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Share-Based Payment Plans - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	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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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

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- Definition

The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The number of share options granted in a share-based payment arrangement.

+ References

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-Name IFRS
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-IssueDate 2024-01-01
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- Definition

The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

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- Definition

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