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LONG-TERM DEBT AND CREDIT FACILITY - Schedule of Contractual Maturities (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 23, 2020
Jun. 27, 2019
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Carrying amount of long-term debt     $ 450.0 $ 450.0
Borrowing costs capitalised     31.4 24.5
5.75% senior notes        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Carrying amount of long-term debt $ 454.2   450.0 450.0
Contractual cash flows     631.1 658.7
Borrowing costs capitalised $ 7.5      
5.75% senior notes | Unamortized deferred transactions costs        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Borrowing costs capitalised     6.3 7.2
5.75% senior notes | Not later than one year        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Contractual cash flows     25.9 27.5
5.75% senior notes | Later than one year and not later than three years        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Contractual 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 non-derivative financial liabilities [line items]        
Contractual cash flows     51.8 51.8
5.75% senior notes | Later than five years        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Contractual cash flows     501.6 527.6
Equipment loans        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Carrying amount of long-term debt     18.9 28.2
Contractual cash flows     20.5 31.3
Borrowing costs capitalised   $ 0.3    
Equipment loans | Unamortized deferred transactions costs        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Borrowing costs capitalised     0.2 0.2
Equipment loans | Not later than one year        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Contractual cash flows     8.5 9.4
Equipment loans | Later than one year and not later than three years        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Contractual cash flows     12.0 17.9
Equipment loans | Later than three years and not later than five years        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Contractual cash flows     0.0 4.0
Equipment loans | Later than five years        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Contractual cash flows     $ 0.0 $ 0.0