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Recent Accounting Pronouncements and Changes to Accounting Policies - Consolidated Statements of Cash Flows (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Net income $ 361.5 $ 316.5 [1]
Deferred income taxes (42.4) (50.4) [1]
Trade and other payables and other accruals (59.6) (59.6) [1]
Net cash flows from operating activities 603.1 520.0 [1]
Repayment of notes payable and other financing obligations (101.1) (27.7) [1]
Net cash flows used in financing activities $ (152.1) (109.3) [1]
Previously stated    
Disclosure of detailed information about financial instruments [line items]    
Net income   331.2
Deferred income taxes   (45.6)
Trade and other payables and other accruals   (54.4)
Net cash flows from operating activities   544.7
Repayment of notes payable and other financing obligations   (52.4)
Net cash flows used in financing activities   (134.0)
Increase (Decrease)    
Disclosure of detailed information about financial instruments [line items]    
Net income   (14.7)
Deferred income taxes   (4.8)
Trade and other payables and other accruals   (5.2)
Net cash flows from operating activities   (24.7)
Repayment of notes payable and other financing obligations   24.7
Net cash flows used in financing activities   $ 24.7
[1] Revised for change in accounting policy (see Note 6.c)