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Net Interest Expense - Schedule of Interest Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Analysis of income and expense [abstract]    
Interest on credit facilities $ 9.5 $ 20.1
Interest on lease liabilities 23.7 28.8
Other 9.5 4.2
Total interest expense 42.7 53.1
Interest income on FVOCI investment debt securities (3.5) (2.8)
Other (1.3) (1.1)
Total interest income (4.8) (3.9)
Net interest expense $ 37.9 $ 49.2