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Debt - Additional information (Details)
€ in Thousands, $ in Thousands
 12 Months Ended
Dec. 15, 2022
EUR (€)
Oct. 15, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
CAD ($)
Aug. 31, 2021
USD ($)
Aug. 26, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 05, 2019
Disclosure of financial liabilities [line items]                        
Percentage of borrowing funding Skouries project (as a percent) 80.00%                      
Remaining funding of Skouries project (as a percent) 20.00%                      
Borrowings, contingent overrun facility (as a percent) 10.00%                      
Proceeds from borrowings, classified as financing activities     $ 0 $ 500,000,000                
Debt redemption premium paid     0 517,286,000                
Debt redemption premium paid     0 21,400,000                
Borrowings     494,414,000 489,763,000                
Interest paid     34,862,000 23,643,000                
Fair value                        
Disclosure of financial liabilities [line items]                        
Redemption option derivative asset     $ 3,676,000 8,105,000                
Term Facility                        
Disclosure of financial liabilities [line items]                        
Borrowings, maximum capacity | € € 680,400                      
Borrowings, availability term 3 years                      
Borrowings, repayment term 7 years                      
Borrowings, weighted average maturity term     8 years                  
Greek Recovery and Resilience Facility                        
Disclosure of financial liabilities [line items]                        
Borrowings, maximum capacity | € € 200,000                      
Debt fixed interest rate (as a percent) 3.04%                      
Commercial Loan                        
Disclosure of financial liabilities [line items]                        
Borrowings, maximum capacity | € € 480,400                      
Variable rate hedged through interest rate swap (as a percent) 70.00%                      
Commercial Loan | Bottom of range                        
Disclosure of financial liabilities [line items]                        
Borrowings, interest rate basis spread on EURIBOR rate 5.90%                      
Commercial Loan | Top of range                        
Disclosure of financial liabilities [line items]                        
Borrowings, interest rate basis spread on EURIBOR rate 6.10%                      
Initial Funding from the RRF                        
Disclosure of financial liabilities [line items]                        
Borrowings, maximum capacity | € € 100,000                      
Bridge Facility                        
Disclosure of financial liabilities [line items]                        
Borrowings, maximum capacity | € 100,000                      
Revolving Credit Facility to Fund Reimbursable VAT Expenditures                        
Disclosure of financial liabilities [line items]                        
Borrowings, maximum capacity | € € 30,000                      
Senior Notes due 2029                        
Disclosure of financial liabilities [line items]                        
Debt fixed interest rate (as a percent)                 6.25% 6.25%    
Notional amount                 $ 500,000,000 $ 500,000,000    
Senior Notes due 2029 | Fair value                        
Disclosure of financial liabilities [line items]                        
Notional amount     $ 437,400,000                  
Redemption option derivative asset                   $ 4,806,000    
Loss on redemption option derivative     $ 4,429,000                  
Senior Notes due 2029 | After September 1, 2026                        
Disclosure of financial liabilities [line items]                        
Redemption percentage of aggregate principal amount of borrowings (as a percent)                   100.00%    
Senior Notes due 2029 | Prior to September 1, 2024                        
Disclosure of financial liabilities [line items]                        
Percentage of aggregate principal amount of borrowings (as a percent)                   100.00%    
Premium percentage of principal amount of borrowings (as a percent)                   1.00%    
Borrowings, additional basis points                   0.50%    
Percentage of original principal amount of borrowings (as a percent)                   40.00%    
Redemption percentage of aggregate principal amount of borrowings (as a percent)                   106.25%    
Senior Notes due 2029 | September 1, 2024                        
Disclosure of financial liabilities [line items]                        
Redemption percentage of aggregate principal amount of borrowings (as a percent)                   103.125%    
Senior Notes due 2029 | September 1, 2025                        
Disclosure of financial liabilities [line items]                        
Redemption percentage of aggregate principal amount of borrowings (as a percent)                   101.563%    
Senior Secured Notes due 2024                        
Disclosure of financial liabilities [line items]                        
Debt fixed interest rate (as a percent)                       9.50%
Debt redemption premium paid       233,953,000                
Secured Overnight Financing Rate | Bottom of range                        
Disclosure of financial liabilities [line items]                        
Borrowings, interest rate basis spread on SOFR rate (as a percent)   0.10%                    
Secured Overnight Financing Rate | Top of range                        
Disclosure of financial liabilities [line items]                        
Borrowings, interest rate basis spread on SOFR rate (as a percent)   0.15%                    
Senior Secured Credit Facility                        
Disclosure of financial liabilities [line items]                        
Notional amount   $ 250,000,000                    
Additional borrowing capacity   100,000,000                    
Borrowings, interest rate basis spread on SOFR rate (as a percent)     2.25%   2.25% 2.25%            
Loan undrawn standby fee (as a percent)     0.50625%                  
Senior Secured Credit Facility | Third Amended and Restated Credit Agreement                        
Disclosure of financial liabilities [line items]                        
Notional amount   $ 450,000,000                    
Senior Secured Credit Facility | Bottom of range                        
Disclosure of financial liabilities [line items]                        
Borrowings, interest rate basis spread on SOFR rate (as a percent)   2.125%                    
Loan undrawn standby fee (as a percent)   0.47813%                    
Senior Secured Credit Facility | Top of range                        
Disclosure of financial liabilities [line items]                        
Borrowings, interest rate basis spread on SOFR rate (as a percent)   3.25%                    
Loan undrawn standby fee (as a percent)   0.73125%                    
Term loan                        
Disclosure of financial liabilities [line items]                        
Debt redemption premium paid       133,333,000                
Revolving credit facility                        
Disclosure of financial liabilities [line items]                        
Debt redemption premium paid       150,000,000                
Borrowings       0             $ 150,000,000  
Non-Financial Letters of Credit                        
Disclosure of financial liabilities [line items]                        
Borrowings, interest rate basis spread on SOFR rate (as a percent)     1.50%   1.50% 1.50%            
Borrowings     $ 62,664,000 $ 66,417,000 € 58,216 $ 426 € 58,216 $ 426        
Non-Financial Letters of Credit | Bottom of range                        
Disclosure of financial liabilities [line items]                        
Debt fixed interest rate (as a percent)   0.90%                    
Non-Financial Letters of Credit | Top of range                        
Disclosure of financial liabilities [line items]                        
Debt fixed interest rate (as a percent)   1.33%                    
Financial Letters of Credit                        
Disclosure of financial liabilities [line items]                        
Borrowings, interest rate basis spread on SOFR rate (as a percent)     2.25%   2.25% 2.25%