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Accounts Payable and Accrued Liabilities
 12 Months Ended
Dec. 31, 2025
Payables and Accruals [Abstract]  
Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities
Accounts payable and accrued liabilities consisted of the following:
December 31,
(dollars in millions)20252024
Accounts payable$24.4 $13.4 
Accrued liabilities
Research and development expenses18.2 25.9 
Employee expenses17.5 22.4 
Income taxes4.8 3.2 
General and administrative and commercial expenses
3.7 5.1 
Professional fees0.9 1.8 
Accounts payable and accrued liabilities$69.5 $71.8