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Trade and Other Receivables - Aging Analysis of Gross Trade Receivables (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Trade and other receivables [line items]    
Gross trade receivables $ 789.9 $ 705.7
1-30    
Trade and other receivables [line items]    
Gross trade receivables 467.8 389.5
31-60    
Trade and other receivables [line items]    
Gross trade receivables 181.1 160.3
61-90    
Trade and other receivables [line items]    
Gross trade receivables 56.3 60.9
91-120    
Trade and other receivables [line items]    
Gross trade receivables 30.6 25.9
121+    
Trade and other receivables [line items]    
Gross trade receivables $ 54.1 $ 69.1