XML 28 R16.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Property, Plant, Equipment and Mine Development | 9 Months Ended
--- | ---
Sep. 30, 2022
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, 2022 and December 31, 2021 is set forth in the table below:
| September 30, 2022 |  | December 31, 2021
| (Dollars in millions)
Land and coal interests | $ | 2,487.3 |  |  | $ | 2,494.1 |
Buildings and improvements | 596.1 |  |  | 550.8 |
Machinery and equipment | 1,440.0 |  |  | 1,386.2 |
Less: Accumulated depreciation, depletion and amortization | (1,705.8) |  |  | (1,480.5) |
Property, plant, equipment and mine development, net | $ | 2,817.6 |  |  | $ | 2,950.6 |
Asset Impairment and Other At-Risk Assets The Company has identified certain assets with an aggregate carrying value of $209.2 million at September 30, 2022 in its Other U.S. Thermal Mining segment whose recoverability is most sensitive to customer demand, customer concentration risk and future economic viability. The Company conducted a review of those assets as of September 30, 2022 and determined that no impairment charges were necessary as of that date.

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration