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Inventories
6 Months Ended
Jun. 30, 2014
Inventory Disclosure [Abstract]  
Inventories
4. Inventories
The components of inventories were as follows:
 
 
June 30, 2014
 
December 31, 2013
 
 
(Dollars in millions)
Coal
 
$
90.2

 
$
84.0

Coke
 
8.4

 
11.8

Materials, supplies and other
 
41.8

 
39.5

Total inventories
 
$
140.4

 
$
135.3