Earnings Per Share

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share ("EPS")

There are no adjustments required to be made to net income for purposes of computing basic and diluted EPS. The average number of common shares outstanding is reconciled to those used in the basic and diluted EPS computations as follows:

	Three Months Ended June 30		Six Months Ended June 30
(Millions of shares)	2012	2011	2012	2011
Average shares outstanding	393.6	393.1	393.7	397.5
Participating securities	—	0.2	—	0.6
Basic	393.6	393.3	393.7	398.1
Dilutive effect of stock options	1.8	1.6	1.9	1.5
Dilutive effect of restricted share and restricted share unit awards	1.1	1.1	1.2	1.1
Diluted	396.5	396.0	396.8	400.7

Outstanding options during the three and six month periods ended June 30, 2012 of 0.9 million and 0.4 million, respectively, and during the three and six month periods ended June 30, 2011 of 4.3 million and 4.5 million, respectively, were not included in the computation of diluted EPS mainly because the exercise prices of the options were greater than the average market price of the common shares during the periods.

The number of common shares outstanding as of June 30, 2012 and 2011 was 394.6 million and 392.2 million, respectively.