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Property, Plant, Equipment and Mine Development (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant, Equipment and Mine Development [Abstract]  
Property, Plant and Equipment [Table Text Block]
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