Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2020

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 September 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	$	37.1	$	—	$	264.3	$	172.8	$	—	$	474.2
Export	125.7		—		—		—		—		125.7
Total thermal	162.8		—		264.3		172.8		—		599.9
Metallurgical coal
Export	—		78.4		—		—		—		78.4
Total metallurgical	—		78.4		—		—		—		78.4
Other	0.2		0.4		0.5		7.0		(15.4)		(7.3)
Revenues	$	163.0	$	78.8	$	264.8	$	179.8	$	(15.4)	$	671.0

	Three Months Ended September 30, 2019
	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	$	34.8	$	—	$	333.6	$	319.4	$	—	$	687.8
Export	214.6		—		—		—		—		214.6
Total thermal	249.4		—		333.6		319.4		—		902.4
Metallurgical coal
Export	—		215.4		—		—		—		215.4
Total metallurgical	—		215.4		—		—		—		215.4
Other	0.1		0.9		—		7.0		(19.4)		(11.4)
Revenues	$	249.5	$	216.3	$	333.6	$	326.4	$	(19.4)	$	1,106.4

	Nine Months Ended September 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	$	111.9	$	—	$	736.7	$	501.5	$	—	$	1,350.1
Export	412.9		—		—		—		—		412.9
Total thermal	524.8		—		736.7		501.5		—		1,763.0
Metallurgical coal
Export	—		362.3		—		—		—		362.3
Total metallurgical	—		362.3		—		—		—		362.3
Other	1.3		1.3		0.5		22.6		(7.1)		18.6
Revenues	$	526.1	$	363.6	$	737.2	$	524.1	$	(7.1)	$	2,143.9

	Nine Months Ended September 30, 2019
	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	$	110.9	$	—	$	903.4	$	939.3	$	—	$	1,953.6
Export	608.7		—		—		11.3		—		620.0
Total thermal	719.6		—		903.4		950.6		—		2,573.6
Metallurgical coal
Export	—		829.4		—		—		—		829.4
Total metallurgical	—		829.4		—		—		—		829.4
Other	1.1		2.3		0.1		20.2		79.3		103.0
Revenues	$	720.7	$	831.7	$	903.5	$	970.8	$	79.3	$	3,506.0

Disaggregation of Revenue by Contract Duration

Revenue by initial contract duration was as follows:

	Three Months Ended September 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)
One year or longer	$	93.6	$	65.2	$	257.4	$	171.3	$	—	$	587.5
Less than one year	69.2		13.2		6.9		1.5		—		90.8
Other (2)	0.2		0.4		0.5		7.0		(15.4)		(7.3)
Revenues	$	163.0	$	78.8	$	264.8	$	179.8	$	(15.4)	$	671.0

	Three Months Ended September 30, 2019
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Other U.S. Thermal Mining		Corporate and Other (1)		Consolidated
	(Dollars in millions)
One year or longer	$	158.5	$	193.3	$	287.8	$	315.2	$	—	$	954.8
Less than one year	90.9		22.1		45.8		4.2		—		163.0
Other (2)	0.1		0.9		—		7.0		(19.4)		(11.4)
Revenues	$	249.5	$	216.3	$	333.6	$	326.4	$	(19.4)	$	1,106.4

	Nine Months Ended September 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)
One year or longer	$	272.4	$	269.4	$	696.5	$	498.0	$	—	$	1,736.3
Less than one year	252.4		92.9		40.2		3.5		—		389.0
Other (2)	1.3		1.3		0.5		22.6		(7.1)		18.6
Revenues	$	526.1	$	363.6	$	737.2	$	524.1	$	(7.1)	$	2,143.9

	Nine Months Ended September 30, 2019
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Other U.S. Thermal Mining		Corporate and Other (1)		Consolidated
	(Dollars in millions)
One year or longer	$	480.2	$	668.8	$	837.6	$	919.8	$	—	$	2,906.4
Less than one year	239.4		160.6		65.8		30.8		—		496.6
Other (2)	1.1		2.3		0.1		20.2		79.3		103.0
Revenues	$	720.7	$	831.7	$	903.5	$	970.8	$	79.3	$	3,506.0

(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, for which contract duration is not meaningful.

Schedule of Accounts Receivable

“Accounts receivable, net” at September 30, 2020 and December 31, 2019 consisted of the following:

	September 30, 2020		December 31, 2019
	(Dollars in millions)
Trade receivables, net	$	143.4	$	283.1
Miscellaneous receivables, net	49.5		46.4
Accounts receivable, net	$	192.9	$	329.5