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Capital Stock - Schedule of Repurchase Activities under NCIB and SVS Held for Delivery under SBC Plans (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended |
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Aggregate cost of SVS repurchased for cancellation | $ 35.6 |  | $ 34.6 |  | $ 35.9 |  |
Aggregate cost of SVS repurchased for delivery under SBC plans | 89.8 | [1] | 11.1 | [2] | 54.4 | [3] |
SVS |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Aggregate cost of SVS repurchased for cancellation | $ 35.6 |  | $ 34.6 |  | $ 35.9 |  |
Number of SVS repurchased for cancellation (in millions) (in shares) | 2,600 |  | 3,400 |  | 4,400 |  |
Weighted average price per share for repurchases (in dollars per share) | $ 13.83 |  | $ 10.45 |  | $ 8.21 |  |
Aggregate cost of SVS repurchased for delivery under SBC plans | $ 82.3 |  | $ 44.9 |  | $ 20.6 |  |
Number of SVS repurchased for delivery under SBC plans (in millions) (in shares) | 3,700 |  | 3,900 |  | 1,900 |  |
Number of SVS held by trustee for delivery under SBC plans (in millions) (in shares) | 3,300 |  | 1,500 |  | 1,400 |  |
Value of SVS held by trustee for delivery under SBC plans | $ 72.6 |  | $ 16.7 |  | $ 15.1 |  |
Number of SVS repurchased for cancellation (in millions) (in shares) | 2,700 |  | 3,140 |  | 4,400 |  |
Accrual for repurchase of stock under automatic share purchase plan | $ 2.7 |  |  |  |  |  |
SVS | 2020 NCIB |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Accrual for repurchase of stock under automatic share purchase plan |  |  |  |  | $ 7.5 |  | $ 15.0
SVS | NICB ASPP |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Number of SVS repurchased for cancellation (in millions) (in shares) | 900 |  | 2,500 |  | 2,800 |  |
SVS | 2021 SBC ASPP |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Accrual for repurchase of stock under automatic share purchase plan |  |  |  |  | $ 33.8 |  |
SVS | SBC ASPP |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Number of SVS repurchased for delivery under SBC plans (in millions) (in shares) | 3,700 |  | 3,900 |  | 700 |  |
[1] | Consists of $82.3 paid to repurchase SVS for delivery obligations under our SBC plans in 2023 and $7.5 accrued at December 31, 2023 for the estimated Contractual Maximum Quantity under an ASPP executed in September 2023 for such purpose. See note 12.
[2] | Consists of $44.9 paid to repurchase SVS for delivery obligations under our SBC plans in 2022, offset in part by the reversal of the $33.8 2021 SBC Accrual. See note 12.
[3] | Consists of $20.6 paid to repurchase SVS for delivery obligations under our SBC plans in 2021, and $33.8 accrued as of December 31, 2021 for the estimated Contractual Maximum Quantity under an ASPP executed in December 2021 for such purpose (2021 SBC Accrual). See note 12.

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