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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of minimum future principal payments on long-term debt
Minimum future principal payments on long-term debt as of December 31, 2021 are as follows:
(dollars in millions)
2023$— 
20240.2 
20250.2 
20260.2 
Thereafter0.4 
Total$1.0