Property, Plant, Equipment and Mine Development

12 Months Ended

Dec. 31, 2019

Property, Plant, Equipment and Mine Development [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

Property, Plant, Equipment and Mine Development

Property, plant, equipment and mine development, net, as of December 31, 2019 and December 31, 2018 consisted of the following:

	December 31,
	2019			2018
	(Dollars in millions)
Land and coal interests	$	4,022.4		$	4,148.8
Buildings and improvements	547.9			559.3
Machinery and equipment	1,518.6			1,456.3
Less: Accumulated depreciation, depletion and amortization	(1,409.8		)	(957.4		)
Property, plant, equipment and mine development, net	$	4,679.1		$	5,207.0

Land and coal interests included coal reserves with a net book value of $2.8 billion as of December 31, 2019 and $3.0 billion as of December 31, 2018. Such coal reserves were comprised of mineral rights for leased coal interests and advance royalties that had a net book value of $2.0 billion and $2.1 billion as of December 31, 2019 and 2018, respectively, and coal reserves held by fee ownership of $0.8 billion and $0.9 billion at December 31, 2019 and 2018, respectively. The amount of coal reserves not subject to current depletion at properties where the Company was not currently engaged in mining operations or leasing to third parties was $0.1 billion and $0.2 billion as of December 31, 2019 and 2018, respectively.

Land and coal interests also include acquired interests in mineral rights at certain Australian exploration properties that had a net book value of $0.1 billion as of December 31, 2019 and 2018.