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Business Acquisitions - Summary of Consideration for Assets Acquired and Liabilities Assumed (Detail) - Aggregated individually immaterial business combinations [member]
$ in Millions
Dec. 31, 2018
CAD ($)
Disclosure of detailed information about business combination [line items]  
Cash consideration $ 88.0
Notes payable 55.6
Consideration 143.6
Assets and liabilities acquired  
Cash acquired 7.8
Trade receivables 34.7
Unbilled receivables 6.4
Accounts payable (19.8)
Other non-cash working capital (0.6)
Property and equipment 4.4
Intangible assets 33.0
Deferred tax assets 1.9
Net employee defined benefit liability (16.5)
Provisions (1.4)
Deferred tax liabilities (2.6)
Total identifiable net assets at fair value 47.3
Goodwill arising on acquisitions 96.3
Consideration $ 143.6