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Provisions - Summary of Provisions for Self-Insured Liabilities, Claims and Onerous Contracts (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Self-insured liabilities provision [member]    
Disclosure of other provisions [Line Items]    
Provision, beginning of the year CAD 69.4 CAD 61.5
Current-year provisions 23.9 10.5
Resulting from acquisitions   8.0
Costs paid or otherwise settled (17.5) (9.6)
Impact of foreign exchange (3.3) (1.0)
Provision, end of the year 72.5 69.4
Claims provision [member]    
Disclosure of other provisions [Line Items]    
Provision, beginning of the year 25.2 13.3
Current-year provisions 2.3 2.3
Resulting from acquisitions 0.2 23.6
Costs paid or otherwise settled (6.8) (11.3)
Impact of foreign exchange (2.0) (2.7)
Provision, end of the year 18.9 25.2
Onerous contracts provision [member]    
Disclosure of other provisions [Line Items]    
Provision, beginning of the year 10.8 10.7
Current-year provisions 0.7 4.3
Resulting from acquisitions   2.5
Costs paid or otherwise settled (6.4) (6.6)
Impact of foreign exchange (0.3) (0.1)
Provision, end of the year CAD 4.8 CAD 10.8