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Long-Term Notes (Details)
12 Months Ended
Mar. 05, 2020
CAD ($)
Feb. 05, 2020
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2020
USD ($)
Feb. 20, 2020
CAD ($)
Feb. 20, 2020
USD ($)
Feb. 05, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]                
Long-term notes - principal     $ 1,132,868,000 $ 1,328,175,000        
Notional amount     664,700,000          
Repayments of bonds, notes and debentures     833,672,000 198,128,000        
Early redemption expense     3,312,000 0        
Principal                
Disclosure of detailed information about borrowings [line items]                
Long-term notes - principal     1,147,950,000 1,337,200,000        
Loan repayments     830,400,000          
Changes in reported amount of U.S. denominated debt     23,600,000          
Unamortized debt issuance costs                
Disclosure of detailed information about borrowings [line items]                
Long-term notes - principal     $ (15,082,000) (9,025,000)        
5.125% notes due June 1, 2021                
Disclosure of detailed information about borrowings [line items]                
Notional amount         $ 400,000,000 $ 530,400,000 $ 400,000,000  
5.125% notes due June 1, 2021 | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate     5.125%   5.125% 5.125% 5.125%  
5.125% notes due June 1, 2021 | Principal                
Disclosure of detailed information about borrowings [line items]                
Long-term notes - principal     $ 0 518,600,000        
6.625% notes due July 19, 2022                
Disclosure of detailed information about borrowings [line items]                
Notional amount $ 300,000,000   $ 300,000,000          
Early redemption expense $ 3,300,000              
6.625% notes due July 19, 2022 | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate 6.625%   6.625%   6.625%      
Early redemption of notes 101.104%              
6.625% notes due July 19, 2022 | Principal                
Disclosure of detailed information about borrowings [line items]                
Long-term notes - principal     $ 0 300,000,000        
5.625% notes due June 1, 2024                
Disclosure of detailed information about borrowings [line items]                
Notional amount         $ 400,000,000      
5.625% notes due June 1, 2024 | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate     5.625%   5.625%      
5.625% notes due June 1, 2024 | Principal                
Disclosure of detailed information about borrowings [line items]                
Long-term notes - principal     $ 510,200,000 518,600,000        
8.75% Notes Due April 1, 2027                
Disclosure of detailed information about borrowings [line items]                
Notional amount         $ 500,000,000     $ 500,000,000
Transaction costs   $ 12,500,000            
8.75% Notes Due April 1, 2027 | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate     8.75%   8.75%     8.75%
8.75% Notes Due April 1, 2027 | Principal                
Disclosure of detailed information about borrowings [line items]                
Long-term notes - principal     $ 637,750,000 $ 0