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Property, Plant, Equipment and Mine Development (Tables)
 12 Months Ended
Dec. 31, 2014
Property, Plant, Equipment and Mine Development [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property, plant, equipment and mine development, net, as of December 31, 2014 and December 31, 2013 consisted of the following:
 
December 31,
 
2014
 
2013
 
(Dollars in millions)
Land and coal interests
$
11,021.1

 
$
11,024.1

Buildings and improvements
1,569.1

 
1,525.4

Machinery and equipment
2,685.7

 
2,777.5

Less: Accumulated depreciation, depletion and amortization
(4,698.6
)
 
(4,244.5
)
Total, net
$
10,577.3

 
$
11,082.5