XML 29 R16.htm IDEA: XBRL DOCUMENT
v3.24.3

Property, Plant, Equipment and Mine Development | 9 Months Ended
--- | ---
Sep. 30, 2024
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, 2024 and December 31, 2023 is set forth in the table below:
| September 30, 2024 |  | December 31, 2023
| (Dollars in millions)
Land and coal interests | $ | 2,624.4 |  |  | $ | 2,475.2 |
Buildings and improvements | 658.1 |  |  | 647.6 |
Machinery and equipment | 2,021.4 |  |  | 1,787.6 |
Less: Accumulated depreciation, depletion and amortization | (2,290.4) |  |  | (2,066.3) |
Property, plant, equipment and mine development, net | $ | 3,013.5 |  |  | $ | 2,844.1 |
At-Risk Assets The Company identified certain assets with an aggregate carrying value of approximately $207 million at September 30, 2024 in its Other U.S. Thermal segment whose recoverability is most sensitive to customer concentration risk.

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://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
Name: | us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration