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Weighted Average Number of Shares Diluted | 12 Months Ended
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Dec. 31, 2018
Earnings per share [abstract] |
Weighted Average Number of Shares Diluted | WEIGHTED AVERAGE NUMBER OF SHARES DILUTED (in millions):
| 2016 |  | 2017 |  | 2018
Weighted average number of shares (basic) | 141.8 |  |  | 143.1 |  |  | 139.4 |
Dilutive effect of outstanding awards under stock-based compensation plans | 2.1 |  |  | 2.1 |  |  | 1.2 |
Weighted average number of shares (diluted) | 143.9 |  |  | 145.2 |  |  | 140.6 |
For the year ended December 31, 2018, we excluded 0.3 million of stock options (year ended December 31, 2017 — 0.2 million; year ended December 31, 2016 — 0.3 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 subordinate voting shares and our multiple voting shares taken collectively.

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