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Property, Plant, and Equipment (Tables)
6 Months Ended
Jun. 30, 2016
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,
2016
 
December 31,
2015
Land and land improvements
$
147.8

 
$
146.4

Buildings
645.5

 
640.9

Machinery and equipment
4,800.0

 
4,747.1

Construction in progress
172.8

 
119.1

Other
63.7

 
61.3

Property, plant, and equipment, at cost
5,829.8

 
5,714.8

Less accumulated depreciation
(3,019.9
)
 
(2,882.7
)
Property, plant, and equipment, net
$
2,809.9

 
$
2,832.1