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Segmented Information - Schedule of Operating Segments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]    
Total gross revenue $ 5,677.2 $ 4,576.8
Less inter-segment revenue 0.0 0.0
Gross revenue from external customers 5,677.2 4,576.8
Less subconsultant and other direct expenses 1,220.0 940.7
Net revenue 4,457.2 3,636.1
Project margin 2,417.3 1,963.3
Operating Segments    
Disclosure of operating segments [line items]    
Total gross revenue 5,819.3 4,687.9
Less inter-segment revenue 142.1 111.1
Gross revenue from external customers 5,677.2 4,576.8
Less subconsultant and other direct expenses 1,220.0 940.7
Net revenue 4,457.2 3,636.1
Project margin 2,417.3 1,963.3
Adjustments and Eliminations    
Disclosure of operating segments [line items]    
Total gross revenue (142.1) (111.1)
Less inter-segment revenue (142.1) (111.1)
Gross revenue from external customers 0.0 0.0
Less subconsultant and other direct expenses 0.0 0.0
Net revenue 0.0 0.0
Project margin 0.0 0.0
Canada    
Disclosure of operating segments [line items]    
Gross revenue from external customers 1,337.0 1,225.9
Canada | Operating Segments    
Disclosure of operating segments [line items]    
Total gross revenue 1,375.5 1,257.7
Less inter-segment revenue 38.5 31.8
Gross revenue from external customers 1,337.0 1,225.9
Less subconsultant and other direct expenses 186.2 157.4
Net revenue 1,150.8 1,068.5
Project margin 611.0 571.9
United States    
Disclosure of operating segments [line items]    
Gross revenue from external customers 3,056.6 2,400.2
United States | Operating Segments    
Disclosure of operating segments [line items]    
Total gross revenue 3,099.5 2,431.5
Less inter-segment revenue 42.9 31.3
Gross revenue from external customers 3,056.6 2,400.2
Less subconsultant and other direct expenses 790.0 600.7
Net revenue 2,266.6 1,799.5
Project margin 1,254.1 977.8
Global | Operating Segments    
Disclosure of operating segments [line items]    
Total gross revenue 1,344.3 998.7
Less inter-segment revenue 60.7 48.0
Gross revenue from external customers 1,283.6 950.7
Less subconsultant and other direct expenses 243.8 182.6
Net revenue 1,039.8 768.1
Project margin $ 552.2 $ 413.6