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Share Capital (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of share capital, reserves and other equity interest [Abstract] |
Schedule of Common Stock Outstanding Roll Forward |
| Number of Shares | Amount
Outstanding at December 31, 2018 | 391,250,203 |  | $3,705.2 |
Shares issued through: |  |
Share-based compensation plans | 1,555,989 |  | 9.5 |
Shares repurchased and cancelled | (2,748,352) |  | (26.1) |
Exercise of warrants | 45 |  | — |
Flow-through share financing | 1,132,169 |  | 5.9 |
Cancellation of unexchanged post-amalgamation shares | (119,237) |  | (1.2) |
Outstanding at December 31, 2019 | 391,070,817 |  | $3,693.3 |
Shares issued through: |  |
Share-based compensation plans | 1,653,361 |  | 10.3 |
Shares repurchased and cancelled (i) | (1,133,561) |  | (10.7) |
Dividend reinvestment plan and share purchase plan (ii) | 1,186,205 |  | 10.0 |
Outstanding at December 31, 2020 | 392,776,822 |  | $3,702.9 |
Disclosure of number and weighted average exercise prices of share options | The following is a continuity of the changes in the number of stock options outstanding:
| Number | Weighted average exercise price (CAD$)
Outstanding at December 31, 2018 | 6,655,455 |  | $7.38 |
Granted | 965,876 |  | 6.59 |
Exercised | (1,555,989) |  | 5.93 |
Expired | (1,600,080) |  | 10.52 |
Outstanding at December 31, 2019 | 4,465,262 |  | $6.59 |
Granted | 876,425 |  | 7.66 |
Exercised | (1,653,361) |  | 6.15 |
Expired | (211,747) |  | 11.02 |
Outstanding at December 31, 2020 | 3,476,579 |  | $6.80 |
Weighted average fair value assumptions used in the Black-Scholes valuation for stock options | The following table presents the weighted average fair value assumptions used in the Black-Scholes valuation:
For options granted in the year ended: | December 31, 2020 | December 31, 2019
Weighted average share price at grant date (CAD$) | $7.66 |  | $6.59 |
Risk-free rate | 1.07% - 1.62% | 1.32% - 1.68%
Expected dividend yield | 1.02 | % | 0.84 | %
Expected stock price volatility (based on historical volatility) | 52 | % | 54 | %
Expected life of option (months) | 42 - 84 | 42 - 84
Weighted average per share fair value of stock options granted (CAD$) | $3.27 |  | $2.95 |
Disclosure of number and weighted average remaining contractual life of outstanding share options | Stock options outstanding and exercisable as at December 31, 2020:
|  | Outstanding |  | Exercisable
Range of exercise prices (CAD$) |  | Number of options | Weighted average exercise price (CAD$) | Weighted average remaining contractual life (years) |  | Number of options | Weighted average exercise price (CAD$)
$3.01 - $5.00 |  | 560,000 |  | 3.75 |  | 2.05 |  | 560,000 |  | 3.75 |
$6.01 - $7.00 |  | 1,596,265 |  | 6.57 |  | 4.71 |  | 679,852 |  | 6.57 |
$7.01 - $8.00 |  | 809,184 |  | 7.62 |  | 6.02 |  | 291 |  | 7.07 |
$8.01 - $9.00 |  | 28,571 |  | 8.63 |  | 6.16 |  | — |  | — |
$9.01 - $10.00 |  | 482,559 |  | 9.62 |  | 3.18 |  | 482,559 |  | 9.62 |
|  | 3,476,579 |  | $6.80 |  | 4.39 |  | 1,722,702 |  | $6.51 |
Stock options outstanding and exercisable by range of exercise prices | Stock options outstanding and exercisable as at December 31, 2020:
|  | Outstanding |  | Exercisable
Range of exercise prices (CAD$) |  | Number of options | Weighted average exercise price (CAD$) | Weighted average remaining contractual life (years) |  | Number of options | Weighted average exercise price (CAD$)
$3.01 - $5.00 |  | 560,000 |  | 3.75 |  | 2.05 |  | 560,000 |  | 3.75 |
$6.01 - $7.00 |  | 1,596,265 |  | 6.57 |  | 4.71 |  | 679,852 |  | 6.57 |
$7.01 - $8.00 |  | 809,184 |  | 7.62 |  | 6.02 |  | 291 |  | 7.07 |
$8.01 - $9.00 |  | 28,571 |  | 8.63 |  | 6.16 |  | — |  | — |
$9.01 - $10.00 |  | 482,559 |  | 9.62 |  | 3.18 |  | 482,559 |  | 9.62 |
|  | 3,476,579 |  | $6.80 |  | 4.39 |  | 1,722,702 |  | $6.51 |
Continuity of the changes in the number of other long-term incentive plans (LTIP) outstanding | The following is a continuity of the changes in the number of other long-term incentive plans ("LTI") outstanding for the years ended December 31, 2020 and 2019:
| Restricted share units ("RSU") | Stock appreciation rights ("SAR") | Deferred share units ("DSU") | Performance share units ("PSU")
Outstanding units, December 31, 2018 | 1,567,696 |  | 509,192 |  | 645,413 |  | 983,441 |
Granted | 832,366 |  | — |  | 208,882 |  | 423,628 |
Forfeited | (305,300) |  | (309,566) |  | — |  | — |
Settled | (427,937) |  | (108,319) |  | (165,868) |  | (324,916) |
Outstanding units, December 31, 2019 | 1,666,825 |  | 91,307 |  | 688,427 |  | 1,082,153 |
Granted | 851,453 |  | — |  | 176,418 |  | 475,623 |
Forfeited | (201,954) |  | (13,195) |  | — |  | (75,892) |
Settled | (347,733) |  | (78,112) |  | — |  | (247,866) |
Outstanding units, December 31, 2020 | 1,968,591 |  | — |  | 864,845 |  | 1,234,018 |
Schedule of Earnings (loss) per share |
|  | For the year ended
|  |  | December 31, 2020 | December 31, 2019
Net earnings |  |  | $144.2 |  | $96.1 |
Weighted average number of common shares outstanding (in thousands) |  |  | 391,675 |  | 390,160 |
Basic earnings per share |  |  | $0.37 |  | $0.25 |
Dilutive effect of potential common share equivalents (in thousands) |  |  | 3,187 |  | 3,267 |
Diluted weighted average number of common shares outstanding (in thousands) |  |  | 394,862 |  | 393,427 |
Diluted earnings per share |  |  | $0.37 |  | $0.24 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following table lists the equity securities that were excluded from the computation of diluted earnings per share as the exercise price related to these securities exceeded the average market price of the Company's common shares of CAD $10.87 and CAD $7.18 in 2019.
|  | For the years ended December 31,
(in thousands) |  |  | 2020 | 2019
Stock options |  |  | — |  | 1,420 |

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