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Share-Based Payment Plans - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 CAD ($) shares $ / shares | Dec. 31, 2023 CAD ($) $ / shares | Dec. 31, 2022 CAD ($) $ / shares
Executive officers |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of share options granted (in shares) | 0.7 | 0.4 | 0.3
Weighted average exercise price (in CAD per share) | $ / shares | $ 10.88 | $ 12.02 | $ 12.66
PSUs and RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Performance period | 3 years |  |
Vesting period | 3 years |  |
Compensation expense (reversal) | $ 23.0 | $ 21.0 | $ 20.0
PSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Performance period | 3 years |  |
DSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Compensation expense (reversal) | $ 8.0 | 1.0 | 0.0
Stock Options | Executive officers |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 3 years |  |
Compensation expense (reversal) | $ 1.0 | $ 1.0 | $ 1.0
Expiration period of shares granted | 7 years |  |

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