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Capital Stock - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 29, 2024 shares | Oct. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) shares vote | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 12, 2023 shares | Jun. 30, 2023 shares | Dec. 08, 2022 shares | Jul. 31, 2022 shares | Apr. 30, 2022 shares | Dec. 31, 2020 USD ($) shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Employee SBC expense (note 12) | $ |  |  | $ 55.6 | $ 51.0 | $ 33.4 |  |  |  |  |  |
Risk free interest rate, share options granted |  |  | 1.09% |  |  |  |  |  |  |  |
Expected volatility, share options granted |  |  | 43.00% |  |  |  |  |  |  |  |
Option life, share options granted |  |  | 7 years |  |  |  |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) |  |  | 0 | 0 | 90,000.00 |  |  |  |  |  |
SBC cash settlement | $ |  |  | $ 66.7 | $ 0.0 | $ 0.0 |  |  |  |  |  |
Number of share options exercised in share-based payment arrangement |  |  | 20,000.00 | 20,000.00 | 20,000.00 |  |  |  |  |  |
DSUs |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Conversion rate, numerator (in shares) |  |  | 1 |  |  |  |  |  |  |  |
SBC cash settlement | $ |  | $ 9.2 |  |  |  |  |  |  |  |  |
DSUs | Eamon Ryan |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares owned (in shares) |  |  |  |  |  |  |  |  | 300,000 |  |
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] |  |  |  |  |  |  |  |  |  |  |
Employee SBC expense (note 12) | $ |  |  | $ 14.7 | $ 12.3 |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |  |  |  |
TSR and Monte Carlo simulation premium |  |  | 118.00% | 116.00% | 109.00% |  |  |  |  |  |
Award requisite service period |  |  | 3 years |  |  |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Conversion rate, numerator (in shares) |  |  | 1 |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |  |  |  |
RSUs | Eamon Ryan |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares owned (in shares) |  |  |  |  |  |  |  |  |  | 30,000.00 |
RSUs & PSUs |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
SBC cash settlement | $ |  |  | $ 49.8 |  |  |  |  |  |  |  |
Cash payment for withholding taxes | $ |  |  | $ 7.7 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Conversion rate, numerator (in shares) |  |  | 1 |  |  |  |  |  |  |  |
Conversion of MVS into SVS in connection with the Secondary Offerings (in shares) |  |  | 18,600,000 |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  | 119,000,000.0 | 103,000,000.0 | 106,100,000 |  |  |  |  |  | 110,500,000
Accrual for repurchase of stock under automatic share purchase plan | $ |  |  | $ 2.7 |  |  |  |  |  |  |  |
Number of SVS repurchased for cancellation (in millions) (in shares) |  |  | 2,700,000 | 3,140,000 | 4,400,000 |  |  |  |  |  |
SVS | LTIP |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Conversion rate, numerator (in shares) |  |  | 1 |  |  |  |  |  |  |  |
Conversion rate, denominator (in shares) |  |  | 1 |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  | 29,000,000 |  |  |  |  |  |  |  |
Shares remaining in reserve for issuance (in shares) |  |  | 9,900,000 |  |  |  |  |  |  |  |
SVS | CSUP |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Conversion rate, numerator (in shares) |  |  | 1 |  |  |  |  |  |  |  |
Conversion rate, denominator (in shares) |  |  | 1 |  |  |  |  |  |  |  |
SVS | 2020 NCIB |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  | 9,000,000 |  |  |  |  |  |
Accrual for repurchase of stock under automatic share purchase plan | $ |  |  |  |  | $ 7.5 |  |  |  |  |  | $ 15.0
SVS | ASPP |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  | 700,000 |  |  |  |  |  |
SVS | 2021 NCIB |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  | 8,800,000 |  |  |
SVS | 2021 SBC ASPP |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Accrual for repurchase of stock under automatic share purchase plan | $ |  |  |  |  | $ 33.8 |  |  |  |  |  |
SVS | 2021 SBC ASPP | Top of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, number of shares remaining |  |  |  |  | 3,000,000.0 |  |  |  |  |  |
SVS | 2023 SBC ASPP |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Accrual for repurchase of stock under automatic share purchase plan | $ |  |  | $ 7.5 |  |  |  |  |  |  |  |
SVS | 2023 SBC ASPP | Top of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, number of shares remaining |  |  | 300,000 |  |  |  |  |  |  |  |
SVS | 2023 NCIB |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  | 11,800,000 |  |  |  |  |
Stock repurchase program, number of shares remaining |  |  | 11,800,000 |  |  |  |  |  |  |  |
SVS | 2023 NCIB | Top of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  | 100,000 |  |  |  |  |  |  |  |
Multiple voting shares |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Subordinate voting shares, number of votes per share | vote |  |  | 25 |  |  |  |  |  |  |  |
Conversion of MVS into SVS in connection with the Secondary Offerings (in shares) |  |  | (18,600,000) |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  | 0 | 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 |  |  |  |  |  |  |  |
Director |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Employee SBC expense (note 12) | $ |  |  | $ 2.4 | $ 2.2 | $ 2.1 |  |  |  |  |  |
Director | DSUs | Carol Perry |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares owned (in shares) |  |  |  |  |  |  | 200,000 |  |  |  |
Director | DSUs | William A. Etherington |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares owned (in shares) |  |  |  |  |  |  | 500,000 |  |  |  |
Mr. Robert Mionis | Stock Options Exercised |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of share options exercised in share-based payment arrangement | 300,000 |  |  |  |  |  |  |  |  |  |

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