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Intangible Assets - Summary of Intangible Assets (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance CAD 449.5  
Ending Balance 262.4 CAD 449.5
Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 590.5 232.1
Additions 6.1 354.2
Removal of fully amortized assets (38.8) (27.8)
Impact of foreign exchange (26.4) 5.7
Ending Balance 430.5 590.5
Gross carrying amount [member] | Not internally generated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Additions 5.7 25.7
Gross carrying amount [member] | Internally generated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Additions   0.6
Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 141.0 94.0
Current year amortization 82.1 77.6
Removal of fully amortized assets (38.8) (27.8)
Impact of foreign exchange (5.2) (2.8)
Ending Balance 168.1 141.0
Client relationships [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 314.0  
Ending Balance 199.1 314.0
Client relationships [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 399.0 146.3
Additions 3.2 246.9
Removal of fully amortized assets (13.8) (0.3)
Impact of foreign exchange (20.8) 6.1
Ending Balance 289.5 399.0
Client relationships [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 85.0 59.3
Current year amortization 30.2 26.8
Removal of fully amortized assets (13.8) (0.3)
Impact of foreign exchange (3.8) (0.8)
Ending Balance 90.4 85.0
Contract backlog [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 36.3  
Ending Balance 10.3 36.3
Contract backlog [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 55.5 12.9
Additions 2.7 50.6
Removal of fully amortized assets (6.2) (9.5)
Impact of foreign exchange (4.1) 1.5
Ending Balance 47.9 55.5
Contract backlog [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 19.2 6.0
Current year amortization 26.4 22.3
Removal of fully amortized assets (6.2) (9.5)
Impact of foreign exchange (1.8) 0.4
Ending Balance 37.6 19.2
Software [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 69.4  
Ending Balance 38.7 69.4
Software [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 97.6 63.0
Additions   27.6
Removal of fully amortized assets (15.7) (16.5)
Impact of foreign exchange 0.4 (2.8)
Ending Balance 65.6 97.6
Software [member] | Gross carrying amount [member] | Not internally generated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Additions 5.7 25.7
Software [member] | Gross carrying amount [member] | Internally generated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Additions   0.6
Software [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 28.2 25.4
Current year amortization 17.2 21.6
Removal of fully amortized assets (15.7) (16.5)
Impact of foreign exchange 1.0 (2.3)
Ending Balance 26.9 28.2
Other intangibles [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 29.8  
Ending Balance 14.3 29.8
Other intangibles [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 38.4 9.9
Additions 0.2 29.1
Removal of fully amortized assets (3.1) (1.5)
Impact of foreign exchange (1.9) 0.9
Ending Balance 27.5 38.4
Other intangibles [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 8.6 3.3
Current year amortization 8.3 6.9
Removal of fully amortized assets (3.1) (1.5)
Impact of foreign exchange (0.6) (0.1)
Ending Balance 13.2 8.6
Lease disadvantages [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (4.8)  
Ending Balance (2.7) (4.8)
Lease disadvantages [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (10.3) (8.1)
Additions   (2.8)
Removal of fully amortized assets 2.5 0.5
Impact of foreign exchange 0.6 0.1
Ending Balance (7.2) (10.3)
Lease disadvantages [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (5.5) (4.1)
Current year amortization (1.9) (1.9)
Removal of fully amortized assets 2.5 0.4
Impact of foreign exchange 0.4 0.1
Ending Balance (4.5) CAD (5.5)
Innovyze, Inc. [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Disposals (103.3)  
Innovyze, Inc. [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Disposals (8.3)  
Innovyze, Inc. [member] | Client relationships [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Disposals (78.1)  
Innovyze, Inc. [member] | Client relationships [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Disposals (7.2)  
Innovyze, Inc. [member] | Software [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Disposals (19.1)  
Innovyze, Inc. [member] | Software [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Disposals (1.1)  
Innovyze, Inc. [member] | Other intangibles [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Disposals (6.1)  
Other [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Disposals (3.3)  
Other [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Disposals (2.7)  
Other [member] | Software [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Disposals (3.3)  
Other [member] | Software [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Disposals CAD (2.7)