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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories as of December 31, 2018 and December 31, 2017 consisted of the following:
 
December 31, 2018
 
December 31, 2017
 
(Dollars in millions)
Materials and supplies
$
118.1

 
$
101.5

Raw coal
53.6

 
78.1

Saleable coal
108.5

 
111.7

Inventories
$
280.2

 
$
291.3