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LONG-TERM DEBT AND CREDIT FACILITY - Schedule of Contractual Maturities (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 23, 2020 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Borrowing costs capitalised |  | $ 68.3 | $ 37.8
5.75% senior notes |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Long-term debt |  | 450.0 | 450.0
Bank borrowings, undiscounted cash flows |  | 579.5 | 605.3
Borrowing costs capitalised | $ 7.5 |  |
5.75% senior notes | Unamortized deferred transactions costs |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Borrowing costs capitalised |  | 4.5 | 5.5
5.75% senior notes | 2024 |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Bank borrowings, undiscounted cash flows |  | 25.9 | 25.9
5.75% senior notes | Later than one year and not later than three years |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Bank borrowings, undiscounted cash flows |  | 51.8 | 51.8
5.75% senior notes | Later than three years and not later than five years |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Bank borrowings, undiscounted cash flows |  | 501.8 | 51.8
5.75% senior notes | Later than five years |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Bank borrowings, undiscounted cash flows |  | 0.0 | 475.8
Term Loan |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Long-term debt |  | 400.0 | 0.0
Bank borrowings, undiscounted cash flows |  | 604.2 |
Term Loan | Unamortized deferred transactions costs |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Borrowing costs capitalised |  | 8.2 |
Term Loan | 2024 |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Bank borrowings, undiscounted cash flows |  | 50.1 |
Term Loan | Later than one year and not later than three years |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Bank borrowings, undiscounted cash flows |  | 91.3 |
Term Loan | Later than three years and not later than five years |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Bank borrowings, undiscounted cash flows |  | 462.8 |
Term Loan | Later than five years |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Bank borrowings, undiscounted cash flows |  | 0.0 |
Equipment loans |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Long-term debt |  | 7.3 | 16.2
Bank borrowings, undiscounted cash flows |  | 7.6 | 17.3
Equipment loans | Unamortized deferred transactions costs |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Borrowing costs capitalised |  | 0.1 | 0.1
Equipment loans | 2024 |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Bank borrowings, undiscounted cash flows |  | 5.1 | 9.1
Equipment loans | Later than one year and not later than three years |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Bank borrowings, undiscounted cash flows |  | 2.5 | 6.8
Equipment loans | Later than three years and not later than five years |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Bank borrowings, undiscounted cash flows |  | 0.0 | 1.4
Equipment loans | Later than five years |  |  |
Disclosure of maturity analysis for financial liabilities [line items] |  |  |
Bank borrowings, undiscounted cash flows |  | $ 0.0 | $ 0.0

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