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Property, Plant, and Equipment (Tables)
 6 Months Ended
Jun. 30, 2015
Property, Plant and Equipment [Abstract]  
Components of Property, Plant, and Equipment
The components of property, plant, and equipment were as follows (dollars in millions):
 
June 30,
2015
 
December 31,
2014
Land and land improvements
$
150.7

 
$
143.5

Buildings
659.5

 
654.6

Machinery and equipment
4,621.3

 
4,508.0

Construction in progress
144.7

 
154.8

Other
54.9

 
54.5

Property, plant, and equipment, at cost
5,631.1

 
5,515.4

Less accumulated depreciation
(2,778.4
)
 
(2,657.8
)
Property, plant, and equipment, net
$
2,852.7

 
$
2,857.6