     $ 448.3  
Less: unamortized discount
    (105.6 )             (111.1 )        
 
                           
 
    344.4               338.9          
Capital lease obligations
    49.9       49.9       51.2       51.2  
Term loan
    56.1       57.4       57.4       54.2  
Other
    4.9       4.9       2.8       2.8  
 
                       
 
    455.3       583.6       450.3       556.5  
Non-recourse:
                               
2006 secured railcar equipment notes
    275.5       290.3       283.2       302.8  
Promissory notes
    478.2       462.1       493.8       482.2  
2009 secured railcar equipment notes
    223.6       236.2       229.2       256.1  
2010 secured railcar equipment notes
    360.7       342.1       367.1       345.5  
TILC warehouse facility
    130.0       130.0       80.2       80.2  
TRIP warehouse loan
    963.3       956.4       1,003.9       994.0  
 
                       
 
    2,431.3       2,417.1       2,457.4       2,460.8  
 
                       
Total
  $ 2,886.6     $ 3,000.7     $ 2,907.7     $ 3,017.3