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Property, Plant, Equipment and Mine Development (Notes)
6 Months Ended
Jun. 30, 2014
Property, Plant, Equipment and Mine Development [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
Property, Plant, Equipment and Mine Development
Property, plant, equipment and mine development, net, as of June 30, 2014 and December 31, 2013 consisted of the following:
 
June 30, 2014
 
December 31, 2013
 
(Dollars in millions)
Land and coal interests
$
10,957.6

 
$
11,024.1

Buildings and improvements
1,553.2

 
1,525.4

Machinery and equipment
2,663.3

 
2,777.5

Less: Accumulated depreciation, depletion and amortization
(4,473.6
)
 
(4,244.5
)
Total, net
$
10,700.5

 
$
11,082.5