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Property, Plant, Equipment and Mine Development (Tables)

9 Months Ended

Sep. 30, 2025

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, 2025 and December 31, 2024 is set forth in the table below:

			September 30, 2025						December 31, 2024
			(Dollars in millions)
Land and coal interests			$	2,645.1					$	2,648.5
Buildings and improvements			754.1						726.7
Machinery and equipment			2,295.7						2,078.8
Less: Accumulated depreciation, depletion and amortization			(2,619.4)						(2,372.5)
Property, plant, equipment and mine development, net			$	3,075.5					$	3,081.5

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- References

No definition available.

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- 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
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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