Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Land and buildings [abstract] | |||
| Land and buildings |
33,300,000
USD
|
35,600,000
USD
|
— |
| Construction in progress |
12,500,000
USD
|
6,100,000
USD
|
— |
| Other property, plant and equipment |
2,600,000
USD
|
3,100,000
USD
|
— |
| Property, plant and equipment |
83,100,000
USD
|
95,400,000
USD
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
900,000
USD
|
1,000,000
USD
|
— |
| Trade and other non-current receivables [abstract] | |||
| Other non-current receivables |
0
USD
|
1,100,000
USD
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
29,600,000
USD
|
27,500,000
USD
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
33,100,000
USD
|
41,300,000
USD
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
110,500,000
USD
|
134,900,000
USD
|
29,400,000
USD
|
| Miscellaneous current assets [abstract] | |||
| Current restricted cash and cash equivalents |
4,400,000
USD
|
4,500,000
USD
|
— |
| Classes of other provisions [abstract] | |||
| Other provisions [abstract] | |||
| Other non-current provisions |
20,200,000
USD
|
14,700,000
USD
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
115,200,000
USD
|
118,000,000
USD
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
11,300,000
USD
|
29,800,000
USD
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| 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 |
200,000
USD
|
0
USD
|
— |
| Trade and other current payables |
29,400,000
USD
|
26,100,000
USD
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current net defined benefit liability |
13,400,000
USD
|
18,900,000
USD
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current derivative financial liabilities |
0
USD
|
1,500,000
USD
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
294,900,000
USD
|
341,400,000
USD
|
— |
| Liabilities |
261,600,000
USD
|
282,500,000
USD
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
177,600,000
USD
|
208,200,000
USD
|
— |
| Current liabilities |
43,500,000
USD
|
59,600,000
USD
|
— |
| Assets less current liabilities [abstract] |