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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories as of June 30, 2019 and December 31, 2018 consisted of the following:
 
June 30, 2019
 
December 31, 2018
 
(Dollars in millions)
Materials and supplies
$
123.8

 
$
118.1

Raw coal
74.9

 
53.6

Saleable coal
123.4

 
108.5

Total
$
322.1

 
$
280.2