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Provisions - Summary of Provisions (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2019
CAD ($)
Disclosure of other provisions [Line Items]  
Provision, beginning of the year $ 128.3
Current year provisions 40.4
Acquisitions 1.0
Paid or otherwise settled (52.9)
Impact of foreign exchange (3.8)
Provisions, end of the year 113.0
Less current portion 23.9
Long-term portion 89.1
Previously stated [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year 120.6
Impact of IFRS 16 [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year 7.7
Self-insured liabilities provision [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year 77.0
Current year provisions 29.8
Paid or otherwise settled (24.1)
Impact of foreign exchange (2.6)
Provisions, end of the year 80.1
Less current portion 3.8
Long-term portion 76.3
Self-insured liabilities provision [member] | Previously stated [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year 77.0
Claims provision [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year 14.8
Current year provisions 8.4
Acquisitions 0.3
Paid or otherwise settled (7.9)
Impact of foreign exchange (0.2)
Provisions, end of the year 15.4
Less current portion 12.8
Long-term portion 2.6
Claims provision [member] | Previously stated [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year 14.8
Onerous contracts provision [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year 9.9
Current year provisions 0.4
Paid or otherwise settled (9.9)
Provisions, end of the year 0.4
Less current portion 0.1
Long-term portion 0.3
Onerous contracts provision [member] | Previously stated [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year 12.5
Onerous contracts provision [member] | Impact of IFRS 16 [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year (2.6)
Expected project loss [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year 15.6
Current year provisions (0.6)
Paid or otherwise settled (9.5)
Impact of foreign exchange (0.7)
Provisions, end of the year 4.8
Less current portion 4.8
Expected project loss [member] | Previously stated [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year 15.6
Provision for lease restoration [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year 11.0
Current year provisions 2.4
Acquisitions 0.7
Paid or otherwise settled (1.5)
Impact of foreign exchange (0.3)
Provisions, end of the year 12.3
Less current portion 2.4
Long-term portion 9.9
Provision for lease restoration [member] | Previously stated [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year 0.7
Provision for lease restoration [member] | Impact of IFRS 16 [member]  
Disclosure of other provisions [Line Items]  
Provision, beginning of the year $ 10.3