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Accounts Payable and Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2022
Payables and Accruals [Abstract] |
Components of accounts payable and accrued liabilities | Accounts payable and accrued liabilities consisted of the following:
| December 31,
(dollars in millions) | 2022 |  | 2021
Accounts payable | $ | 5.7 |  |  | $ | 31.3 |
Accrued liabilities |  |  |
Research and development expenses | 35.9 |  |  | 9.5 |
Employee expenses | 18.7 |  |  | 12.4 |
Income taxes | 10.3 |  |  | — |
Professional fees and other | 4.1 |  |  | 1.2 |
| $ | 74.7 |  |  | $ | 54.4 |

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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