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Derivatives and Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2025
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, 2025
|  | Total gain recognized in income |  |  |  | Loss realized in income on derivatives |  | Unrealized gain recognized in income on derivatives
Derivative Instrument | Classification |  |  |
|  | (Dollars in millions)
Foreign currency option contracts | Operating costs and expenses | $ | 3.3 |  |  |  |  | $ | (2.7) |  |  | $ | 6.0 |
Total |  | $ | 3.3 |  |  |  |  | $ | (2.7) |  |  | $ | 6.0 |
|  | 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 |
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, 2025
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Foreign currency option contracts | $ | — |  |  | $ | 2.7 |  |  | $ | — |  |  | $ | 2.7 |
Total net assets | $ | — |  |  | $ | 2.7 |  |  | $ | — |  |  | $ | 2.7 |
| 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) |
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,
| 2025 |  | 2024
| (Dollars in millions)
Total debt at par value | $ | 340.8 |  |  | $ | 354.4 |
Less: Unamortized debt issuance costs | (4.4) |  |  | (6.3) |
Net carrying amount | $ | 336.4 |  |  | $ | 348.1 |
Estimated fair value | $ | 557.8 |  |  | $ | 438.0 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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