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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

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