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Weighted Average Number of Shares Diluted
 12 Months Ended
Dec. 31, 2019
Earnings per share [abstract]  
Weighted Average Number of Shares Diluted
WEIGHTED AVERAGE NUMBER OF SHARES DILUTED (in millions):
 
2017
 
2018
 
2019
Weighted average number of shares (basic)
143.1

 
139.4

 
131.0

Dilutive effect of outstanding awards under SBC plans
2.1

 
1.2

 
0.8

Weighted average number of shares (diluted)
145.2

 
140.6

 
131.8


For the year ended December 31, 2019, we excluded 0.3 million stock options (year ended December 31, 2018 — 0.3 million; year ended December 31, 2017 — 0.2 million) from the diluted weighted average per share calculation as they were out-of-the-money. References to shares in this note 23 are to our SVS and MVS taken collectively.