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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue Recognition [Abstract] |
Disaggregation of Revenues | Revenue by product type and market is set forth in the following tables. With respect to its seaborne mining segments, the Company classifies as “Export” certain revenue from domestically-delivered coal under contracts in which the price is derived on a basis similar to export contracts.
| Year Ended December 31, 2021
| Seaborne Thermal Mining |  | Seaborne Metallurgical Mining |  | Powder River Basin Mining |  | Other U.S. Thermal Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 173.5 |  |  | $ | — |  |  | $ | 970.7 |  |  | $ | 669.9 |  |  | $ | — |  |  | $ | 1,814.1 |
Export | 759.0 |  |  | — |  |  | — |  |  | 10.0 |  |  | — |  |  | 769.0 |
Total thermal | 932.5 |  |  | — |  |  | 970.7 |  |  | 679.9 |  |  | — |  |  | 2,583.1 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 719.8 |  |  | — |  |  | — |  |  | — |  |  | 719.8 |
Total metallurgical | — |  |  | 719.8 |  |  | — |  |  | — |  |  | — |  |  | 719.8 |
Other (2) | 1.5 |  |  | 7.9 |  |  | 0.5 |  |  | 9.2 |  |  | (3.7) |  |  | 15.4 |
Revenues | $ | 934.0 |  |  | $ | 727.7 |  |  | $ | 971.2 |  |  | $ | 689.1 |  |  | $ | (3.7) |  |  | $ | 3,318.3 |
| Year Ended December 31, 2020
| Seaborne Thermal Mining |  | Seaborne Metallurgical Mining |  | Powder River Basin Mining |  | Other U.S. Thermal Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 145.5 |  |  | $ | — |  |  | $ | 993.9 |  |  | $ | 675.2 |  |  | $ | — |  |  | $ | 1,814.6 |
Export | 564.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 564.8 |
Total thermal | 710.3 |  |  | — |  |  | 993.9 |  |  | 675.2 |  |  | — |  |  | 2,379.4 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 484.3 |  |  | — |  |  | — |  |  | — |  |  | 484.3 |
Total metallurgical | — |  |  | 484.3 |  |  | — |  |  | — |  |  | — |  |  | 484.3 |
Other (2) | 1.5 |  |  | 2.2 |  |  | (2.8) |  |  | 32.1 |  |  | (15.6) |  |  | 17.4 |
Revenues | $ | 711.8 |  |  | $ | 486.5 |  |  | $ | 991.1 |  |  | $ | 707.3 |  |  | $ | (15.6) |  |  | $ | 2,881.1 |
| Year Ended December 31, 2019
| Seaborne Thermal Mining |  | Seaborne Metallurgical Mining |  | Powder River Basin Mining |  | Other U.S. Thermal Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 147.9 |  |  | $ | — |  |  | $ | 1,208.9 |  |  | $ | 1,274.2 |  |  | $ | — |  |  | $ | 2,631.0 |
Export | 822.4 |  |  | — |  |  | — |  |  | 11.3 |  |  | — |  |  | 833.7 |
Total thermal | 970.3 |  |  | — |  |  | 1,208.9 |  |  | 1,285.5 |  |  | — |  |  | 3,464.7 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 1,030.0 |  |  | — |  |  | — |  |  | — |  |  | 1,030.0 |
Total metallurgical | — |  |  | 1,030.0 |  |  | — |  |  | — |  |  | — |  |  | 1,030.0 |
Other (2) | 1.4 |  |  | 3.1 |  |  | 19.8 |  |  | 23.9 |  |  | 80.5 |  |  | 128.7 |
Revenues | $ | 971.7 |  |  | $ | 1,033.1 |  |  | $ | 1,228.7 |  |  | $ | 1,309.4 |  |  | $ | 80.5 |  |  | $ | 4,623.4 |
Disaggregation of Revenue by Contract | (1) Corporate and Other revenue includes net losses of $113.7 million and $34.5 million and a net gain of $50.6 million related to unrealized mark-to-market adjustments on derivatives related to forecasted sales and other financial trading activity during the years ended December 31, 2021, 2020 and 2019, respectively. Refer to Note 7. “Derivatives and Fair Value Measurements” for additional information. Also included in Corporate and Other revenue are revenues with customers of $139.5 million, $(28.9) million and $(17.6) million during the years ended December 31, 2021, 2020 and 2019, respectively. (2) Other includes revenues from arrangements such as customer contract-related payments associated with volume shortfalls, royalties related to coal lease agreements, sales agency commissions, farm income and property and facility rentals.
Schedule of Accounts Receivable | “Accounts receivable, net” at December 31, 2021 and 2020 consisted of the following:
| December 31,
| 2021 |  | 2020
| (Dollars in millions)
Trade receivables, net | $ | 307.0 |  |  | $ | 180.9 |
Miscellaneous receivables, net | 43.5 |  |  | 63.9 |
Accounts receivable, net | $ | 350.5 |  |  | $ | 244.8 |

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