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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,
			2022						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")			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 obligation			3.3						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
2024			5.5
2025			—
2026			35.0
2027			—
2028-Thereafter			500.0
Total			$	543.8

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Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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Tabular disclosure of maturity and sinking fund requirement for long-term debt.

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