Property, Plant, Equipment and Mine Development (Tables)

6 Months Ended

Jun. 30, 2022

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 June 30, 2022 and December 31, 2021 is set forth in the table below:

	June 30, 2022		December 31, 2021
	(Dollars in millions)
Land and coal interests	$	2,488.8	$	2,494.1
Buildings and improvements	593.2		550.8
Machinery and equipment	1,400.4		1,386.2
Less: Accumulated depreciation, depletion and amortization	(1,625.8)		(1,480.5)
Property, plant, equipment and mine development, net	$	2,856.6	$	2,950.6