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Earnings Per Common Share
 9 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Earnings Per Common Share
Earnings Per Common Share

Basic net income attributable to Trinity Industries, Inc. per common share is computed by dividing net income attributable to Trinity remaining after allocation to unvested restricted shares by the weighted average number of basic common shares outstanding for the period. Except when the effect would be antidilutive, the calculation of diluted net income attributable to Trinity per common share includes the net impact of unvested restricted shares and shares that could be issued under outstanding stock options. Total weighted average restricted shares and antidilutive stock options were 3.3 million shares and 3.2 million shares for the three and nine month periods ended September 30, 2012, respectively. Total weighted average restricted shares and antidilutive stock options were 2.9 million shares for the three and nine month periods ended September 30, 2011.

The computation of basic and diluted net income attributable to Trinity Industries, Inc. is as follows:
 
 
Three Months Ended
September 30, 2012
 
Three Months Ended
September 30, 2011
 
 
(in millions, except per share amounts)
 
 
Income
(Loss)
 
Average
Shares
 
EPS
 
Income
(Loss)
 
Average
Shares
 
EPS
Net income attributable to Trinity Industries, Inc.
 
$
63.2

 
 
 
 
 
$
31.9

 
 
 
 
Unvested restricted share participation
 
(2.1
)
 
 
 
 
 
(1.0
)
 
 
 
 
Net income attributable to Trinity Industries, Inc. – basic
 
61.1

 
76.5

 
$
0.80

 
30.9

 
77.7

 
$
0.40

Effect of dilutive securities:
 
 
 
 
 
 
 
 
 
 
 
 
Stock options
 
—

 
0.2

 
 
 
—

 
0.2

 
 
Net income attributable to Trinity Industries, Inc. – diluted
 
$
61.1

 
76.7

 
$
0.80

 
$
30.9

 
77.9

 
$
0.40

 
 
 
Nine Months Ended
September 30, 2012
 
Nine Months Ended
September 30, 2011
 
 
(in millions, except per share amounts)
 
 
Income
(Loss)
 
Average
Shares
 
EPS
 
Income
(Loss)
 
Average
Shares
 
EPS
Net income attributable to Trinity Industries, Inc.
 
$
183.9

 
 
 
 
 
$
86.1

 
 
 
 
Unvested restricted share participation
 
(6.1
)
 
 
 
 
 
(2.9
)
 
 
 
 
Net income attributable to Trinity Industries, Inc. – basic
 
177.8

 
77.3

 
$
2.30

 
83.2

 
77.4

 
$
1.07

Effect of dilutive securities:
 
 
 
 
 
 
 
 
 
 
 
 
Stock options
 
—

 
0.2

 
 
 
—

 
0.3

 
 
Net income attributable to Trinity Industries, Inc. – diluted
 
$
177.8

 
77.5

 
$
2.29

 
$
83.2

 
77.7

 
$
1.07