XML 27 R35.htm IDEA: XBRL DOCUMENT v3.20.1
Property, Plant, Equipment and Mine Development (Tables)
3 Months Ended
Mar. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
The composition of property, plant, equipment and mine development, net, as of March 31, 2020 and December 31, 2019 is set forth in the table below:
 
March 31, 2020
 
December 31, 2019
 
(Dollars in millions)
Land and coal interests
$
4,025.4

 
$
4,022.4

Buildings and improvements
557.6

 
547.9

Machinery and equipment
1,534.4

 
1,518.6

Less: Accumulated depreciation, depletion and amortization
(1,509.6
)
 
(1,409.8
)
Property, plant, equipment and mine development, net
$
4,607.8

 
$
4,679.1