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Inventories (Tables)
6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories as of June 30, 2016 and December 31, 2015 consisted of the following:
 
June 30, 2016
 
December 31, 2015
 
(Dollars in millions)
Materials and supplies
$
110.9

 
$
115.9

Raw coal
72.2

 
75.9

Saleable coal
120.6

 
116.0

Total
$
303.7

 
$
307.8