Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2021

Revenue Recognition [Abstract]

Disaggregation of Revenue by Product Type and Market

With respect to its seaborne mining 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 June 30, 2021
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Other U.S. Thermal Mining		Corporate and Other (1)		Consolidated
	(Dollars in millions)
Thermal coal
Domestic	$	47.5	$	—	$	248.8	$	160.0	$	—	$	456.3
Export	146.4		—		—		1.2		—		147.6
Total thermal	193.9		—		248.8		161.2		—		603.9
Metallurgical coal
Export	—		120.4		—		—		—		120.4
Total metallurgical	—		120.4		—		—		—		120.4
Other (2)	0.2		0.6		(0.2)		0.9		(2.4)		(0.9)
Revenues	$	194.1	$	121.0	$	248.6	$	162.1	$	(2.4)	$	723.4

	Three Months Ended June 30, 2020
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Other U.S. Thermal Mining		Corporate and Other (1)		Consolidated
	(Dollars in millions)
Thermal coal
Domestic	$	38.3	$	—	$	205.8	$	144.1	$	—	$	388.2
Export	123.5		—		—		—		—		123.5
Total thermal	161.8		—		205.8		144.1		—		511.7
Metallurgical coal
Export	—		91.4		—		—		—		91.4
Total metallurgical	—		91.4		—		—		—		91.4
Other (2)	0.2		0.2		—		7.9		15.3		23.6
Revenues	$	162.0	$	91.6	$	205.8	$	152.0	$	15.3	$	626.7

	Six Months Ended June 30, 2021
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Other U.S. Thermal Mining		Corporate and Other (1)		Consolidated
	(Dollars in millions)
Thermal coal
Domestic	$	91.6	$	—	$	477.2	$	306.8	$	—	$	875.6
Export	278.3		—		—		1.2		—		279.5
Total thermal	369.9		—		477.2		308.0		—		1,155.1
Metallurgical coal
Domestic	—		2.7		—		—		—		2.7
Export	—		204.3		—		—		—		204.3
Total metallurgical	—		207.0		—		—		—		207.0
Other (2)	0.6		1.5		(0.2)		3.4		7.3		12.6
Revenues	$	370.5	$	208.5	$	477.0	$	311.4	$	7.3	$	1,374.7

	Six Months Ended June 30, 2020
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Other U.S. Thermal Mining		Corporate and Other (1)		Consolidated
	(Dollars in millions)
Thermal coal
Domestic	$	74.8	$	—	$	472.4	$	328.7	$	—	$	875.9
Export	287.2		—		—		—		—		287.2
Total thermal	362.0		—		472.4		328.7		—		1,163.1
Metallurgical coal
Export	—		283.9		—		—		—		283.9
Total metallurgical	—		283.9		—		—		—		283.9
Other (2)	1.1		0.9		—		15.6		8.3		25.9
Revenues	$	363.1	$	284.8	$	472.4	$	344.3	$	8.3	$	1,472.9

(1)    Corporate and Other revenue includes gains and losses related to mark-to-market adjustments from economic hedge activities intended to hedge future coal sales. Refer to Note 7. “Derivatives and Fair Value Measurements” for additional information regarding the economic hedge activities.

(2)    Other includes revenues from arrangements such as customer contract-related payments associated with volume shortfalls, royalties related to coal lease agreements, sales agency commissions, farm income and property and facility rentals.

Schedule of Accounts Receivable

“Accounts receivable, net” at June 30, 2021 and December 31, 2020 consisted of the following:

	June 30, 2021		December 31, 2020
	(Dollars in millions)
Trade receivables, net	$	217.3	$	180.9
Miscellaneous receivables, net	33.4		63.9
Accounts receivable, net	$	250.7	$	244.8