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LONG-TERM DEBT AND CREDIT FACILITY (Tables) | 12 Months Ended
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Dec. 31, 2021
Financial Instruments [Abstract] |
Disclosure of detailed information about borrowings |
| Notes | December 31, 2021 | December 31, 2020
5.75% senior notes | (a) | $ | 445.7 |  | $ | 438.6 |
Equipment loans | (c) | 18.7 |  | 28.0 |
|  | $ | 464.4 |  | $ | 466.6 |
Current portion of long-term debt |  | $ | 7.5 |  | $ | 7.9 |
Non-current portion of long-term debt |  | 456.9 |  | 458.7 |
|  | $ | 464.4 |  | $ | 466.6 |
Contractual maturities of notes | The following are the contractual maturities related to the Notes, including interest payments:
| Payments due by period
Notes balance as at | Carrying amount 1 | Contractual cash flows |  | <1 yr | 1-2 yrs | 3-4 yrs | >4 yrs
December 31, 2021 | $ | 450.0 |  | $ | 631.1 |  |  | $ | 25.9 |  | $ | 51.8 |  | $ | 51.8 |  | $ | 501.6 |
December 31, 2020 | $ | 450.0 |  | $ | 658.7 |  |  | $ | 27.5 |  | $ | 51.8 |  | $ | 51.8 |  | $ | 527.6 |
1.The carrying amount of the long-term debt excludes unamortized deferred transaction costs of $6.3 million as at December 31, 2021 (December 31, 2020 – $7.2 million) and the embedded derivative. The following are the contractual maturities related to the equipment loans, including interest payments:
| Payments due by period
Equipment loans balance as at | Carrying amount 1 | Contractual cash flows |  | <1 yr | 1-2 yrs | 3-4 yrs | >4 yrs
December 31, 2021 | $ | 18.9 |  | $ | 20.5 |  |  | $ | 8.5 |  | $ | 12.0 |  | $ | — |  | $ | — |
December 31, 2020 | $ | 28.2 |  | $ | 31.3 |  |  | $ | 9.4 |  | $ | 17.9 |  | $ | 4.0 |  | $ | — |
1.The carrying amount of the long-term debt excludes unamortized deferred transaction costs of $0.2 million as at December 31, 2021 (December 31, 2020 – $0.2 million).

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- Definition Financial Instruments [Abstract] + References No definition available. + Details
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- Definition The disclosure of detailed information about borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_7&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The disclosure of a maturity analysis for non-derivative financial liabilities (including issued financial guarantee contracts) that shows the remaining contractual maturities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 39 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_39_a&doctype=Standard -URIDate 2021-03-24 + Details
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