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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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 June 30, 2012:
 
 
 
 
 
Basic earnings per share

$153.9

 
453.8

 

$0.34

Dilutive effect of share-based awards
—

 
1.5

 
—

Diluted earnings per share

$153.9

 
455.3

 

$0.34

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

$183.0

 
465.5

 

$0.39

Dilutive effect of share-based awards
—

 
1.9

 
—

Diluted earnings per share

$183.0

 
467.4

 

$0.39

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

$347.8

 
454.0

 

$0.77

Dilutive effect of share-based awards
—

 
1.6

 
—

Diluted earnings per share

$347.8

 
455.6

 

$0.76

For the six months ended June 30, 2011:
 
 
 
 
 
Basic earnings per share

$360.5

 
467.7

 

$0.77

Dilutive effect of share-based awards
—

 
2.0

 
—

Diluted earnings per share

$360.5

 
469.7

 

$0.77