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Property and Equipment - Schedule of Property and Equipment (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment CAD 213.9  
Property plant and equipment 212.6 CAD 213.9
Engineering equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 58.8  
Property plant and equipment 59.3 58.8
Office equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 36.4  
Property plant and equipment 34.0 36.4
Leasehold improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 102.0  
Property plant and equipment 101.4 102.0
Assets under finance leases [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 0.8  
Property plant and equipment 0.1 0.8
Other [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 15.9  
Property plant and equipment 17.8 15.9
Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 414.8 364.5
Additions 62.1 58.7
Additions arising on acquisitions 0.8 54.4
Disposals (78.5) (56.5)
Transfers   (0.1)
Impact of foreign exchange (11.5) (6.2)
Property plant and equipment 387.7 414.8
Gross carrying amount [member] | Engineering equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 131.9 129.0
Additions 21.2 15.8
Additions arising on acquisitions 0.2 15.7
Disposals (33.4) (27.1)
Transfers 0.1 1.4
Impact of foreign exchange (3.3) (2.9)
Property plant and equipment 116.7 131.9
Gross carrying amount [member] | Office equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 82.0 70.7
Additions 6.8 12.0
Additions arising on acquisitions 0.1 6.2
Disposals (24.9) (5.9)
Transfers (0.8) 0.5
Impact of foreign exchange (1.6) (1.5)
Property plant and equipment 61.6 82.0
Gross carrying amount [member] | Leasehold improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 166.9 130.9
Additions 29.4 27.7
Additions arising on acquisitions 0.5 28.5
Disposals (16.4) (18.7)
Transfers 0.2 (0.5)
Impact of foreign exchange (5.1) (1.0)
Property plant and equipment 175.5 166.9
Gross carrying amount [member] | Assets under finance leases [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 0.9 2.2
Additions arising on acquisitions   0.8
Disposals (0.8) (0.6)
Transfers   (1.4)
Impact of foreign exchange   (0.1)
Property plant and equipment 0.1 0.9
Gross carrying amount [member] | Other [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 33.1 31.7
Additions 4.7 3.2
Additions arising on acquisitions   3.2
Disposals (3.0) (4.2)
Transfers 0.5 (0.1)
Impact of foreign exchange (1.5) (0.7)
Property plant and equipment 33.8 33.1
Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 200.9 206.4
Current year depreciation 54.6 51.2
Disposals (76.7) (51.6)
Impact of foreign exchange (3.7) (5.1)
Property plant and equipment 175.1 200.9
Accumulated depreciation and amortization [member] | Engineering equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 73.1 82.3
Current year depreciation 18.2 17.6
Disposals (32.7) (25.5)
Transfers   0.7
Impact of foreign exchange (1.2) (2.0)
Property plant and equipment 57.4 73.1
Accumulated depreciation and amortization [member] | Office equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 45.6 45.1
Current year depreciation 7.6 8.4
Disposals (25.4) (5.2)
Impact of foreign exchange (0.2) (2.7)
Property plant and equipment 27.6 45.6
Accumulated depreciation and amortization [member] | Leasehold improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 64.9 61.2
Current year depreciation 26.7 22.2
Disposals (15.9) (17.5)
Transfers   (0.1)
Impact of foreign exchange (1.6) (0.9)
Property plant and equipment 74.1 64.9
Accumulated depreciation and amortization [member] | Assets under finance leases [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 0.1 0.9
Current year depreciation   0.2
Disposals (0.1) (0.3)
Transfers   (0.6)
Impact of foreign exchange   (0.1)
Property plant and equipment   0.1
Accumulated depreciation and amortization [member] | Other [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property plant and equipment 17.2 16.9
Current year depreciation 2.1 2.8
Disposals (2.6) (3.1)
Impact of foreign exchange (0.7) 0.6
Property plant and equipment CAD 16.0 CAD 17.2