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Property, Plant, Equipment and Mine Development (Notes)
 9 Months Ended
Sep. 30, 2015
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 September 30, 2015 and December 31, 2014 consisted of the following:
 
September 30, 2015
 
December 31, 2014
 
(Dollars in millions)
Land and coal interests
$
10,637.5

 
$
11,021.1

Buildings and improvements
1,536.9

 
1,569.1

Machinery and equipment
2,341.9

 
2,685.7

Less: Accumulated depreciation, depletion and amortization
(5,040.9
)
 
(4,698.6
)
Total, net
$
9,475.4

 
$
10,577.3