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Property, Plant, Equipment and Mine Development
 6 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant, Equipment and Mine Development Property, Plant, Equipment and Mine Development
The composition of property, plant, equipment and mine development, net, as of June 30, 2019 and December 31, 2018 is set forth in the table below:
 
June 30, 2019
 
December 31, 2018
 
(Dollars in millions)
Land and coal interests
$
4,164.3

 
$
4,148.8

Buildings and improvements
549.1

 
559.3

Machinery and equipment
1,528.7

 
1,456.3

Less: Accumulated depreciation, depletion and amortization
(1,267.3
)
 
(957.4
)
Property, plant, equipment and mine development, net
$
4,974.8

 
$
5,207.0