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Segmented Information - Schedule of Operating Segments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Total gross revenue $ 4,730.1 $ 4,827.3
Less inter-segment revenue 0.0 0.0
Gross revenue from external customers 4,730.1 4,827.3
Less subconsultant and other direct expenses 1,045.6 1,116.0
Net revenue 3,684.5 3,711.3
Gross margin 1,930.5 2,008.4
Operating Segments    
Disclosure of operating segments [line items]    
Total gross revenue 4,828.3 4,938.7
Less inter-segment revenue 98.2 111.4
Gross revenue from external customers 4,730.1 4,827.3
Less subconsultant and other direct expenses 1,045.6 1,116.0
Net revenue 3,684.5 3,711.3
Gross margin 1,930.5 2,008.4
Adjustments and Eliminations    
Disclosure of operating segments [line items]    
Total gross revenue (98.2) (111.4)
Less inter-segment revenue (98.2) (111.4)
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
Gross margin 0.0 0.0
Canada    
Disclosure of operating segments [line items]    
Gross revenue from external customers 1,238.5 1,283.1
Canada | Operating Segments    
Disclosure of operating segments [line items]    
Total gross revenue 1,272.6 1,314.7
Less inter-segment revenue 34.1 31.6
Gross revenue from external customers 1,238.5 1,283.1
Less subconsultant and other direct expenses 164.8 173.6
Net revenue 1,073.7 1,109.5
Gross margin 533.7 571.1
United States    
Disclosure of operating segments [line items]    
Gross revenue from external customers 2,655.2 2,688.1
United States | Operating Segments    
Disclosure of operating segments [line items]    
Total gross revenue 2,675.1 2,709.8
Less inter-segment revenue 19.9 21.7
Gross revenue from external customers 2,655.2 2,688.1
Less subconsultant and other direct expenses 695.4 740.5
Net revenue 1,959.8 1,947.6
Gross margin 1,048.7 1,070.2
Global | Operating Segments    
Disclosure of operating segments [line items]    
Total gross revenue 880.6 914.2
Less inter-segment revenue 44.2 58.1
Gross revenue from external customers 836.4 856.1
Less subconsultant and other direct expenses 185.4 201.9
Net revenue 651.0 654.2
Gross margin $ 348.1 $ 367.1