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Debt (Non-revolving Credit Facility) (Details)
12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 27, 2020
USD ($)
Feb. 03, 2020
CAD ($)
Feb. 03, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]                
Repayment of credit facility $ 15,000,000 $ 11,000,000            
Outstanding borrowings $ 368,000,000   $ 289,000,000       $ 0  
Interest rate 0.87%   0.87%          
Available borrowing capacity     $ 310,000,000          
Non-Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Maximum borrowing capacity     $ 300,000,000 $ 310,000,000        
Term of Issuance 20 years 20 years            
Available borrowing capacity               $ 300,000,000
Equipment Loan, Non-Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Maximum borrowing capacity         $ 397,000,000 $ 300,000,000