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Segmented Information - Schedule of Operating Segments (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure of operating segments [line items] |  |
Gross revenue from external customers | $ 6,479.6 | $ 5,677.2
Less subconsultant and other direct expenses | 1,413.4 | 1,220.0
Net revenue | 5,066.2 | 4,457.2
Project margin | 2,744.7 | 2,417.3
Canada |  |
Disclosure of operating segments [line items] |  |
Gross revenue from external customers | 1,426.5 | 1,337.0
Canada | Operating Segments |  |
Disclosure of operating segments [line items] |  |
Gross revenue from external customers | 1,426.5 | 1,337.0
Less subconsultant and other direct expenses | 180.2 | 186.2
Net revenue | 1,246.3 | 1,150.8
Project margin | 667.4 | 611.0
United States |  |
Disclosure of operating segments [line items] |  |
Gross revenue from external customers | 3,634.5 | 3,056.6
United States | Operating Segments |  |
Disclosure of operating segments [line items] |  |
Gross revenue from external customers | 3,634.5 | 3,056.6
Less subconsultant and other direct expenses | 950.4 | 790.0
Net revenue | 2,684.1 | 2,266.6
Project margin | 1,475.1 | 1,254.1
Foreign countries [member] | Operating Segments |  |
Disclosure of operating segments [line items] |  |
Gross revenue from external customers | 1,418.6 | 1,283.6
Less subconsultant and other direct expenses | 282.8 | 243.8
Net revenue | 1,135.8 | 1,039.8
Project margin | $ 602.2 | $ 552.2

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