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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2018
Share Capital and Share-based Payment Arrangements [Abstract] |
Disclosure of Detailed Information About Capital Transactions |
Number of shares (in millions) | Subordinate Voting Shares |  | Multiple Voting Shares
Issued and outstanding at December 31, 2015 | 124.5 |  |  | 18.9 |
Issued from treasury(i) | 0.6 |  |  | — |
Cancelled under NCIB(ii) | (3.2 | ) |  | — |
Issued and outstanding at December 31, 2016 | 121.9 |  |  | 18.9 |
Issued from treasury(i) | 2.8 |  |  | — |
Cancelled under NCIB(ii) | (1.9 | ) |  | — |
Other(iii) | 0.35 |  |  | (0.35 | )
Issued and outstanding at December 31, 2017 | 123.2 |  |  | 18.6 |
Issued from treasury(i) | 1.3 |  |  | — |
Cancelled under NCIB(ii) | (6.8 | ) |  | — |
Issued and outstanding at December 31, 2018 | 117.7 |  |  | 18.6 |
(i) | During 2018, we issued 0.1 million (2017 — 1.7 million; 2016 — 0.6 million) subordinate voting shares from treasury upon the exercise of stock options for aggregate cash proceeds of $0.4 (2017 — $13.6; 2016 — $4.1). We also issued 1.2 million (2017 — 1.1 million; 2016 — nil) subordinate voting shares from treasury with ascribed values of $14.3 (2017 — $9.8; 2016 — nil) upon the vesting of certain RSUs and PSUs. We also settled RSUs and PSUs with subordinate voting shares purchased in the open market. Settlement of these awards is described below.
(ii) | NCIB stands for normal course issuer bid.
(iii) | During 2017, Onex Corporation converted 346,175 of our multiple voting shares into subordinate voting shares. Onex Corporation did not convert any multiple voting shares in 2016 or 2018.
Disclosure of Detailed Information About Stock Option Transactions | Stock option transactions were as follows for the years indicated:
| Number of Options |  | Weighted Average Exercise Price
| (in millions) |  |
Outstanding at January 1, 2016 | 2.9 |  |  | $ | 8.03 |
Exercised | (0.6 | ) |  | $ | 6.46 |
Forfeited/Expired | (0.2 | ) |  | $ | 9.99 |
Outstanding at December 31, 2016 | 2.1 |  |  | $ | 8.46 |
Exercised | (1.7 | ) |  | $ | 7.87 |
Outstanding at December 31, 2017 | 0.4 |  |  | $ | 12.14 |
Exercised | (0.1 | ) |  | $ | 6.20 |
Outstanding at December 31, 2018 | 0.3 |  |  | $ | 11.93 |
Disclosure of Number and Weighted Average Remaining Contractual Life of Outstanding Share Options | The following stock options were outstanding as at December 31, 2018:
Range of Exercise Prices |  | Outstanding Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Life of Outstanding Options |  | Exercisable Options |  | Weighted Average Exercise Price
|  | (in millions) |  |  |  | (years) |  | (in millions) |  |
$6.06 - $12.85 |  | 0.3 |  | $11.93 |  | 6.2 |  | 0.3 |  | $11.68
Disclosure of Range of Exercise Prices of Outstanding Share Options | The following stock options were outstanding as at December 31, 2018:
Range of Exercise Prices |  | Outstanding Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Life of Outstanding Options |  | Exercisable Options |  | Weighted Average Exercise Price
|  | (in millions) |  |  |  | (years) |  | (in millions) |  |
$6.06 - $12.85 |  | 0.3 |  | $11.93 |  | 6.2 |  | 0.3 |  | $11.68
Disclosure of Detailed Information About RSU Transactions | The following table outlines the RSU transactions during the years indicated, under each of the LTIP and CSUP.
Number of awards (in millions) | LTIP |  | CSUP |  | Total
Outstanding at January 1, 2016 | — |  |  | 3.5 |  |  | 3.5 |
Granted | 0.8 |  |  | 1.5 |  |  | 2.3 |
Settled | — |  |  | (1.9 | ) |  | (1.9 | )
Forfeited/Expired | — |  |  | (0.1 | ) |  | (0.1 | )
Outstanding at December 31, 2016 | 0.8 |  |  | 3.0 |  |  | 3.8 |
Granted | 1.4 |  |  | 0.5 |  |  | 1.9 |
Settled | (0.3 | ) |  | (2.0 | ) |  | (2.3 | )
Forfeited/Expired | (0.2 | ) |  | — |  |  | (0.2 | )
Outstanding at December 31, 2017 | 1.7 |  |  | 1.5 |  |  | 3.2 |
Granted | — |  |  | 2.6 |  |  | 2.6 |
Settled | (0.9 | ) |  | (0.9 | ) |  | (1.8 | )
Forfeited/Expired | (0.1 | ) |  | (0.1 | ) |  | (0.2 | )
Outstanding at December 31, 2018 | 0.7 |  |  | 3.1 |  |  | 3.8 |

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