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Property and Equipment - Schedule of Property and Equipment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 286.5  
Depreciation 57.9 $ 58.2
Ending balance 240.1 286.5
Engineering equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 61.5  
Ending balance 56.9 61.5
Office equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 48.9  
Ending balance 42.1 48.9
Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 153.9  
Ending balance 119.9 153.9
Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 22.2  
Ending balance 21.2 22.2
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 500.6 473.3
Additions 33.3 59.1
Additions arising on acquisitions 2.2 5.8
Disposals (45.3) (25.0)
Impact of foreign exchange (3.9) (12.6)
Ending balance 486.9 500.6
Cost | Engineering equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 126.8 122.3
Additions 13.3 20.3
Additions arising on acquisitions 1.4 0.7
Disposals (22.6) (13.7)
Impact of foreign exchange (0.5) (2.8)
Ending balance 118.4 126.8
Cost | Office equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 86.8 82.0
Additions 5.0 9.6
Additions arising on acquisitions 0.4 0.7
Disposals (6.0) (3.1)
Impact of foreign exchange (0.9) (2.4)
Ending balance 85.3 86.8
Cost | Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 246.6 231.2
Additions 12.6 24.4
Additions arising on acquisitions 0.2 4.4
Disposals (15.0) (7.3)
Impact of foreign exchange (1.8) (6.1)
Ending balance 242.6 246.6
Cost | Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 40.4 37.8
Additions 2.4 4.8
Additions arising on acquisitions 0.2 0.0
Disposals (1.7) (0.9)
Impact of foreign exchange (0.7) (1.3)
Ending balance 40.6 40.4
Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (214.1) (183.9)
Depreciation 57.9 58.2
Disposals 42.3 22.9
Impairment 19.5  
Impact of foreign exchange (2.4) (5.1)
Ending balance (246.8) (214.1)
Accumulated depreciation | Engineering equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (65.3) (62.2)
Depreciation 17.2 16.5
Disposals 20.5 12.2
Impairment 0.0  
Impact of foreign exchange (0.5) (1.2)
Ending balance (61.5) (65.3)
Accumulated depreciation | Office equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (37.9) (33.2)
Depreciation 8.1 8.1
Disposals 5.5 2.6
Impairment 3.2  
Impact of foreign exchange (0.5) (0.8)
Ending balance (43.2) (37.9)
Accumulated depreciation | Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (92.7) (71.5)
Depreciation 29.7 30.9
Disposals 14.9 7.3
Impairment 16.3  
Impact of foreign exchange (1.1) (2.4)
Ending balance (122.7) (92.7)
Accumulated depreciation | Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (18.2) (17.0)
Depreciation 2.9 2.7
Disposals 1.4 0.8
Impairment 0.0  
Impact of foreign exchange (0.3) (0.7)
Ending balance $ (19.4) $ (18.2)