Statement Of Financial Position [Abstract]
| Concept |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||
| Assets [abstract] | |||||||||||||||
| Non-current assets [abstract] | |||||||||||||||
| Property, plant and equipment | — | — | — |
279,300,000
USD
|
— |
381,000,000
USD
|
— | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — | — |
500,000
USD
|
— |
800,000
USD
|
— | — | — | — | — | — | — | — | — |
| Intangible assets other than goodwill | — | — | — |
18,200,000
USD
|
— |
16,500,000
USD
|
— | — | — | — | — | — | — | — | — |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements | — | — | — |
–
USD
|
— |
–
USD
|
— | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — |
356,600,000
USD
|
— |
457,400,000
USD
|
— | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||
| Current inventories | — | — | — |
3,300,000
USD
|
— |
7,200,000
USD
|
— | — | — | — | — | — | — | — | — |
| Trade and other current receivables | — | — | — |
62,300,000
USD
|
— |
60,900,000
USD
|
— | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
32,600,000
USD
|
— |
45,300,000
USD
|
— | — | — | — |
27,100,000
USD
|
— | — | — | — |
| Current assets | — | — | — |
100,400,000
USD
|
— |
115,500,000
USD
|
— | — | — | — | — | — | — | — | — |
| Assets | — | — | — |
457,000,000
USD
|
— |
572,900,000
USD
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital | — | — | — |
33,700,000
USD
|
— |
34,300,000
USD
|
— | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — |
73,600,000
USD
|
— |
15,300,000
USD
|
— | — | — | — | — | — | — | — | — |
| Share premium | — | — | — |
58,000,000
USD
|
— |
58,000,000
USD
|
— | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — |
255,400,000
USD
|
— |
253,600,000
USD
|
— | — | — | — | — | — | — | — | — |
| Equity |
58,000,000
USD
|
33,700,000
USD
|
73,600,000
USD
|
273,500,000
USD
|
255,400,000
USD
|
330,600,000
USD
|
58,000,000
USD
|
15,300,000
USD
|
34,300,000
USD
|
253,600,000
USD
|
304,400,000
USD
|
39,000,000
USD
|
250,500,000
USD
|
58,000,000
USD
|
34,900,000
USD
|
| Liabilities [abstract] | |||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||
| Non-current provisions | — | — | — |
53,800,000
USD
|
— |
54,300,000
USD
|
— | — | — | — | — | — | — | — | — |
| Trade and other non-current payables | — | — | — |
500,000
USD
|
— |
900,000
USD
|
— | — | — | — | — | — | — | — | — |
| Deferred tax liabilities | — | — | — |
68,200,000
USD
|
— |
92,900,000
USD
|
— | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — | — |
133,700,000
USD
|
— |
183,200,000
USD
|
— | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||
| Trade and other current payables | — | — | — |
14,200,000
USD
|
— |
14,000,000
USD
|
— | — | — | — | — | — | — | — | — |
| Current liabilities | — | — | — |
49,800,000
USD
|
— |
59,100,000
USD
|
— | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — |
183,500,000
USD
|
— |
242,300,000
USD
|
— | — | — | — | — | — | — | — | — |