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Net Interest Expense and Other Net Finance Expense - Schedule of Interest Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Analysis of income and expense [abstract]    
Interest on borrowings $ 20.1 $ 37.6
Interest on lease liabilities 28.8 32.3
Other 4.2 3.4
Total interest expense 53.1 73.3
Interest income on FVOCI investment debt securities (2.8) (2.5)
Other (1.1) (1.2)
Total interest income (3.9) (3.7)
Net interest expense $ 49.2 $ 69.6