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Financial Instruments - Contractual Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial liabilities [abstract]      
Total accounts payable and accrued liabilities $ 489.4 $ 498.0  
Income tax payables 102.1 32.1  
Provisions 462.4 474.0  
Current liabilities 687.0 624.2  
Current provisions 35.3 41.6  
Long-term provisions 427.1 432.4  
Closure and decommissioning      
Disclosure of financial liabilities [abstract]      
Provisions 438.3 447.1 $ 296.2
Liquidity risk      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 471.4 491.0  
Severance liabilities 60.4 60.5  
Payroll liabilities 10.4 4.9  
Total accounts payable and accrued liabilities 542.2 556.4  
Income tax payables 102.1 32.1  
Other liabilities 12.8    
Debt: Repayment of principal 708.8 703.7  
Debt: Interest & Standby Fees 135.6 164.6  
Provisions 24.1 26.9  
Future payroll liabilities 31.4 21.3  
Current liabilities 1,557.0 1,505.0  
Liquidity risk | Closure and decommissioning      
Disclosure of financial liabilities [abstract]      
Current provisions 27.7 37.6  
Long-term provisions 410.6 409.5  
Liquidity risk | Within 1 year      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 471.4 491.0  
Severance liabilities 7.6 2.1  
Payroll liabilities 10.4 4.9  
Total accounts payable and accrued liabilities 489.4 498.0  
Income tax payables 102.1 32.1  
Other liabilities 12.8    
Debt: Repayment of principal 6.8 6.7  
Debt: Interest & Standby Fees 28.9 29.1  
Provisions 5.4 4.0  
Future payroll liabilities 1.7 2.5  
Current liabilities 647.1 572.4  
Liquidity risk | 2 - 3 years      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 0.0 0.0  
Severance liabilities 12.5 17.2  
Payroll liabilities 0.0 0.0  
Total accounts payable and accrued liabilities 12.5 17.2  
Income tax payables 0.0 0.0  
Other liabilities 0.0    
Debt: Repayment of principal 282.5 11.9  
Debt: Interest & Standby Fees 56.8 57.6  
Provisions 9.0 14.0  
Future payroll liabilities 27.0 17.0  
Current liabilities 387.8 117.7  
Liquidity risk | 4- 5 years      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 0.0 0.0  
Severance liabilities 7.9 9.0  
Payroll liabilities 0.0 0.0  
Total accounts payable and accrued liabilities 7.9 9.0  
Income tax payables 0.0 0.0  
Other liabilities 0.0    
Debt: Repayment of principal 0.0 275.3  
Debt: Interest & Standby Fees 28.5 43.4  
Provisions 2.4 1.2  
Future payroll liabilities 0.0 0.0  
Current liabilities 38.8 328.9  
Liquidity risk | After 5 years      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 0.0 0.0  
Severance liabilities 32.4 32.2  
Payroll liabilities 0.0 0.0  
Total accounts payable and accrued liabilities 32.4 32.2  
Income tax payables 0.0 0.0  
Other liabilities 0.0    
Debt: Repayment of principal 419.5 409.8  
Debt: Interest & Standby Fees 21.4 34.5  
Provisions 7.3 7.7  
Future payroll liabilities 2.7 1.8  
Current liabilities $ 483.3 $ 486.0