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Property, Plant, Equipment and Mine Development (Tables)
 9 Months Ended
Sep. 30, 2016
Property, Plant, Equipment and Mine Development, Net [Line Items]  
Property, Plant and Equipment [Table Text Block]
Property, plant, equipment and mine development, net, as of September 30, 2016 and December 31, 2015 consisted of the following:
 
September 30, 2016
 
December 31, 2015
 
(Dollars in millions)
Land and coal interests
$
10,756.7

 
$
10,503.7

Buildings and improvements
1,533.0

 
1,506.0

Machinery and equipment
2,272.5

 
2,280.4

Less: Accumulated depreciation, depletion and amortization
(5,346.7
)
 
(5,031.6
)
Total, net
$
9,215.5

 
$
9,258.5