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Customer Concentrations (Tables)
 12 Months Ended
Dec. 31, 2015
Risks and Uncertainties [Abstract]  
Schedules of Concentration of Risk, by Risk Factor
The table below shows sales to the Company's significant customers for the years ended December 31, 2015, 2014 and 2013 (dollars in millions):
 
 
Years ended December 31,
 
 
2015
 
2014
 
2013
 
 
Sales and other operating revenue
 
Percent of Company sales and other operating revenue
 
Sales and other operating revenue
 
Percent of Company sales and other operating revenue
 
Sales and other operating revenue
 
Percent of Company sales and other operating revenue
 
 
(Dollars in millions)
ArcelorMittal(1)
 
$
662.3

 
49.0
%
 
$
771.9

 
51.8
%
 
$
826.7

 
50.6
%
AK Steel(1)
 
$
395.4

 
29.3
%
 
$
402.4

 
27.0
%
 
$
489.7

 
30.0
%
U.S. Steel(2)
 
$
212.7

 
15.7
%
 
$
249.2

 
16.7
%
 
$
276.6

 
16.9
%
(1) Represents revenues recorded in our Domestic Coke segment.
(2) Represents revenues recorded in our Domestic Coke and Coal Logistics segments.