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Assets Held For Sale (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about investment property [line items]    
Liabilities associated with assets held for sale $ (7.9) $ 0.0
PP&E | Non-current assets held for sale    
Disclosure of detailed information about investment property [line items]    
Non-current assets or disposal groups classified as held for sale 195.0  
Decommissioning liability | Non-current assets held for sale    
Disclosure of detailed information about investment property [line items]    
Liabilities associated with assets held for sale $ (7.9)