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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, 2024
Dec. 31, 2023
Sep. 23, 2020
Long-term debt      
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward]      
Beginning balance $ 830.8 $ 918.7  
Draws 280.0 400.0  
Deferred transaction costs   (23.0)  
Repayments (65.1) (464.2)  
Non-cash changes:      
Amortization of deferred financing charges 5.3 3.8  
Foreign currency translation   0.2  
Change in fair value of embedded derivative (21.6) (4.1)  
Other (0.5) (0.6)  
Ending balance 1,028.9 830.8  
Equipment loans | Long-term debt      
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward]      
Beginning balance 7.2 16.1  
Draws 0.0 0.0  
Deferred transaction costs   0.0  
Repayments (5.1) (9.2)  
Non-cash changes:      
Amortization of deferred financing charges 0.0 0.1  
Foreign currency translation   0.2  
Change in fair value of embedded derivative 0.0 0.0  
Other 0.0 0.0  
Ending balance $ 2.1 7.2  
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% senior notes | Long-term debt      
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward]      
Beginning balance $ 448.0 447.6  
Draws 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  
Change in fair value of embedded derivative 0.0 0.0  
Other (0.5) (0.5)  
Ending balance 448.4 448.0  
Credit facility | Long-term debt      
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward]      
Beginning balance 0.0 455.0  
Draws 280.0 0.0  
Deferred transaction costs   0.0  
Repayments (60.0) (455.0)  
Non-cash changes:      
Amortization of deferred financing charges 0.0 0.0  
Foreign currency translation   0.0  
Change in fair value of embedded derivative 0.0 0.0  
Other 0.0 0.0  
Ending balance $ 220.0 0.0  
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 $ 375.6 0.0  
Draws 0.0 400.0  
Deferred transaction costs   (23.0)  
Repayments 0.0 0.0  
Non-cash changes:      
Amortization of deferred financing charges 4.4 2.8  
Foreign currency translation   0.0  
Change in fair value of embedded derivative (21.6) (4.1)  
Other 0.0 (0.1)  
Ending balance $ 358.4 $ 375.6