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CASH FLOW ITEMS - Reconciliation of Long-Term Debt Arising from Financing Activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 23, 2020
Long-term debt      
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward]      
Beginning balance $ 918.7 $ 464.4  
Proceeds 400.0 461.0  
Deferred transaction costs (23.0)    
Repayments (464.2) (7.4)  
Non-cash changes:      
Amortization of deferred financing charges 3.8 1.0  
Foreign currency translation 0.2 (1.3)  
Change in fair value of embedded derivative (4.1) 1.5  
Other (0.6) (0.5)  
Ending balance 830.8 918.7  
Equipment loans | Long-term debt      
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward]      
Beginning balance 16.1 18.7  
Proceeds 0.0 6.0  
Deferred transaction costs 0.0    
Repayments (9.2) (7.4)  
Non-cash changes:      
Amortization of deferred financing charges 0.1 0.1  
Foreign currency translation 0.2 (1.3)  
Change in fair value of embedded derivative 0.0 0.0  
Other 0.0 0.0  
Ending balance $ 7.2 $ 16.1  
5.75% senior notes | Fixed interest rate      
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]      
Interest rate 5.75% 5.75% 5.75%
5.75% senior notes | Long-term debt      
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward]      
Beginning balance $ 447.6 $ 445.7  
Proceeds 0.0 0.0  
Deferred transaction costs 0.0    
Repayments 0.0 0.0  
Non-cash changes:      
Amortization of deferred financing charges 0.9 0.9  
Foreign currency translation 0.0 0.0  
Change in fair value of embedded derivative 0.0 1.5  
Other (0.5) (0.5)  
Ending balance 448.0 447.6  
Credit Facility | Long-term debt      
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward]      
Beginning balance 455.0 0.0  
Proceeds 0.0 455.0  
Deferred transaction costs 0.0    
Repayments (455.0) 0.0  
Non-cash changes:      
Amortization of deferred financing charges 0.0 0.0  
Foreign currency translation 0.0 0.0  
Change in fair value of embedded derivative 0.0 0.0  
Other 0.0 0.0  
Ending balance $ 0.0 455.0  
Term Loan | Fixed interest rate      
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]      
Interest rate 8.25%    
Term Loan | Long-term debt      
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward]      
Beginning balance $ 0.0 0.0  
Proceeds 400.0 0.0  
Deferred transaction costs (23.0)    
Repayments 0.0 0.0  
Non-cash changes:      
Amortization of deferred financing charges 2.8 0.0  
Foreign currency translation 0.0 0.0  
Change in fair value of embedded derivative (4.1) 0.0  
Other (0.1) 0.0  
Ending balance $ 375.6 $ 0.0