Property, plant and equipment - Detail net of accumulated depreciation and impairment (Details) - USD ($)
|
12 Months Ended |
Dec. 31, 2025 |
Dec. 31, 2024 |
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
$ 487,196,000
|
|
| Property, plant and equipment at end of the year |
486,678,000
|
$ 487,196,000
|
| Land and Buildings |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
58,562,000
|
|
| Property, plant and equipment at end of the year |
60,271,000
|
58,562,000
|
| Plant and Machinery |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
276,356,000
|
|
| Property, plant and equipment at end of the year |
262,658,000
|
276,356,000
|
| Other Fixtures, Tools and Furniture |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
8,556,000
|
|
| Property, plant and equipment at end of the year |
9,110,000
|
8,556,000
|
| Property, Plant and Equipment in the Course of Construction |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
43,962,000
|
|
| Property, plant and equipment at end of the year |
47,627,000
|
43,962,000
|
| Mineral Reserves |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
66,663,000
|
|
| Property, plant and equipment at end of the year |
63,126,000
|
66,663,000
|
| Other Items of Property, Plant and Equipment |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
1,030,000
|
|
| Property, plant and equipment at end of the year |
4,910,000
|
1,030,000
|
| Other Items of Leased Plant and machinery |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
18,539,000
|
|
| Property, plant and equipment at end of the year |
19,401,000
|
18,539,000
|
| Other Items of Leased Land and Buildings |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
13,527,000
|
|
| Property, plant and equipment at end of the year |
19,575,000
|
13,527,000
|
| Gross carrying amount |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
1,703,354,000
|
1,699,092,000
|
| Additions |
83,415,000
|
102,471,000
|
| Disposals and other |
(58,569,000)
|
(34,109,000)
|
| Transfers from/(to) other accounts |
(642,000)
|
|
| Exchange differences |
132,632,000
|
(64,100,000)
|
| Property, plant and equipment at end of the year |
1,860,190,000
|
1,703,354,000
|
| Gross carrying amount | Land and Buildings |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
226,048,000
|
181,037,000
|
| Additions |
38,000
|
65,000
|
| Disposals and other |
(2,116,000)
|
(97,000)
|
| Transfers from/(to) other accounts |
2,032,000
|
51,924,000
|
| Exchange differences |
22,841,000
|
(6,881,000)
|
| Property, plant and equipment at end of the year |
248,843,000
|
226,048,000
|
| Gross carrying amount | Plant and Machinery |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
1,214,411,000
|
1,197,462,000
|
| Additions |
545,000
|
3,415,000
|
| Disposals and other |
(47,295,000)
|
(28,173,000)
|
| Transfers from/(to) other accounts |
75,586,000
|
87,623,000
|
| Exchange differences |
93,792,000
|
(45,916,000)
|
| Property, plant and equipment at end of the year |
1,337,039,000
|
1,214,411,000
|
| Gross carrying amount | Other Fixtures, Tools and Furniture |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
17,477,000
|
7,205,000
|
| Additions |
521,000
|
5,693,000
|
| Disposals and other |
(775,000)
|
(993,000)
|
| Transfers from/(to) other accounts |
289,000
|
6,369,000
|
| Exchange differences |
2,177,000
|
(797,000)
|
| Property, plant and equipment at end of the year |
19,689,000
|
17,477,000
|
| Gross carrying amount | Property, Plant and Equipment in the Course of Construction |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
66,032,000
|
145,206,000
|
| Additions |
66,987,000
|
76,097,000
|
| Disposals and other |
(57,000)
|
|
| Transfers from/(to) other accounts |
(78,529,000)
|
(148,021,000)
|
| Exchange differences |
5,333,000
|
(7,250,000)
|
| Property, plant and equipment at end of the year |
59,766,000
|
66,032,000
|
| Gross carrying amount | Mineral Reserves |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
69,714,000
|
67,091,000
|
| Transfers from/(to) other accounts |
(3,377,000)
|
2,700,000
|
| Exchange differences |
365,000
|
(77,000)
|
| Property, plant and equipment at end of the year |
66,702,000
|
69,714,000
|
| Gross carrying amount | Other Items of Property, Plant and Equipment |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
29,712,000
|
33,706,000
|
| Additions |
516,000
|
150,000
|
| Disposals and other |
(37,000)
|
|
| Transfers from/(to) other accounts |
3,357,000
|
(3,813,000)
|
| Exchange differences |
1,247,000
|
(331,000)
|
| Property, plant and equipment at end of the year |
34,795,000
|
29,712,000
|
| Gross carrying amount | Other Items of Leased Plant and machinery |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
51,524,000
|
41,314,000
|
| Additions |
7,635,000
|
13,201,000
|
| Disposals and other |
(4,727,000)
|
(4,579,000)
|
| Transfers from/(to) other accounts |
|
3,218,000
|
| Exchange differences |
4,065,000
|
(1,630,000)
|
| Property, plant and equipment at end of the year |
58,497,000
|
51,524,000
|
| Gross carrying amount | Other Items of Leased Land and Buildings |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
28,436,000
|
26,071,000
|
| Additions |
7,173,000
|
3,850,000
|
| Disposals and other |
(3,562,000)
|
(267,000)
|
| Exchange differences |
2,812,000
|
(1,218,000)
|
| Property, plant and equipment at end of the year |
34,859,000
|
28,436,000
|
| Accumulated depreciation |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(1,000,207,000)
|
(997,127,000)
|
| Disposals and other |
43,522,000
|
30,959,000
|
| Transfers from/(to) other accounts |
80,000
|
|
| Exchange differences |
(88,082,000)
|
40,950,000
|
| Depreciation and amortization for the period |
(83,035,000)
|
(74,989,000)
|
| Property, plant and equipment at end of the year |
(1,127,722,000)
|
(1,000,207,000)
|
| Accumulated depreciation | Land and Buildings |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(133,167,000)
|
(119,009,000)
|
| Disposals and other |
2,116,000
|
101,000
|
| Transfers from/(to) other accounts |
64,000
|
(15,742,000)
|
| Exchange differences |
(11,768,000)
|
4,486,000
|
| Depreciation and amortization for the period |
(2,934,000)
|
(3,003,000)
|
| Property, plant and equipment at end of the year |
(145,689,000)
|
(133,167,000)
|
| Accumulated depreciation | Plant and Machinery |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(801,564,000)
|
(821,272,000)
|
| Disposals and other |
33,455,000
|
25,847,000
|
| Transfers from/(to) other accounts |
195,000
|
20,285,000
|
| Exchange differences |
(70,610,000)
|
33,987,000
|
| Depreciation and amortization for the period |
(68,832,000)
|
(60,411,000)
|
| Property, plant and equipment at end of the year |
(907,356,000)
|
(801,564,000)
|
| Accumulated depreciation | Other Fixtures, Tools and Furniture |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(5,993,000)
|
(1,149,000)
|
| Disposals and other |
255,000
|
165,000
|
| Transfers from/(to) other accounts |
(68,000)
|
(4,981,000)
|
| Exchange differences |
(724,000)
|
361,000
|
| Depreciation and amortization for the period |
(273,000)
|
(389,000)
|
| Property, plant and equipment at end of the year |
(6,803,000)
|
(5,993,000)
|
| Accumulated depreciation | Mineral Reserves |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(3,051,000)
|
(2,840,000)
|
| Depreciation and amortization for the period |
(525,000)
|
(211,000)
|
| Property, plant and equipment at end of the year |
(3,576,000)
|
(3,051,000)
|
| Accumulated depreciation | Other Items of Property, Plant and Equipment |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(10,146,000)
|
(10,317,000)
|
| Disposals and other |
37,000
|
|
| Exchange differences |
(1,068,000)
|
353,000
|
| Depreciation and amortization for the period |
(166,000)
|
(182,000)
|
| Property, plant and equipment at end of the year |
(11,343,000)
|
(10,146,000)
|
| Accumulated depreciation | Other Items of Leased Plant and machinery |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(32,204,000)
|
(30,244,000)
|
| Disposals and other |
4,097,000
|
4,579,000
|
| Transfers from/(to) other accounts |
(111,000)
|
438,000
|
| Exchange differences |
(2,608,000)
|
1,234,000
|
| Depreciation and amortization for the period |
(7,672,000)
|
(8,211,000)
|
| Property, plant and equipment at end of the year |
(38,498,000)
|
(32,204,000)
|
| Accumulated depreciation | Other Items of Leased Land and Buildings |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(14,082,000)
|
(12,296,000)
|
| Disposals and other |
3,562,000
|
267,000
|
| Exchange differences |
(1,304,000)
|
529,000
|
| Depreciation and amortization for the period |
(2,633,000)
|
(2,582,000)
|
| Property, plant and equipment at end of the year |
(14,457,000)
|
(14,082,000)
|
| Impairment |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(215,951,000)
|
(200,568,000)
|
| Disposals and other |
15,092,000
|
1,342,000
|
| Exchange differences |
(17,029,000)
|
8,215,000
|
| Impairment losses for the period |
(27,902,000)
|
(24,940,000)
|
| Property, plant and equipment at end of the year |
(245,790,000)
|
(215,951,000)
|
| Impairment | Land and Buildings |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(34,319,000)
|
(22,680,000)
|
| Transfers from/(to) other accounts |
|
(11,166,000)
|
| Exchange differences |
(2,104,000)
|
415,000
|
| Impairment losses for the period |
(6,460,000)
|
(888,000)
|
| Property, plant and equipment at end of the year |
(42,883,000)
|
(34,319,000)
|
| Impairment | Plant and Machinery |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(136,491,000)
|
(77,617,000)
|
| Disposals and other |
14,078,000
|
1,342,000
|
| Transfers from/(to) other accounts |
(19,011,000)
|
(45,529,000)
|
| Exchange differences |
(12,054,000)
|
3,418,000
|
| Impairment losses for the period |
(13,547,000)
|
(18,105,000)
|
| Property, plant and equipment at end of the year |
(167,025,000)
|
(136,491,000)
|
| Impairment | Other Fixtures, Tools and Furniture |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(2,928,000)
|
(2,752,000)
|
| Disposals and other |
384,000
|
|
| Transfers from/(to) other accounts |
|
877,000
|
| Exchange differences |
(402,000)
|
299,000
|
| Impairment losses for the period |
(830,000)
|
(1,352,000)
|
| Property, plant and equipment at end of the year |
(3,776,000)
|
(2,928,000)
|
| Impairment | Property, Plant and Equipment in the Course of Construction |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(22,070,000)
|
(78,150,000)
|
| Transfers from/(to) other accounts |
19,011,000
|
55,817,000
|
| Exchange differences |
(2,400,000)
|
4,047,000
|
| Impairment losses for the period |
(6,680,000)
|
(3,784,000)
|
| Property, plant and equipment at end of the year |
(12,139,000)
|
(22,070,000)
|
| Impairment | Other Items of Property, Plant and Equipment |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(18,536,000)
|
(18,542,000)
|
| Exchange differences |
(6,000)
|
6,000
|
| Property, plant and equipment at end of the year |
(18,542,000)
|
(18,536,000)
|
| Impairment | Other Items of Leased Plant and machinery |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(781,000)
|
|
| Disposals and other |
630,000
|
|
| Exchange differences |
(63,000)
|
30,000
|
| Impairment losses for the period |
(385,000)
|
(811,000)
|
| Property, plant and equipment at end of the year |
(599,000)
|
(781,000)
|
| Impairment | Other Items of Leased Land and Buildings |
|
|
| Reconciliation of changes in property, plant and equipment [abstract] |
|
|
| Property, plant and equipment at beginning of the year |
(827,000)
|
(827,000)
|
| Property, plant and equipment at end of the year |
$ (827,000)
|
$ (827,000)
|