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Inventories (Tables)
6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories as of June 30, 2017 and December 31, 2016 consisted of the following:
 
Successor
Predecessor
 
June 30, 2017
December 31, 2016
 
(Dollars in millions)
Materials and supplies
$
105.0

$
104.5

Raw coal
55.3

29.6

Saleable coal
153.2

69.6

Total
$
313.5

$
203.7