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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Property, Plant and Equipment

estimated useful lives of the building and improvements and machinery and equipment asset categories range from 1 to 31 years. The estimated life of leasehold improvements is the shorter of useful life or remaining life of the lease.

Property, plant, equipment and mine development, net, as of December 31, 2025 and 2024 consisted of the following:

			December 31,
			2025						2024
			(Dollars in millions)
Land and coal interests			$	2,691.2					$	2,648.5
Buildings and improvements			758.8						726.7
Machinery and equipment			2,377.1						2,078.8
Less: Accumulated depreciation, depletion and amortization			(2,673.8)						(2,372.5)
Property, plant, equipment and mine development, net			$	3,153.3					$	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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