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Segmented Information - Schedule of Operating Segments (Details) - CAD ($) $ in Millions | 12 Months Ended
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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

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