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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Inventories
Inventories as of March 31, 2020 and December 31, 2019 consisted of the following:
 
March 31, 2020
 
December 31, 2019
 
(Dollars in millions)
Materials and supplies
$
113.7

 
$
116.3

Raw coal
59.1

 
85.1

Saleable coal
96.4

 
130.1

Total
$
269.2

 
$
331.5