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Debt and Financing Obligations (Tables)
12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Schedule of long-term debt instruments Total debt and financing obligations consisted of the following:
 December 31,
 20222021
 (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")
35.0 115.0 
5.346 percent financing obligation, due 2024
8.8 12.0 
Total borrowings$543.8 $627.0 
Debt issuance costs(11.6)(13.4)
Total debt and financing obligation$532.2 $613.6 
Less: current portion of long-term debt and financing obligation3.3 3.2 
Total long-term debt and financing obligation$528.9 $610.4 
Schedule of maturities of long-term debt As of December 31, 2022, the combined aggregate amount of maturities for long-term borrowings for each of the next five years is as follows:
(Dollars in millions)
2023$3.3 
20245.5 
2025— 
202635.0 
2027— 
2028-Thereafter500.0 
Total$543.8