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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Average Common Shares Outstanding Basic and Diluted

The average number of common shares outstanding is reconciled to those used in the basic and diluted EPS computations as follows:

(Millions of shares)		2017			2016			2015
Basic		353.6			359.4			363.8
Dilutive effect of stock options and restricted share unit awards		2.3			2.3			2.5
Diluted		355.9			361.7			366.3

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