v3.26.1
Provisions - Changes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in other provisions [abstract]    
Balance at beginning of period $ 107,516,000 $ 142,727,000
Charges for the year 84,472,000 77,829,000
Provisions reversed with a credit to income (5,039,000) (8,584,000)
Amounts used (80,510,000) (96,402,000)
Remeasurement through other comprehensive income (loss) (1,346,000) (1,942,000)
Exchange differences and others 12,702,000 (6,112,000)
Balance at end of period 117,795,000 107,516,000
Environmental provisions    
Reconciliation of changes in other provisions [abstract]    
Balance at beginning of period 1,611,000 2,083,000
Provisions reversed with a credit to income (533,000)  
Amounts used (339,000) (328,000)
Exchange differences and others 157,000 (144,000)
Balance at end of period 896,000 1,611,000
Provisions for litigation in progress    
Reconciliation of changes in other provisions [abstract]    
Balance at beginning of period 2,203,000 7,913,000
Charges for the year 2,887,000 1,705,000
Provisions reversed with a credit to income (318,000) (2,803,000)
Amounts used (1,874,000) (6,644,000)
Exchange differences and others 442,000 2,032,000
Balance at end of period 3,340,000 2,203,000
Provisions for third-party liabilities    
Reconciliation of changes in other provisions [abstract]    
Balance at beginning of period 8,263,000 10,596,000
Charges for the year 365,000 476,000
Amounts used (396,000) (247,000)
Remeasurement through other comprehensive income (loss) (1,346,000) (1,942,000)
Exchange differences and others 1,077,000 (620,000)
Balance at end of period 7,963,000 8,263,000
Provisions for Carbon dioxide emissions allowances    
Reconciliation of changes in other provisions [abstract]    
Balance at beginning of period 72,321,000 90,471,000
Charges for the year 77,518,000 72,427,000
Amounts used (74,052,000) (84,621,000)
Exchange differences and others 8,978,000 (5,956,000)
Balance at end of period 84,765,000 72,321,000
Provision for restructuring cost    
Reconciliation of changes in other provisions [abstract]    
Balance at beginning of period 5,735,000 15,243,000
Provisions reversed with a credit to income (1,307,000) (4,422,000)
Amounts used (3,627,000) (4,248,000)
Exchange differences and others 734,000 (838,000)
Balance at end of period 1,535,000 5,735,000
Other provisions    
Reconciliation of changes in other provisions [abstract]    
Balance at beginning of period 17,383,000 16,421,000
Charges for the year 3,702,000 3,221,000
Provisions reversed with a credit to income (2,881,000) (1,359,000)
Amounts used (222,000) (314,000)
Exchange differences and others 1,314,000 (586,000)
Balance at end of period $ 19,296,000 $ 17,383,000