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EARNINGS (LOSS) PER SHARE | 12 Months Ended
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Dec. 31, 2021
Earnings per share [abstract] |
Earnings (Loss) Per Share | Earnings (Loss) Per Share (a)Basic earnings (loss) per share computation
|  | Years ended December 31,
|  |  | 2021 | 2020
Numerator |  |  |  |
Net earnings (loss) from continuing operations attributable to equity holders |  |  | $ | (254.4) |  | $ | 38.5 |
Net earnings from discontinued operations attributable to equity holders |  |  | $ | — |  | $ | 4.1 |
Net earnings (loss) attributable to equity holders |  |  | $ | (254.4) |  | $ | 42.6 |
Denominator (in millions) |  |  |  |
Weighted average number of common shares (basic) |  |  | 476.5 |  | 472.6 |
Basic earnings (loss) from continuing operations per share attributable to equity holders |  |  | $ | (0.53) |  | $ | 0.08 |
Basic earnings from discontinued operations per share attributable to equity holders |  |  | $ | — |  | $ | 0.01 |
Basic earnings (loss) per share attributable to equity holders |  |  | $ | (0.53) |  | $ | 0.09 |
(b)Diluted earnings (loss) per share computation
| Years ended December 31,
| 2021 | 2020
Denominator (in millions) |  |
Weighted average number of common shares (basic) | 476.5 |  | 472.6 |
Dilutive effect of options 1 | — |  | 0.4 |
Dilutive effect of share units 1 | — |  | 5.0 |
Weighted average number of common shares (diluted) | 476.5 |  | 478.0 |
Diluted earnings (loss) from continuing operations per share attributable to equity holders | $ | (0.53) |  | $ | 0.08 |
Diluted earnings from discontinued operations per share attributable to equity holders | $ | — |  | $ | 0.01 |
Diluted earnings (loss) per share attributable to equity holders | $ | (0.53) |  | $ | 0.09 |
1.The impact of outstanding potentially dilutive instruments is excluded from the diluted share calculation for loss per share amounts as they are anti-dilutive. Equity instruments excluded from the computation of diluted earnings (loss) per share which could be dilutive in the future were as follows:
|  | Years ended December 31,
(in millions) |  |  | 2021 | 2020
Options |  |  | 5.1 |  | 3.3 |
Share units |  |  | 6.9 |  | — |
|  |  | 12.0 |  | 3.3 |

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