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Accounts Payable and Accrued Liabilities
3 Months Ended
Mar. 31, 2023
Payables and Accruals [Abstract]  
Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities
Accounts payable and accrued liabilities consisted of the following:
(dollars in millions)March 31,
2023
December 31,
2022
Accounts payable$12.3 $5.7 
Accrued liabilities
Research and development expenses34.9 35.9 
Income taxes10.1 10.3 
Employee expenses7.2 18.7 
Professional fees and other1.5 4.1 
Total accounts payable and accrued liabilities$66.0 $74.7