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Subsequent Events (Details)
12 Months Ended
Dec. 31, 2019
CAD ($)
Jan. 28, 2020
shares
Jan. 24, 2020
USD ($)
Subsequent events      
Subsequent event, description On January 28, 2020, the Board of Directors of the Company approved a new NCIB, which allows for the repurchase of up to 16 million common shares between February 1, 2020 and January 31, 2021. On January 24, 2020, the Company requested a borrowing of US$300 million under its non-revolving credit facility. The funds are expected to be received on February 3, 2020.    
Subsequent Event [Member]      
Subsequent events      
Common shares approved for repurchase (in shares) | shares   16,000,000  
Non-Revolving Credit Facility [Member]      
Subsequent events      
Outstanding borrowings $ 0    
Non-Revolving Credit Facility [Member] | Subsequent Event [Member]      
Subsequent events      
Outstanding borrowings     $ 300,000,000