XML 41 R29.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Property, Plant, Equipment and Mine Development (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2022
Property, Plant and Equipment [Abstract] |
Schedule of 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 |

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 Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_PropertyPlantAndEquipmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration