v3.25.1
Events after the reporting period (Details) - USD ($)
Feb. 20, 2025
Feb. 17, 2025
Feb. 04, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jul. 23, 2021
Disclosure of non-adjusting events after reporting period [line items]                
Dividends proposed or declared before financial statements $ 80,500,000              
Dividends proposed or declared before financial statements net of treasury shares $ 74,200,000              
Shareholders agreed to distribute dividends       $ 261,000 $ 567,000 $ 639,000 $ 567,000  
El Brocal                
Disclosure of non-adjusting events after reporting period [line items]                
Dividends proposed or declared before financial statements   $ 16,100,000            
Senior Notes at 5.50 Percent Due 2026                
Disclosure of non-adjusting events after reporting period [line items]                
Notional amount     $ 550,000,000 $ 546,184,000 $ 544,062,000     $ 550,000,000
Borrowings rate of interest       5.50%       5.50%
Issue price (in percent)               99.14%
Issuance of Borrowings | Unsecured Senior Bonds At 6.800 Percent Due 2032                
Disclosure of non-adjusting events after reporting period [line items]                
Notional amount     $ 650,000,000          
Borrowings rate of interest     6.80%          
Issue price (in percent)     98.367%          
Tender Offer of Borrowings | Senior Notes at 5.50 Percent Due 2026                
Disclosure of non-adjusting events after reporting period [line items]                
Borrowings amount repurchased     $ 401,392,000          
Percentage on Notional Amount     72.98%