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Segmented Information - Schedule of Gross Revenue by Services (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of products and services [line items]    
Gross revenue $ 4,730.1 $ 4,827.3
Buildings    
Disclosure of products and services [line items]    
Gross revenue 990.8 1,053.3
Energy & Resources    
Disclosure of products and services [line items]    
Gross revenue 631.9 613.1
Environmental Services    
Disclosure of products and services [line items]    
Gross revenue 757.6 779.8
Infrastructure    
Disclosure of products and services [line items]    
Gross revenue 1,345.9 1,407.9
Water    
Disclosure of products and services [line items]    
Gross revenue $ 1,003.9 $ 973.2