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Stockholders' Equity and Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2011
Earnings Per Share, Basic and Diluted [Abstract]  
Net Income Per Common Share
Net income per common share is determined as follows:
 
Year Ended December 31
 
2011
 
2010
 
2009
 
(in millions of dollars, except share data)
Numerator
 
 
 
 
 
Net Income
$
235.4

 
$
886.1

 
$
852.6

 
 
 
 
 
 
Denominator (000s)
 
 
 
 
 
Weighted Average Common Shares - Basic
302,399.8

 
325,839.0

 
331,266.2

Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards
1,171.2

 
1,382.1

 
870.0

Weighted Average Common Shares - Assuming Dilution
303,571.0

 
327,221.1

 
332,136.2

 
 
 
 
 
 
Net Income Per Common Share
 
 
 
 
 
Basic
$
0.78

 
$
2.72

 
$
2.57

Assuming Dilution
$
0.78

 
$
2.71

 
$
2.57