Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2024-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Land and buildings [abstract] | |||
| Land and buildings |
31,100,000
USD
|
33,600,000
USD
|
— |
| Construction in progress |
20,300,000
USD
|
180,900,000
USD
|
— |
| Other property, plant and equipment |
2,300,000
USD
|
4,000,000
USD
|
— |
| Property, plant and equipment |
84,700,000
USD
|
258,700,000
USD
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
0
USD
|
800,000
USD
|
— |
| Trade and other non-current receivables [abstract] | |||
| Other non-current receivables |
200,000
USD
|
400,000
USD
|
— |
| Trade and other current receivables [abstract] | |||
| Current prepayments and current accrued income other than current contract assets [abstract] | |||
| Current prepayments [abstract] | |||
| Current prepayments |
9,400,000
USD
|
8,700,000
USD
|
— |
| Trade and other current receivables |
16,200,000
USD
|
21,900,000
USD
|
— |
| Current prepayments and current accrued income including current contract assets [abstract] | |||
| Classes of current inventories [abstract] | |||
| Current inventories |
27,400,000
USD
|
58,500,000
USD
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
10,300,000
USD
|
170,900,000
USD
|
105,300,000
USD
|
| Miscellaneous current assets [abstract] | |||
| Current restricted cash and cash equivalents |
600,000
USD
|
600,000
USD
|
— |
| Classes of other provisions [abstract] | |||
| Other provisions [abstract] | |||
| Other non-current provisions |
26,300,000
USD
|
23,800,000
USD
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
251,600,000
USD
|
253,000,000
USD
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
101,000,000
USD
|
30,900,000
USD
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other non-current payables [abstract] | |||
| Non-current accruals and non-current deferred income including non-current contract liabilities [abstract] | |||
| Non-current deferred income including non-current contract liabilities [abstract] | |||
| Non-current contract liabilities [abstract] | |||
| Non-current advances received, representing non-current contract liabilities for performance obligations satisfied at point in time |
33,400,000
USD
|
24,900,000
USD
|
— |
| Trade and other current payables [abstract] | |||
| Current accruals and current deferred income including current contract liabilities [abstract] | |||
| Current deferred income including current contract liabilities [abstract] | |||
| Current contract liabilities [abstract] | |||
| Current advances received, representing current contract liabilities for performance obligations satisfied at point in time |
1,200,000
USD
|
5,700,000
USD
|
— |
| Trade and other current payables |
60,200,000
USD
|
60,700,000
USD
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current net defined benefit liability |
3,300,000
USD
|
7,000,000
USD
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
172,100,000
USD
|
552,900,000
USD
|
— |
| Liabilities |
550,200,000
USD
|
476,500,000
USD
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
63,800,000
USD
|
260,700,000
USD
|
— |
| Current liabilities |
179,600,000
USD
|
104,800,000
USD
|
— |
| Assets less current liabilities [abstract] |