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Earnings Per Share (EPS) (Details) - shares
shares in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of ordinary shares 96.0
The reconciliation of Ordinary shares is as follows:
In millions
Total
December 31, 2015
96.0

Shares issued under incentive plans
0.6

Repurchase of ordinary shares
(1.3
)
December 31, 2016
95.3

    
Weighted Average Number Diluted Shares Outstanding Adjustment   0.6    
Weighted-average number of basic shares   95.8 95.9 96.1
Shares issuable under incentive stock plans   1.1 1.0 1.1
Weighted-average number of diluted shares   96.9 96.9 97.2