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Net Income Attributable to Trinity industries, Inc. Per Common Share (Tables)
6 Months Ended
Jun. 30, 2011
Net Income Per Common Share (Tables) [Abstract]  
Computation of basic and diluted net income attributable to Trinity Industries, Inc
                                                 
    Three Months Ended     Three Months Ended  
    June 30, 2011     June 30, 2010  
            (in millions, except per share amounts)        
    Income     Average             Income     Average        
    (Loss)     Shares     EPS     (Loss)     Shares     EPS  
Net income attributable to Trinity Industries, Inc.
  $ 30.0                     $ 18.4                  
Unvested restricted share participation
    (1.0 )                     (0.6 )                
 
                                           
Net income attributable to Trinity Industries, Inc. — basic
    29.0       77.4     $ 0.37       17.8       76.7     $ 0.23  
 
                                           
Effect of dilutive securities:
                                               
Stock options
          0.3                     0.2          
 
                                       
Net income attributable to Trinity Industries, Inc. — diluted
  $ 29.0       77.7     $ 0.37     $ 17.8       76.9     $ 0.23  
 
                                   
                                                 
    Six Months Ended     Six Months Ended  
    June 30, 2011     June 30, 2010  
            (in millions, except per share amounts)        
    Income     Average             Income     Average        
    (Loss)     Shares     EPS     (Loss)     Shares     EPS  
Net income attributable to Trinity Industries, Inc.
  $ 54.2                     $ 20.4                  
Unvested restricted share participation
    (1.9 )                     (0.7 )                
 
                                           
Net income attributable to Trinity Industries, Inc. — basic
    52.3       77.2     $ 0.68       19.7       76.6     $ 0.26  
 
                                           
Effect of dilutive securities:
                                               
Stock options
          0.3                     0.1          
 
                                       
Net income attributable to Trinity Industries, Inc. — diluted
  $ 52.3       77.5     $ 0.67     $ 19.7       76.7     $ 0.26