Property, Plant, Equipment and Mine Development (Tables)

3 Months Ended

Mar. 31, 2016

Property, Plant, Equipment and Mine Development, Net [Line Items]

Property, Plant and Equipment [Table Text Block]

Property, plant, equipment and mine development, net, as of March 31, 2016 and December 31, 2015 consisted of the following:

	March 31, 2016			December 31, 2015
	(Dollars in millions)
Land and coal interests	$	10,507.2		$	10,503.7
Buildings and improvements	1,533.0			1,506.0
Machinery and equipment	2,263.0			2,280.4
Less: Accumulated depreciation, depletion and amortization	(5,140.4		)	(5,031.6		)
Total, net	$	9,162.8		$	9,258.5