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Provisions - Schedule of Provisions (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
Reconciliation of changes in other provisions [abstract]  
Balance, beginning of the year $ 197.8
Current year provisions 61.8
Paid or otherwise settled (70.4)
Impact of foreign exchange (2.7)
Balance, end of the year 186.5
Less current portion 51.7
Long-term portion 134.8
Self-insured liabilities  
Reconciliation of changes in other provisions [abstract]  
Balance, beginning of the year 94.6
Current year provisions 20.1
Paid or otherwise settled (26.7)
Impact of foreign exchange (1.4)
Balance, end of the year 86.6
Less current portion 7.8
Long-term portion 78.8
Claims  
Reconciliation of changes in other provisions [abstract]  
Balance, beginning of the year 52.6
Current year provisions 21.2
Paid or otherwise settled (26.1)
Impact of foreign exchange (1.0)
Balance, end of the year 46.7
Less current portion 25.5
Long-term portion 21.2
Lease restoration  
Reconciliation of changes in other provisions [abstract]  
Balance, beginning of the year 17.5
Current year provisions 15.6
Paid or otherwise settled (4.5)
Impact of foreign exchange (0.1)
Balance, end of the year 28.5
Less current portion 5.7
Long-term portion 22.8
Onerous contracts  
Reconciliation of changes in other provisions [abstract]  
Balance, beginning of the year 33.1
Current year provisions 4.9
Paid or otherwise settled (13.1)
Impact of foreign exchange (0.2)
Balance, end of the year 24.7
Less current portion 12.7
Long-term portion $ 12.0