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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 |  |  |  |

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