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Provisions - Summary of Provisions (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Disclosure of other provisions [Line Items]    
Provision, beginning of the year $ 96.2 $ 105.4
Current year provisions 58.0 26.9
Acquisitions 1.4 0.2
Paid or otherwise settled (40.5) (30.7)
Impact of foreign exchange 5.5 (5.6)
Provisions, end of the year 120.6 96.2
Less current portion 42.4 28.1
Long-term portion 78.2 68.1
Self-insured liabilities provision [member]    
Disclosure of other provisions [Line Items]    
Provision, beginning of the year 72.5 69.4
Current year provisions 25.1 23.9
Paid or otherwise settled (24.9) (17.5)
Impact of foreign exchange 4.3 (3.3)
Provisions, end of the year 77.0 72.5
Less current portion 3.8 6.6
Long-term portion 73.2 65.9
Claims provision [member]    
Disclosure of other provisions [Line Items]    
Provision, beginning of the year 18.9 25.2
Current year provisions 4.0 2.3
Acquisitions 0.8 0.2
Paid or otherwise settled (9.8) (6.8)
Impact of foreign exchange 0.9 (2.0)
Provisions, end of the year 14.8 18.9
Less current portion 11.3 18.8
Long-term portion 3.5 0.1
Onerous contracts provision [member]    
Disclosure of other provisions [Line Items]    
Provision, beginning of the year 4.8 10.8
Current year provisions 13.3 0.7
Acquisitions 0.6  
Paid or otherwise settled (5.8) (6.4)
Impact of foreign exchange 0.3 (0.3)
Provisions, end of the year 13.2 4.8
Less current portion 11.7 2.7
Long-term portion 1.5 $ 2.1
Expected project loss [member]    
Disclosure of other provisions [Line Items]    
Current year provisions 15.6  
Provisions, end of the year 15.6  
Less current portion $ 15.6