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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2014 | 155.6 |  |  | 18.9 |
Issued from treasury(i) | 1.3 |  |  | — |
Cancelled under NCIB or SIB (defined below) | (32.4 | ) |  | — |
Issued and outstanding at December 31, 2015 | 124.5 |  |  | 18.9 |
Issued from treasury(i) | 0.6 |  |  | — |
Cancelled under NCIB (defined below) | (3.2 | ) |  | — |
Issued and outstanding at December 31, 2016 | 121.9 |  |  | 18.9 |
Issued from treasury(i) | 2.8 |  |  | — |
Cancelled under NCIB | (1.9 | ) |  | — |
Other(ii) | 0.35 |  |  | (0.35 | )
Issued and outstanding at December 31, 2017 | 123.2 |  |  | 18.6 |
(i) | During 2017, we issued 1.7 million (2016 — 0.6 million; 2015 — 0.5 million) subordinate voting shares from treasury upon the exercise of employee stock options for aggregate cash proceeds of $13.6 (2016 — $4.1; 2015 — $3.9). We also issued 1.1 million (2016 — nil; 2015 — 0.8 million) subordinate voting shares from treasury with ascribed values of $9.8 (2016 — nil; 2015 — $6.5) upon the vesting of certain RSUs. We also settled RSUs and PSUs with subordinate voting shares purchased in the open market. Settlement of these awards is described below.
(ii) | During 2017, Onex Corporation converted 346,175 multiple voting shares into subordinate voting shares.
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 |
Granted | — |  |  | $ | — |
Exercised | (0.6 | ) |  | $ | 6.46 |
Forfeited/Expired | (0.2 | ) |  | $ | 9.99 |
Outstanding at December 31, 2016 | 2.1 |  |  | $ | 8.46 |
Granted | — |  |  | $ | — |
Exercised | (1.7 | ) |  | $ | 7.87 |
Forfeited/Expired | — |  |  | $ | — |
Outstanding at December 31, 2017 | 0.4 |  |  | $ | 12.14 |
Disclosure of Number and Weighted Average Remaining Contractual Life of Outstanding Share Options | The following stock options were outstanding as at December 31, 2017:
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) |  |
$6.51 - $8.24 |  | 0.1 |  | $7.78 |  | 3.5 |  | 0.1 |  | $7.78
$13.38 |  | 0.3 |  | $13.38 |  | 7.6 |  | 0.1 |  | $13.38
|  | 0.4 |  |  |  |  |  | 0.2 |  |
Disclosure of Range of Exercise Prices of Outstanding Share Options | The following stock options were outstanding as at December 31, 2017:
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) |  |
$6.51 - $8.24 |  | 0.1 |  | $7.78 |  | 3.5 |  | 0.1 |  | $7.78
$13.38 |  | 0.3 |  | $13.38 |  | 7.6 |  | 0.1 |  | $13.38
|  | 0.4 |  |  |  |  |  | 0.2 |  |
Disclosure of Grant Date Fair Value Using the Black-Scholes Option Pricing Model | We determined the grant date fair value of the stock options using the Black-Scholes option pricing model with the following weighted average assumptions for the years indicated below:
| Year ended December 31
| 2015 |  | 2016 (1) |  | 2017 (1)
Risk-free interest rate | 1.6% |  | N/A |  | N/A
Expected volatility of the market price of our shares | 35% |  | N/A |  | N/A
Expected option life (in years) | 5.5 |  | N/A |  | N/A
Weighted average fair value of options granted | $4.68 |  | N/A |  | N/A
(1) | No stock options were granted in 2016 or 2017.
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 |

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