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Provisions - Summary of Provisions (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
Reconciliation of changes in other provisions [abstract]  
Balance, beginning of the year $ 128.2
Increase in existing provisions, other provisions 46.5
Acquisitions 9.7
Paid or otherwise settled (24.5)
Impact of foreign exchange (0.6)
Balance, end of the year 159.3
Less current portion 36.7
Long-term portion 122.6
Self-insured liabilities  
Reconciliation of changes in other provisions [abstract]  
Balance, beginning of the year 95.8
Increase in existing provisions, other provisions 28.2
Acquisitions 0.0
Paid or otherwise settled (14.1)
Impact of foreign exchange (0.4)
Balance, end of the year 109.5
Less current portion 8.5
Long-term portion 101.0
Claims  
Reconciliation of changes in other provisions [abstract]  
Balance, beginning of the year 13.8
Increase in existing provisions, other provisions 2.2
Acquisitions 9.2
Paid or otherwise settled (4.8)
Impact of foreign exchange 0.0
Balance, end of the year 20.4
Less current portion 17.7
Long-term portion 2.7
Lease restoration  
Reconciliation of changes in other provisions [abstract]  
Balance, beginning of the year 12.2
Increase in existing provisions, other provisions 1.7
Acquisitions 0.5
Paid or otherwise settled (1.5)
Impact of foreign exchange (0.2)
Balance, end of the year 12.7
Less current portion 2.5
Long-term portion 10.2
Onerous contracts  
Reconciliation of changes in other provisions [abstract]  
Balance, beginning of the year 6.4
Increase in existing provisions, other provisions 14.4
Acquisitions 0.0
Paid or otherwise settled (4.1)
Impact of foreign exchange 0.0
Balance, end of the year 16.7
Less current portion 8.0
Long-term portion $ 8.7