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Long-Term Debt - Summary of Long Term Debt (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Long-term debt $ 680.8 $ 860.9
Less current portion 46.6 46.9
Long-term portion 634.2 814.0
Senior unsecured notes    
Disclosure of detailed information about borrowings [line items]    
Long-term debt 299.5 0.0
Revolving credit facility    
Disclosure of detailed information about borrowings [line items]    
Long-term debt 0.0 448.0
Term loan    
Disclosure of detailed information about borrowings [line items]    
Long-term debt 309.1 308.5
Notes payable    
Disclosure of detailed information about borrowings [line items]    
Long-term debt 68.8 88.7
Software financing obligations    
Disclosure of detailed information about borrowings [line items]    
Long-term debt $ 3.4 $ 15.7