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Right-of-Use Assets and Liabilities (Tables)
 3 Months Ended
Mar. 31, 2023
Leases [Abstract]  
Components of Lease Expense
The components of lease expense were as follows:
 Three Months Ended
March 31,
(dollars in millions)20232022
Operating lease cost$0.5 $0.6 
Schedule of Supplemental Cash Flow Information Related to Leases
Supplemental cash flow information related to leases was as follows:
Three Months Ended
March 31,
(dollars in millions)20232022
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows from operating leases$0.5 $0.6 
Supplemental non-cash information:
Right-of-use assets obtained in exchange for new lease obligations$— $2.4 
Schedule of Maturities of Operating Lease Liabilities
Maturities of operating lease liabilities as of March 31, 2023, were as follows:
(dollars in millions)
Remainder of 2023$1.5 
20242.2 
20250.5 
2026— 
Total lease payments4.2 
Less: imputed interest(0.2)
Total$4.0