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Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2025

Revenue Recognition [Abstract]

Schedule of Accounts Receivable

“Accounts receivable, net” at March 31, 2025 and December 31, 2024 consisted of the following:

			March 31, 2025						December 31, 2024
			(Dollars in millions)
Trade receivables, net			$	220.4					$	294.9
Miscellaneous receivables, net			57.3						64.4
Accounts receivable, net			$	277.7					$	359.3

Disaggregation of Revenue

With respect to its seaborne reportable segments, the Company classifies as “Export” certain revenue from domestically-delivered coal under contracts in which the price is derived on a basis similar to export contracts.

			Three Months Ended March 31, 2025
			Seaborne Thermal						Seaborne Metallurgical						Powder River Basin						Other U.S. Thermal						Corporate and Other (1)						Consolidated
			(Dollars in millions)
Thermal coal
Domestic			$	37.7					$	—					$	275.5					$	168.7					$	—					$	481.9
Export			227.3						—						—						—						—						227.3
Total thermal			265.0						—						275.5						168.7						—						709.2
Metallurgical coal
Export			—						219.7						—						—						—						219.7
Total metallurgical			—						219.7						—						—						—						219.7
Other			0.1						0.4						0.1						—						7.5						8.1
Revenue			$	265.1					$	220.1					$	275.6					$	168.7					$	7.5					$	937.0

			Three Months Ended March 31, 2024
			Seaborne Thermal						Seaborne Metallurgical						Powder River Basin						Other U.S. Thermal						Corporate and Other (1)						Consolidated
			(Dollars in millions)
Thermal coal
Domestic			$	40.6					$	—					$	254.1					$	178.0					$	—					$	472.7
Export			243.1						—						—						—						—						243.1
Total thermal			283.7						—						254.1						178.0						—						715.8
Metallurgical coal
Export			—						244.0						—						—						—						244.0
Total metallurgical			—						244.0						—						—						—						244.0
Other			0.2						3.0						—						13.6						7.0						23.8
Revenue			$	283.9					$	247.0					$	254.1					$	191.6					$	7.0					$	983.6

(1)    Corporate and Other includes the following:

									Three Months Ended March 31,
															2025						2024
															(Dollars in millions)
Revenue from physical sale of coal (2)															$	4.0					$	2.1
Other															3.5						4.9
Total Corporate and Other															$	7.5					$	7.0

(2)    Includes revenue recognized upon the physical sale of coal purchased from the Company’s operating segments and sold to customers through the Company’s coal trading business. Primarily represents the difference between the price contracted with the customer and the price allocated to the operating segment.

X

- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

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No definition available.

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- Definition

Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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