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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, 2021
Dec. 31, 2020
Sep. 23, 2020
Sep. 08, 2020
May 12, 2020
Jun. 27, 2019
Long-term debt            
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward]            
Beginning balance $ 466.6 $ 408.5        
Gross proceeds   460.9        
Deferred transaction costs   (7.5)        
Repayments (7.7) (427.5)        
Non-cash changes:            
Amortization of deferred financing charges 0.9 0.9        
Foreign currency translation (1.6) 2.8        
Change in fair value of embedded derivative 6.9 7.8        
Loss on redemption   22.5        
Other (0.7) (1.8)        
Ending balance 464.4 466.6        
Equipment loans            
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]            
Interest rate         5.95% 5.23%
Equipment loans | Long-term debt            
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward]            
Beginning balance 28.0 20.4        
Gross proceeds   10.9        
Deferred transaction costs   0.0        
Repayments (7.7) (6.2)        
Non-cash changes:            
Amortization of deferred financing charges 0.0 0.1        
Foreign currency translation (1.6) 2.8        
Change in fair value of embedded derivative 0.0 0.0        
Loss on redemption   0.0        
Other 0.0 0.0        
Ending balance $ 18.7 $ 28.0        
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 $ 438.6 $ 0.0        
Gross proceeds   450.0        
Deferred transaction costs   (7.5)        
Repayments 0.0 0.0        
Non-cash changes:            
Amortization of deferred financing charges 0.9 0.3        
Foreign currency translation 0.0 0.0        
Change in fair value of embedded derivative 6.9 (4.2)        
Loss on redemption   0.0        
Other (0.7) 0.0        
Ending balance 445.7 $ 438.6        
7.0% Senior Notes | Fixed interest rate            
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]            
Interest rate   7.00%   7.00%    
7.0% Senior Notes | Long-term debt            
Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward]            
Beginning balance 0.0 $ 388.1        
Gross proceeds   0.0        
Deferred transaction costs   0.0        
Repayments 0.0 (421.3)        
Non-cash changes:            
Amortization of deferred financing charges 0.0 0.5        
Foreign currency translation 0.0 0.0        
Change in fair value of embedded derivative 0.0 12.0        
Loss on redemption   22.5        
Other 0.0 (1.8)        
Ending balance $ 0.0 $ 0.0