Property, Plant, Equipment and Mine Development (Tables)

9 Months Ended

Sep. 30, 2020

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant, Equipment and Mine Development

The composition of property, plant, equipment and mine development, net, as of September 30, 2020 and December 31, 2019 is set forth in the table below:

	September 30, 2020		December 31, 2019
	(Dollars in millions)
Land and coal interests	$	2,578.8	$	4,022.4
Buildings and improvements	463.0		547.9
Machinery and equipment	1,363.0		1,518.6
Less: Accumulated depreciation, depletion and amortization	(1,252.5)		(1,409.8)
Property, plant, equipment and mine development, net	$	3,152.3	$	4,679.1