Statement Of Financial Position [Abstract]
| Concept |
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 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||
| Assets [abstract] | |||||||||||||||
| Non-current assets [abstract] | |||||||||||||||
| Property, plant and equipment |
399,800,000
USD
|
— | — | — | — |
435,700,000
USD
|
— | — | — | — | — | — | — | — | — |
| Right-of-use assets |
–
USD
|
— | — | — | — |
100,000
USD
|
— | — | — | — | — | — | — | — | — |
| Intangible assets other than goodwill |
12,400,000
USD
|
— | — | — | — |
1,500,000
USD
|
— | — | — | — | — | — | — | — | — |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements |
–
USD
|
— | — | — | — |
–
USD
|
— | — | — | — | — | — | — | — | — |
| Non-current assets |
460,300,000
USD
|
— | — | — | — |
483,200,000
USD
|
— | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||
| Current inventories |
10,700,000
USD
|
— | — | — | — |
17,700,000
USD
|
— | — | — | — | — | — | — | — | — |
| Trade and other current receivables |
28,100,000
USD
|
— | — | — | — |
22,900,000
USD
|
— | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
27,100,000
USD
|
— | — | — | — |
24,600,000
USD
|
— | — | — | — | — | — |
58,500,000
USD
|
— | — |
| Current assets |
129,400,000
USD
|
— | — | — | — |
65,800,000
USD
|
— | — | — | — | — | — | — | — | — |
| Assets |
589,700,000
USD
|
— | — | — | — |
549,000,000
USD
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital |
34,900,000
USD
|
— | — | — | — |
31,900,000
USD
|
— | — | — | — | — | — | — | — | — |
| Retained earnings |
39,000,000
USD
|
— | — | — | — |
36,600,000
USD
|
— | — | — | — | — | — | — | — | — |
| Share premium |
58,000,000
USD
|
— | — | — | — |
55,400,000
USD
|
— | — | — | — | — | — | — | — | — |
| Other reserves |
250,500,000
USD
|
— | — | — | — |
243,000,000
USD
|
— | — | — | — | — | — | — | — | — |
| Equity |
304,400,000
USD
|
39,000,000
USD
|
250,500,000
USD
|
58,000,000
USD
|
34,900,000
USD
|
293,700,000
USD
|
31,900,000
USD
|
36,600,000
USD
|
243,000,000
USD
|
55,400,000
USD
|
176,200,000
USD
|
246,600,000
USD
|
510,100,000
USD
|
55,400,000
USD
|
31,900,000
USD
|
| Liabilities [abstract] | |||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||
| Non-current provisions |
69,100,000
USD
|
— | — | — | — |
73,400,000
USD
|
— | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
91,200,000
USD
|
— | — | — | — |
85,500,000
USD
|
— | — | — | — | — | — | — | — | — |
| Non-current liabilities |
207,500,000
USD
|
— | — | — | — |
199,900,000
USD
|
— | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||
| Trade and other current payables |
30,600,000
USD
|
— | — | — | — |
35,600,000
USD
|
— | — | — | — | — | — | — | — | — |
| Liabilities included in disposal groups classified as held for sale |
8,500,000
USD
|
— | — | — | — |
–
USD
|
— | — | — | — | — | — | — | — | — |
| Current liabilities |
77,800,000
USD
|
— | — | — | — |
55,400,000
USD
|
— | — | — | — | — | — | — | — | — |
| Liabilities |
285,300,000
USD
|
— | — | — | — |
255,300,000
USD
|
— | — | — | — | — | — | — | — | — |