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Inventories (Tables)
 12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Components of inventories
These components of inventories were as follows:
 
December 31,
 
2015
 
2014
 
(Dollars in millions)
Coal
$
76.8

 
$
100.9

Coke
8.8

 
6.9

Materials, supplies and other
36.5

 
34.4

Total inventories
$
122.1

 
$
142.2