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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories as of December 31, 2019 and December 31, 2018 consisted of the following:
 
December 31,
 
2019
 
2018
 
(Dollars in millions)
Materials and supplies
$
116.3

 
$
118.1

Raw coal
85.1

 
53.6

Saleable coal
130.1

 
108.5

Inventories
$
331.5

 
$
280.2