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Property, Plant, Equipment and Mine Development | 9 Months Ended
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Sep. 30, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant, Equipment and Mine Development | Property, Plant, Equipment and Mine Development The composition of property, plant, equipment and mine development, net, as of September 30, 2021 and December 31, 2020 is set forth in the table below:
| September 30, 2021 |  | December 31, 2020
| (Dollars in millions)
Land and coal interests | $ | 2,470.9 |  |  | $ | 2,482.9 |
Buildings and improvements | 543.6 |  |  | 481.0 |
Machinery and equipment | 1,436.0 |  |  | 1,408.5 |
Less: Accumulated depreciation, depletion and amortization | (1,498.5) |  |  | (1,321.3) |
Property, plant, equipment and mine development, net | $ | 2,952.0 |  |  | $ | 3,051.1 |
Asset Impairment and Other At-Risk Assets During the nine months ended September 30, 2020, the Company recognized an asset impairment charge of $1,418.1 million related to its North Antelope Rochelle Mine of the Powder River Basin Mining segment. Of this amount, $1,393.7 million related to the property, plant, equipment and mine development assets; $19.9 million related to operating lease right-of-use assets; and $4.5 million related to contract-based intangible assets. The outlook for the mine was negatively impacted by the accelerated decline of coal-fired electricity generation in the U.S., driven by the reduced utilization of plants and plant retirements, sustained low natural gas pricing and the increased use of renewable energy sources. These factors led to the expectation of reduced future sales volumes. The impairment charge was based upon the remaining estimated discounted cash flows of the mine. Such cash flows were based upon estimates which generally constitute unobservable Level 3 inputs under the fair value hierarchy, including, but not limited to, future tons sold, coal prices for unpriced coal, production costs (including costs for labor, commodity supplies and contractors), transportation costs and a risk-adjusted, cost of capital. No asset impairment charges were recorded during the three and nine months ended September 30, 2021 or the three months ended September 30, 2020. The Company has identified certain assets with an aggregate carrying value of approximately $1.1 billion at September 30, 2021 in its Seaborne Metallurgical Mining, Powder River Basin Mining, Other U.S. Thermal Mining and Corporate and Other segments whose recoverability is most sensitive to coal pricing, cost pressures, customer demand, customer concentration risk and future economic viability. The Company conducted a review of those assets as of September 30, 2021 and determined that no impairment charges were necessary as of that date.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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