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Earnings Per Share (EPS) (Tables)
 6 Months Ended
Jun. 30, 2018
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 and six months ended June 30:
 
Three months ended

Six months ended
In millions
2018
 
2017
 
2018
 
2017
Weighted-average number of basic shares
247.5

 
256.4

 
248.9

 
257.9

Shares issuable under incentive stock plans
2.6

 
3.3

 
2.7

 
3.2

Weighted-average number of diluted shares
250.1

 
259.7

 
251.6

 
261.1

Anti-dilutive shares
2.1

 
1.2

 
1.6

 
1.6