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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