The Company accounts for revenue in accordance with ASC Topic 606, “Revenue from Contracts with Customers” (ASC 606), which the Company adopted on January 1, 2018, using the modified retrospective approach. Refer to Note 1. “Summary of Significant Accounting Policies” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018, for the Company’s policies regarding “Revenues” and “Accounts receivable, net.”

Revenue by product type and market is set forth in the following tables. 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, 2019
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Midwestern U.S. Mining		Western U.S. Mining		Corporate and Other ⁽¹⁾			Consolidated
	(Dollars in millions)
Thermal coal
Domestic	$	34.8	$	—	$	333.6	$	175.8	$	143.6	$	—		$	687.8
Export	214.6		—		—		—		—		—			214.6
Total thermal	249.4		—		333.6		175.8		143.6		—			902.4
Metallurgical coal
Export	—		215.4		—		—		—		—			215.4
Total metallurgical	—		215.4		—		—		—		—			215.4
Other	0.1		0.9		—		0.2		6.8		(19.4		)	(11.4		)
Revenues	$	249.5	$	216.3	$	333.6	$	176.0	$	150.4	$	(19.4	)	$	1,106.4



	Three Months Ended September 30, 2018
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Midwestern U.S. Mining		Western U.S. Mining		Corporate and Other ⁽¹⁾			Consolidated
	(Dollars in millions)
Thermal coal
Domestic	$	37.4	$	—	$	373.7	$	208.4	$	149.5	$	—		$	769.0
Export	267.7		—		—		—		3.1		—			270.8
Total thermal	305.1		—		373.7		208.4		152.6		—			1,039.8
Metallurgical coal
Export	—		369.4		—		—		—		—			369.4
Total metallurgical	—		369.4		—		—		—		—			369.4
Other	—		0.9		—		0.1		3.5		(1.1		)	3.4
Revenues	$	305.1	$	370.3	$	373.7	$	208.5	$	156.1	$	(1.1	)	$	1,412.6



	Nine Months Ended September 30, 2019
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Midwestern U.S. Mining		Western U.S. Mining		Corporate and Other ⁽¹⁾		Consolidated
	(Dollars in millions)
Thermal coal
Domestic	$	110.9	$	—	$	903.4	$	522.3	$	417.0	$	—	$	1,953.6
Export	608.7		—		—		—		11.3		—		620.0
Total thermal	719.6		—		903.4		522.3		428.3		—		2,573.6
Metallurgical coal
Export	—		829.4		—		—		—		—		829.4
Total metallurgical	—		829.4		—		—		—		—		829.4
Other	1.1		2.3		0.1		0.3		19.9		79.3		103.0
Revenues	$	720.7	$	831.7	$	903.5	$	522.6	$	448.2	$	79.3	$	3,506.0



	Nine Months Ended September 30, 2018
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Midwestern U.S. Mining		Western U.S. Mining		Corporate and Other ⁽¹⁾		Consolidated
	(Dollars in millions)
Thermal coal
Domestic	$	112.0	$	—	$	1,084.4	$	606.2	$	410.9	$	—	$	2,213.5
Export	661.3		—		—		1.3		15.4		—		678.0
Total thermal	773.3		—		1,084.4		607.5		426.3		—		2,891.5
Metallurgical coal
Export	—		1,251.9		—		—		—		—		1,251.9
Total metallurgical	—		1,251.9		—		—		—		—		1,251.9
Other	0.6		2.1		0.1		0.2		13.1		25.2		41.3
Revenues	$	773.9	$	1,254.0	$	1,084.5	$	607.7	$	439.4	$	25.2	$	4,184.7



	Three Months Ended September 30, 2019
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Midwestern U.S. Mining		Western U.S. Mining		Corporate and Other ⁽¹⁾			Consolidated
	(Dollars in millions)
One year or longer	$	158.5	$	193.3	$	287.8	$	171.6	$	143.6	$	—		$	954.8
Less than one year	90.9		22.1		45.8		4.2		—		—			163.0
Other ⁽²⁾	0.1		0.9		—		0.2		6.8		(19.4		)	(11.4		)
Revenues	$	249.5	$	216.3	$	333.6	$	176.0	$	150.4	$	(19.4	)	$	1,106.4



	Three Months Ended September 30, 2018
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Midwestern U.S. Mining		Western U.S. Mining		Corporate and Other ⁽¹⁾			Consolidated
	(Dollars in millions)
One year or longer	$	235.3	$	199.5	$	330.2	$	205.3	$	146.6	$	—		$	1,116.9
Less than one year	69.8		169.9		43.5		3.1		6.0		—			292.3
Other ⁽²⁾	—		0.9		—		0.1		3.5		(1.1		)	3.4
Revenues	$	305.1	$	370.3	$	373.7	$	208.5	$	156.1	$	(1.1	)	$	1,412.6



	Nine Months Ended September 30, 2019
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Midwestern U.S. Mining		Western U.S. Mining		Corporate and Other ⁽¹⁾		Consolidated
	(Dollars in millions)
One year or longer	$	480.2	$	668.8	$	837.6	$	497.6	$	422.2	$	—	$	2,906.4
Less than one year	239.4		160.6		65.8		24.7		6.1		—		496.6
Other ⁽²⁾	1.1		2.3		0.1		0.3		19.9		79.3		103.0
Revenues	$	720.7	$	831.7	$	903.5	$	522.6	$	448.2	$	79.3	$	3,506.0



	Nine Months Ended September 30, 2018
	Seaborne Thermal Mining		Seaborne Metallurgical Mining		Powder River Basin Mining		Midwestern U.S. Mining		Western U.S. Mining		Corporate and Other ⁽¹⁾		Consolidated
	(Dollars in millions)
One year or longer	$	585.8	$	852.1	$	984.4	$	587.0	$	400.4	$	—	$	3,409.7
Less than one year	187.5		399.8		100.0		20.5		25.9		—		733.7
Other ⁽²⁾	0.6		2.1		0.1		0.2		13.1		25.2		41.3
Revenues	$	773.9	$	1,254.0	$	1,084.5	$	607.7	$	439.4	$	25.2	$	4,184.7

The Company expects to recognize revenue subsequent to September 30, 2019 of approximately $4.8 billion related to contracts with customers in which volumes and prices per ton were fixed or reasonably estimable at September 30, 2019. Approximately 46% of such amount is expected to be recognized over the next twelve months and the remainder thereafter. Actual revenue related to such contracts may differ materially for various reasons, including price adjustment features for coal quality and cost escalations, volume optionality provisions and potential force majeure events. This estimate of future revenue does not include any revenue related to contracts with variable prices per ton that cannot be reasonably estimated, such as the majority of seaborne metallurgical and seaborne thermal coal contracts where pricing is negotiated or settled quarterly or annually.



	September 30, 2019		December 31, 2018
	(Dollars in millions)
Trade receivables, net	$	257.1	$	345.5
Miscellaneous receivables, net	36.3		104.9
Accounts receivable, net	$	293.4	$	450.4

Trade receivables, net presented above have been shown net of reserves of $0.1 million as of December 31, 2018. Trade receivables, net included no reserves as of September 30, 2019. Miscellaneous receivables, net presented above have been shown net of reserves of $4.3 million as of both September 30, 2019 and December 31, 2018. Included in “Operating costs and expenses” in the unaudited condensed consolidated statements of operations were credits for doubtful trade receivables of $0.4 million for the three months ended September 30, 2018 and $0.1 million and $0.2 million for the nine months ended September 30, 2019 and 2018, respectively. No charges for doubtful trade receivables were recognized during the three months ended September 30, 2019.

The Company also records long-term customer receivables related to the reimbursement of certain post-mining costs which are included within “Investments and other assets” in the accompanying condensed consolidated balance sheets. The balance of such receivables was $12.1 million and $11.1 million as of September 30, 2019 and December 31, 2018, respectively. In connection with the adoption of ASC 606, the Company records a portion of the consideration received as “Interest income” in the accompanying unaudited condensed consolidated statements of operations, due to the embedded financing element within the related contract. Interest income related to these arrangements amounted to $2.7 million and $2.1 million during the three months ended September 30, 2019 and 2018, respectively, and $8.0 million and $6.3 million during the nine months ended September 30, 2019 and 2018, respectively.