Accounts Payable and Accrued Liabilities (Tables)

12 Months Ended

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