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Property, Plant, Equipment and Mine Development (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 and December 31, 2016 consisted of the following:
 
Successor
Predecessor
 
December 31, 2017
December 31, 2016
 
(Dollars in millions)
Land and coal interests
$
3,890.5

$
10,330.8

Buildings and improvements
470.6

1,507.6

Machinery and equipment
1,149.3

2,130.2

Less: Accumulated depreciation, depletion and amortization
(398.5
)
(5,191.9
)
Property, plant, equipment and mine development, net
$
5,111.9

$
8,776.7