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Derivatives and Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping | The fair value of derivatives reflected in the accompanying consolidated balance sheets are set forth in the table below.
| December 31, 2020 |  | December 31, 2019
| Asset Derivative |  | Liability Derivative |  | Asset Derivative |  | Liability Derivative
| (Dollars in millions)
Foreign currency option contracts | $ | 10.3 |  |  | $ | — |  |  | $ | 1.1 |  |  | $ | — |
Coal contracts related to forecasted sales | 0.9 |  |  | (8.8) |  |  | 20.1 |  |  | (0.1) |
Coal trading contracts | 23.4 |  |  | (23.1) |  |  | 81.1 |  |  | (74.2) |
Total derivatives | 34.6 |  |  | (31.9) |  |  | 102.3 |  |  | (74.3) |
Effect of counterparty netting | (30.2) |  |  | 30.2 |  |  | (74.3) |  |  | 74.3 |
Variation margin posted (held) | 6.5 |  |  | — |  |  | (22.1) |  |  | — |
Net derivatives and margin as classified in the balance sheets | $ | 10.9 |  |  | $ | (1.7) |  |  | $ | 5.9 |  |  | $ | — |
Derivative Instruments, Gain (Loss) | The tables below show the amounts of pre-tax gains and losses related to the Company’s derivatives.
|  | Year Ended December 31, 2020
|  | Total gain (loss) recognized in income |  |  |  | Gain realized in income on derivatives |  | Unrealized gain (loss) recognized in income on derivatives
Financial Instrument |  |  |  |
|  | (Dollars in millions)
Foreign currency option contracts |  | $ | 12.9 |  |  |  |  | $ | 5.8 |  |  | $ | 7.1 |
Coal contracts related to forecasted sales |  | (23.8) |  |  |  |  | 5.8 |  |  | (29.6) |
Coal trading contracts |  | (0.7) |  |  |  |  | 4.2 |  |  | (4.9) |
Total |  | $ | (11.6) |  |  |  |  | $ | 15.8 |  |  | $ | (27.4) |
|  | Year Ended December 31, 2019
|  | Total (loss) gain recognized in income |  |  |  | (Loss) gain realized in income on derivatives |  | Unrealized gain recognized in income on derivatives
Financial Instrument |  |  |  |
|  | (Dollars in millions)
Foreign currency option contracts |  | $ | (3.7) |  |  |  |  | $ | (4.9) |  |  | $ | 1.2 |
Coal contracts related to forecasted sales |  | 67.6 |  |  |  |  | 25.4 |  |  | 42.2 |
Coal trading contracts |  | (0.3) |  |  |  |  | (8.7) |  |  | 8.4 |
Total |  | $ | 63.6 |  |  |  |  | $ | 11.8 |  |  | $ | 51.8 |
|  | Year Ended December 31, 2018
|  | Total (loss) gain recognized in income |  |  |  | (Loss) gain realized in income on derivatives |  | Unrealized (loss) gain recognized in income on derivatives
Financial Instrument |  |  |  |
|  | (Dollars in millions)
Foreign currency option contracts |  | $ | (9.1) |  |  |  |  | $ | (8.4) |  |  | $ | (0.7) |
Coal contracts related to forecasted sales |  | 115.7 |  |  |  |  | 97.4 |  |  | 18.3 |
Coal trading contracts |  | (2.9) |  |  |  |  | (5.3) |  |  | 2.4 |
Total |  | $ | 103.7 |  |  |  |  | $ | 83.7 |  |  | $ | 20.0 |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following tables set forth the hierarchy of the Company’s net financial asset positions for which fair value is measured on a recurring basis:
| December 31, 2020
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Foreign currency option contracts | $ | — |  |  | $ | 10.3 |  |  | $ | — |  |  | $ | 10.3 |
Coal contracts related to forecasted sales | — |  |  | (7.9) |  |  | — |  |  | (7.9) |
Coal trading contracts | — |  |  | 6.8 |  |  | — |  |  | 6.8 |
Equity securities | — |  |  | — |  |  | 4.0 |  |  | 4.0 |
Total net financial assets | $ | — |  |  | $ | 9.2 |  |  | $ | 4.0 |  |  | $ | 13.2 |
| December 31, 2019
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Foreign currency option contracts | $ | — |  |  | $ | 1.1 |  |  | $ | — |  |  | $ | 1.1 |
Coal contracts related to forecasted sales | — |  |  | 21.2 |  |  | — |  |  | 21.2 |
Coal trading contracts | — |  |  | (16.4) |  |  | — |  |  | (16.4) |
Equity securities | — |  |  | — |  |  | 4.0 |  |  | 4.0 |
Total net financial assets | $ | — |  |  | $ | 5.9 |  |  | $ | 4.0 |  |  | $ | 9.9 |
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,
| 2020 |  | 2019
| (Dollars in millions)
Total debt at par value | $ | 1,591.3 |  |  | $ | 1,367.2 |
Less: Unamortized debt issuance costs and original issue discount | (43.5) |  |  | (56.4) |
Net carrying amount | $ | 1,547.8 |  |  | $ | 1,310.8 |
Estimated fair value | $ | 987.6 |  |  | $ | 1,271.1 |
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,
|  | 2020 |  | 2019 |  | 2018
|  | (Dollars in millions)
Beginning of period |  | $ | 4.0 |  |  | $ | 10.0 |  |  | $ | — |
Included in earnings |  | — |  |  | (9.0) |  |  | (1.7) |
Purchases |  | — |  |  | 3.0 |  |  | 10.0 |
Settlements |  | — |  |  | — |  |  | 1.7 |
End of period |  | $ | 4.0 |  |  | $ | 4.0 |  |  | $ | 10.0 |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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