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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Antidilutive Securities Excluded From Earnings per Share
Anti-dilutive shares, which could potentially dilute earnings per share in the future, are set forth below (in millions):
 
Three months ended March 31,
 
2019
 
2018
Share options and appreciation rights
1.4

 
1.5

P-Units, RSAs and RSUs
5.6

 
4.6

Total potentially dilutive shares
7.0

 
6.1