Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Other intangible assets |
74,900,000
USD
|
73,400,000
USD
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current restricted cash and cash equivalents |
53,400,000
USD
|
59,200,000
USD
|
— |
| Other non-current assets |
34,100,000
USD
|
28,600,000
USD
|
— |
| Trade and other current receivables [abstract] | |||
| Current trade receivables |
173,100,000
USD
|
169,400,000
USD
|
— |
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
177,700,000
USD
|
363,800,000
USD
|
170,000,000
USD
|
| Miscellaneous current assets [abstract] | |||
| Current restricted cash and cash equivalents |
5,000,000
USD
|
11,600,000
USD
|
— |
| Other current assets |
79,600,000
USD
|
61,700,000
USD
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
623,400,000
USD
|
659,700,000
USD
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings and current portion of non-current borrowings |
131,100,000
USD
|
367,100,000
USD
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Current borrowings and current portion of non-current borrowings, by type [abstract] | |||
| Trade and other current payables [abstract] | |||
| Current trade payables |
69,200,000
USD
|
45,600,000
USD
|
— |
| Current accruals and current deferred income including current contract liabilities [abstract] | |||
| Current deferred income including current contract liabilities [abstract] | |||
| Current deferred income including current contract liabilities |
206,000,000
USD
|
154,400,000
USD
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Other non-current liabilities |
3,700,000
USD
|
4,300,000
USD
|
— |
| Issued capital [abstract] | |||
| Issued capital |
325,900,000
USD
|
313,200,000
USD
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
856,300,000
USD
|
834,600,000
USD
|
— |
| Miscellaneous equity [abstract] | |||
| Additional paid-in capital |
1,063,900,000
USD
|
1,035,800,000
USD
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
1,816,600,000
USD
|
1,953,300,000
USD
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
572,500,000
USD
|
751,400,000
USD
|
— |
| Current liabilities |
616,700,000
USD
|
724,600,000
USD
|
— |
| Assets less current liabilities [abstract] |