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Debt and Financing Obligation (Tables)
9 Months Ended
Sep. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Total Debt and Financing Obligation
Total debt and financing obligation, including the current portion of the financing obligation, consisted of the following:
September 30, 2022December 31, 2021
 
(Dollars in millions)
4.875 percent senior notes, due 2029 ("2029 Senior Notes")
$500.0 $500.0 
$350.0 revolving credit facility, due 2026 ("Revolving Facility")
67.0 115.0 
5.346 percent financing obligation, due 2024
9.6 12.0 
Total borrowings576.6 627.0 
Debt issuance costs(12.1)(13.4)
Total debt and financing obligation$564.5 $613.6 
Less: current portion of financing obligation3.3 3.2 
Total long-term debt and financing obligation$561.2 $610.4