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Credit Facilities - Additional Information (Details)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Disclosure of detailed information about borrowings [line items]      
Outstanding letters of credit   $ 15,000,000.0 $ 15,200,000
Revolving Facilities      
Disclosure of detailed information about borrowings [line items]      
Maximum borrowing capacity $ 575,000,000    
Term Loan      
Disclosure of detailed information about borrowings [line items]      
Maximum borrowing capacity   $ 300,000,000  
Operating loan      
Disclosure of detailed information about borrowings [line items]      
Maximum borrowing capacity 50,000,000    
Syndicated loan      
Disclosure of detailed information about borrowings [line items]      
Maximum borrowing capacity 325,000,000    
Subsidiary syndicated loan      
Disclosure of detailed information about borrowings [line items]      
Maximum borrowing capacity $ 200,000,000