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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Calculation Of Earnings Per Share
The calculation of earnings per share is as follows:
In millions, except per share data
Net Income
Attributable to
Common Shareholders
 
Weighted Average Number of Shares
 
Per Share Amount
For the three months ended September 30, 2012:
 
 
 
 
 
Basic earnings per share

$170.6

 
451.3

 

$0.38

Dilutive effect of share-based awards
—

 
1.5

 
—

Diluted earnings per share

$170.6

 
452.8

 

$0.38

For the three months ended September 30, 2011:
 
 
 
 
 
Basic earnings per share

$166.9

 
459.5

 

$0.36

Dilutive effect of share-based awards
—

 
1.5

 
—

Diluted earnings per share

$166.9

 
461.0

 

$0.36

 
 
 
 
 
 
In millions, except per share data
Net Income
Attributable to
Common Shareholders
 
Weighted Average Number of Shares
 
Per Share Amount
For the nine months ended September 30, 2012:
 
 
 
 
 
Basic earnings per share

$518.4

 
453.1

 

$1.14

Dilutive effect of share-based awards
—

 
1.5

 
—

Diluted earnings per share

$518.4

 
454.6

 

$1.14

For the nine months ended September 30, 2011:
 
 
 
 
 
Basic earnings per share

$527.4

 
464.9

 

$1.13

Dilutive effect of share-based awards
—

 
1.9

 
—

Diluted earnings per share

$527.4

 
466.8

 

$1.13