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Earnings Per Share (EPS) (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Basic and Diluted Shares
The following table summarizes the weighted-average number of ordinary shares outstanding for basic and diluted earnings per share calculations for the three months ended March 31:
 
Three months ended
In millions
2017
 
2016
Weighted-average number of basic shares
259.4

 
259.4

Shares issuable under incentive stock plans
3.2

 
1.9

Weighted-average number of diluted shares
262.6

 
261.3

Anti-dilutive shares
1.6

 
3.9