XML 59 R46.htm IDEA: XBRL DOCUMENT v3.7.0.1
Inventories (Tables)
 12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories as of December 31, 2016 and December 31, 2015 consisted of the following:
 
December 31,
 
2016
 
2015
 
(Dollars in millions)
Materials and supplies
$
104.5

 
$
115.9

Raw coal
29.6

 
75.9

Saleable coal
69.6

 
116.0

Total
$
203.7

 
$
307.8