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Accrued Expenses
 12 Months Ended
Dec. 31, 2021
Payables and Accruals [Abstract]  
Accrued Expenses Accrued Expenses
Accrued expenses consisted of the following:
December 31,
(dollars in millions)20212020
Employee expenses$12.4 $9.0 
Research and development expenses9.5 8.1 
Professional fees and other1.2 1.8 
$23.1 $18.9