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Capital Stock - Additional Information (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 29, 2021 $ / shares shares | Dec. 31, 2020 USD ($) vote $ / shares shares | Nov. 30, 2018 shares | Nov. 23, 2021 shares | Dec. 31, 2020 USD ($) vote shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) $ / shares shares | Nov. 19, 2020 shares | Jan. 29, 2020 shares | Dec. 31, 2017 shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) |  |  |  |  | 0 | 0 |  |  |  |
Performance period |  |  |  |  | 3 years |  |  |  |  |
Expense reversal to reflect reduction in estimated PSUs expected to vest | $ |  |  |  |  | $ 8.4 |  |  |  |  |
Accrual for repurchase of stock under automatic share purchase plan | $ |  | $ 15.0 |  |  | 15.0 |  |  |  |  |
Aggregate cost of SVS repurchased for cancellation | $ |  |  |  |  | $ 0.1 | $ 67.3 | $ 75.5 |  |  |
DSUs |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Conversion rate, numerator (in shares) |  |  |  |  | 1 |  |  |  |  |
Options |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |  |  |  |
PSUs |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  |  |  |
Percentage of shares vested dependent on performance achievements (percent) |  |  |  |  | 100.00% |  |  |  |  |
Premium used in estimating grant date fair value (percent) |  |  |  |  | 112.00% | 102.00% | 106.00% |  |  |
RSUs |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Conversion rate, numerator (in shares) |  |  |  |  | 1 |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  |  |  |
Bottom of range | PSUs |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Percentage of shares vested dependent on performance achievements (percent) |  |  |  |  | 0.00% |  |  |  |  |
Top of range | PSUs |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Percentage of shares vested dependent on performance achievements (percent) |  |  |  |  | 200.00% |  |  |  |  |
SVS |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Subordinate voting shares, number of votes per share | vote |  | 1 |  |  | 1 |  |  |  |  |
Conversion rate, numerator (in shares) |  |  |  |  | 1 |  |  |  |  |
Conversion rate, denominator (in shares) |  |  |  |  | 1 |  |  |  |  |
Number of shares issued (in shares) |  | 110,500,000 |  |  | 110,500,000 | 110,200,000 | 117,700,000 |  |  | 123,200,000
Number of SVS repurchased for cancellation (in millions) (in shares) |  |  |  |  | 6,200.0000 | 8,300,000 | 6,800,000 |  |  |
Number of shares of SVS holder of vested PSU or RSU unit is entitled to (in shares) |  | 1 |  |  | 1 |  |  |  |  |
SVS | LTIP |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  | 29,000,000.0 |  |  |  |  |
Shares remaining in reserve for issuance (in shares) |  | 10,000,000.0 |  |  | 10,000,000.0 |  |  |  |  |
SVS | ASPP |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Accrual for repurchase of stock under automatic share purchase plan | $ |  | $ 15.0 |  |  | $ 15.0 |  |  |  |  |
SVS | 2020 NCIB |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Percentage of public float |  |  |  |  |  |  |  | 10.00% |  |
Percentage of total SVS and MVS outstanding |  |  |  |  |  |  |  | 7.00% |  |
SVS repurchase allowance per day (in shares) |  |  |  |  |  |  |  | 100,000 |  |
Number of SVS repurchased for cancellation (in millions) (in shares) |  | 6,200 |  |  |  |  |  |  |  |
Share price | $ / shares |  | $ 7.45 |  |  |  |  |  |  |  |
Aggregate cost of SVS repurchased for cancellation | $ |  | $ 0.1 |  |  |  |  |  |  |  |
SVS | 2017 NCIB |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  | 10,500,000 |  |  |  |  |  |  |
Number of SVS repurchased for cancellation (in millions) (in shares) |  |  |  |  |  |  | 6,800,000 |  |  |
Share price | $ / shares |  |  |  |  |  |  | $ 11.10 |  |  |
Aggregate cost of SVS repurchased for cancellation | $ |  |  |  |  |  |  | $ 75.5 |  |  |
Multiple voting shares |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Subordinate voting shares, number of votes per share | vote |  | 25 |  |  | 25 |  |  |  |  |
Number of shares issued (in shares) |  | 18,600,000 |  |  | 18,600,000 | 18,600,000 | 18,600,000 |  |  | 18,600,000
Number of SVS repurchased for cancellation (in millions) (in shares) |  |  |  |  | 0 | 0 | 0 |  |  |
Preferred shares |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  | 0 |  |  | 0 |  |  |  |  |
Purchase of shares for cancellation | SVS | Top of range | ASPP | Forecast |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) | 2,000,000 |  |  |  |  |  |  |  |  |
Share price | $ / shares | $ 7.50 |  |  |  |  |  |  |  |  |
Purchase of shares for cancellation | SVS | 2020 NCIB |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  | 9,000,000.0 |  |  |  |  |  |
Purchase of shares for cancellation | SVS | ASPP |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of SVS repurchased for cancellation (in millions) (in shares) | 0 |  |  |  |  |  |  |  |  |
Retirement of the chairman of the board of directors | Other related parties | Mr. William A. Etherington | DSUs |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares owned by Mr. Etherington (in shares) |  |  |  |  |  |  |  |  | 475,000 |

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