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Derivatives and Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Derivative Instruments, Gain (Loss)

The tables below show the amounts of pretax gains and losses related to the Company’s derivatives and their classification within the accompanying consolidated statements of operations.

						Year Ended December 31, 2024
						Total loss recognized in income												Loss realized in income on derivatives						Unrealized loss recognized in income on derivatives
Derivative Instrument			Classification
						(Dollars in millions)
Foreign currency option contracts			Operating costs and expenses			$	(12.7)											$	(3.7)					$	(9.0)
Total						$	(12.7)											$	(3.7)					$	(9.0)

						Year Ended December 31, 2023
						Total (loss) gain recognized in income												(Loss) gain realized in income on derivatives						Unrealized gain (loss) recognized in income on derivatives
Derivative Instrument			Classification
						(Dollars in millions)
Foreign currency option contracts			Operating costs and expenses			$	(1.9)											$	(9.3)					$	7.4
Derivative contracts related to forecasted sales			Revenue			78.1												(80.9)						159.0
Financial trading contracts			Revenue			—												11.5						(11.5)
Total						$	76.2											$	(78.7)					$	154.9

						Year Ended December 31, 2022
						Total (loss) gain recognized in income												(Loss) gain realized in income on derivatives						Unrealized (loss) gain recognized in income on derivatives
Derivative Instrument			Classification
						(Dollars in millions)
Foreign currency option contracts			Operating costs and expenses			$	(8.4)											$	(6.1)					$	(2.3)
Derivative contracts related to forecasted sales			Revenue			(490.9)												(455.1)						(35.8)
Financial trading contracts			Revenue			10.7												1.1						9.6
Total						$	(488.6)											$	(460.1)					$	(28.5)

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following tables set forth the hierarchy of the Company’s net asset (liability) positions for which fair value is measured on a recurring basis.

			December 31, 2024
			Level 1						Level 2						Level 3						Total
			(Dollars in millions)
Foreign currency option contracts			$	—					$	(3.6)					$	—					$	(3.6)
Equity securities			1.0						—						—						1.0
Total net assets (liabilities)			$	1.0					$	(3.6)					$	—					$	(2.6)
			December 31, 2023
			Level 1						Level 2						Level 3						Total
			(Dollars in millions)
Foreign currency option contracts			$	—					$	6.2					$	—					$	6.2
Equity securities			0.4						—						—						0.4
Total net assets			$	0.4					$	6.2					$	—					$	6.6

Carrying Amounts And Estimated Fair Values Of Company's Debt

The fair value of debt, shown below, is principally based on reported market values and estimates based on interest rates, maturities, credit risk, underlying collateral and completed market transactions.

			December 31,
			2024						2023
			(Dollars in millions)
Total debt at par value			$	354.4					$	342.3
Less: Unamortized debt issuance costs			(6.3)						(8.1)
Net carrying amount			$	348.1					$	334.2
Estimated fair value			$	438.0					$	483.9

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

The following table summarizes the changes in the Company’s recurring Level 3 net financial assets:

						Year Ended December 31,
						2024						2023						2022
						(Dollars in millions)
Beginning of period						$	—					$	2.5					$	4.0
Impairment loss included in earnings						—						(2.0)						(1.7)
Purchases						—						—						0.2
Exchange						—						(0.5)						—
End of period						$	—					$	—					$	2.5

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Carrying amounts and estimated fair values of the Company's debt.

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Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.

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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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