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Property, Plant, Equipment and Mine Development (Tables)
6 Months Ended
Jun. 30, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
The composition of property, plant, equipment and mine development, net, as of June 30, 2020 and December 31, 2019 is set forth in the table below:
June 30, 2020December 31, 2019
(Dollars in millions)
Land and coal interests$2,577.8  $4,022.4  
Buildings and improvements459.3  547.9  
Machinery and equipment1,330.6  1,518.6  
Less: Accumulated depreciation, depletion and amortization(1,189.3) (1,409.8) 
Property, plant, equipment and mine development, net$3,178.4  $4,679.1