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Leases (Tables) | 12 Months Ended
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Dec. 31, 2023
Presentation of leases for lessee [abstract] |
Schedule of changes in right-of-use assets |
| As at December 31 | As at December 31
(in millions of U.S. dollars) | 2023 | 2022
RIGHT-OF-USE- ASSETS |  |
Opening balance | 21.4 |  | 32.0 |
Additions | 4.3 |  | — |
Depreciation | (7.3) |  | (6.8) |
Disposals | (0.5) |  | (3.8) |
Total right-of-use-assets | 17.9 |  | 21.4 |
Schedule of maturity analysis of the Company's lease payments | See below for a maturity analysis of the Company’s lease payments:
|  | As at December 31 | As at December 31
(in millions of U.S. dollars) |  | 2023 | 2022
MATURITY ANALYSIS FOR LEASES |  |  |
Less than 1 year |  | 2.6 |  | 7.5 |
Between 1 and 3 years |  | 1.4 |  | 2.4 |
Between 3 and 5 years |  | 1.3 |  | 0.1 |
More than 5 years |  | 0.5 |  | — |
Total undiscounted lease payments(1) |  | 5.8 |  | 10.0 |
Carrying value of lease liabilities |  | 5.2 |  | 9.9 |
Less: current portion of lease liabilities(2) |  | (2.6) |  | (8.6) |
Non-current portion of lease liabilities |  | 2.6 |  | 1.3 |
1.Total undiscounted lease payments excludes leases that are classified as short term and leases for low value assets, which are not recognized as lease liabilities. 2.The current portion of the lease liabilities is included in trade and other payables on the statement of financial position.

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