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Segmented Information - Schedule of Operating Segments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]    
Total gross revenue $ 4,576.8 $ 4,730.1
Less inter-segment revenue 0.0 0.0
Gross revenue from external customers 4,576.8 4,730.1
Less subconsultant and other direct expenses 940.7 1,045.6
Net revenue 3,636.1 3,684.5
Project margin 1,963.3 1,930.5
Operating Segments    
Disclosure of operating segments [line items]    
Total gross revenue 4,687.9 4,828.3
Less inter-segment revenue 111.1 98.2
Gross revenue from external customers 4,576.8 4,730.1
Less subconsultant and other direct expenses 940.7 1,045.6
Net revenue 3,636.1 3,684.5
Project margin 1,963.3 1,930.5
Adjustments and Eliminations    
Disclosure of operating segments [line items]    
Total gross revenue (111.1) (98.2)
Less inter-segment revenue (111.1) (98.2)
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 1,225.9 1,238.5
Canada | Operating Segments    
Disclosure of operating segments [line items]    
Total gross revenue 1,257.7 1,272.6
Less inter-segment revenue 31.8 34.1
Gross revenue from external customers 1,225.9 1,238.5
Less subconsultant and other direct expenses 157.4 164.8
Net revenue 1,068.5 1,073.7
Project margin 571.9 533.7
United States    
Disclosure of operating segments [line items]    
Gross revenue from external customers 2,400.2 2,655.2
United States | Operating Segments    
Disclosure of operating segments [line items]    
Total gross revenue 2,431.5 2,675.1
Less inter-segment revenue 31.3 19.9
Gross revenue from external customers 2,400.2 2,655.2
Less subconsultant and other direct expenses 600.7 695.4
Net revenue 1,799.5 1,959.8
Project margin 977.8 1,048.7
Global | Operating Segments    
Disclosure of operating segments [line items]    
Total gross revenue 998.7 880.6
Less inter-segment revenue 48.0 44.2
Gross revenue from external customers 950.7 836.4
Less subconsultant and other direct expenses 182.6 185.4
Net revenue 768.1 651.0
Project margin $ 413.6 $ 348.1