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Financial Instruments - Contractual Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of financial liabilities [abstract]      
Total accounts payable and accrued liabilities $ 498.0 $ 308.0  
Income tax payables 32.1 25.8  
Provisions 474.0 303.2  
Current liabilities 624.2 380.8  
Current provisions 41.6 17.9  
Long-term provisions 432.4 285.3  
Closure and decommissioning      
Disclosure of financial liabilities [abstract]      
Provisions 447.1 296.2 $ 242.9
Current provisions 37.6 14.4  
Long-term provisions 409.5 281.8  
Liquidity risk      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 491.0 291.4  
Severance liabilities 60.5 20.0  
Payroll liabilities 4.9 2.8  
Total accounts payable and accrued liabilities 556.4 314.2  
Income tax payables 32.1 25.8  
Other liabilities   1.8  
Debt: Repayment of principal 703.7 193.7  
Debt: Interest & Standby Fees 164.6 29.0  
Provisions 26.9 6.9  
Future payroll liabilities 21.3 11.2  
Current liabilities 1,505.0 582.6  
Liquidity risk | Within 1 year      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 491.0 291.4  
Severance liabilities 2.1 13.9  
Payroll liabilities 4.9 2.8  
Total accounts payable and accrued liabilities 498.0 308.1  
Income tax payables 32.1 25.8  
Other liabilities   1.8  
Debt: Repayment of principal 6.7 13.7  
Debt: Interest & Standby Fees 29.1 11.2  
Provisions 4.0 3.4  
Future payroll liabilities 2.5 2.5  
Current liabilities 572.4 366.5  
Liquidity risk | 2 - 3 years      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 0.0 0.0  
Severance liabilities 17.2 1.0  
Payroll liabilities 0.0 0.0  
Total accounts payable and accrued liabilities 17.2 1.0  
Income tax payables 0.0 0.0  
Other liabilities   0.0  
Debt: Repayment of principal 11.9 173.4  
Debt: Interest & Standby Fees 57.6 17.7  
Provisions 14.0 2.4  
Future payroll liabilities 17.0 8.7  
Current liabilities 117.7 203.2  
Liquidity risk | 4- 5 years      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 0.0 0.0  
Severance liabilities 9.0 0.6  
Payroll liabilities 0.0 0.0  
Total accounts payable and accrued liabilities 9.0 0.6  
Income tax payables 0.0 0.0  
Other liabilities   0.0  
Debt: Repayment of principal 275.3 6.6  
Debt: Interest & Standby Fees 43.4 0.1  
Provisions 1.2 0.0  
Future payroll liabilities 0.0 0.0  
Current liabilities 328.9 7.3  
Liquidity risk | After 5 years      
Disclosure of financial liabilities [abstract]      
Accounts payable and accrued liabilities other than: 0.0 0.0  
Severance liabilities 32.2 4.5  
Payroll liabilities 0.0 0.0  
Total accounts payable and accrued liabilities 32.2 4.5  
Income tax payables 0.0 0.0  
Other liabilities   0.0  
Debt: Repayment of principal 409.8 0.0  
Debt: Interest & Standby Fees 34.5 0.0  
Provisions 7.7 1.1  
Future payroll liabilities 1.8 0.0  
Current liabilities $ 486.0 $ 5.6