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Segmented Information - Schedule of Operating Segments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of operating segments [line items]    
Gross revenue from external customers $ 7,500.0 $ 6,479.6
Less subconsultant and other direct expenses 1,633.4 1,413.4
Net revenue 5,866.6 5,066.2
Direct payroll costs 2,670.9 2,321.5
Project margin 3,195.7 2,744.7
Canada    
Disclosure of operating segments [line items]    
Gross revenue from external customers 1,665.5 1,426.5
Canada | Operating Segments    
Disclosure of operating segments [line items]    
Gross revenue from external customers 1,665.5 1,426.5
Less subconsultant and other direct expenses 238.5 180.2
Net revenue 1,427.0 1,246.3
Direct payroll costs 670.3 578.9
Project margin 756.7 667.4
United States    
Disclosure of operating segments [line items]    
Gross revenue from external customers 4,113.6 3,634.5
United States | Operating Segments    
Disclosure of operating segments [line items]    
Gross revenue from external customers 4,113.6 3,634.5
Less subconsultant and other direct expenses 1,072.9 950.4
Net revenue 3,040.7 2,684.1
Direct payroll costs 1,354.6 1,209.0
Project margin 1,686.1 1,475.1
Global | Operating Segments    
Disclosure of operating segments [line items]    
Gross revenue from external customers 1,720.9 1,418.6
Less subconsultant and other direct expenses 322.0 282.8
Net revenue 1,398.9 1,135.8
Direct payroll costs 646.0 533.6
Project margin $ 752.9 $ 602.2