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Property, Plant, and Equipment (Tables)
 9 Months Ended
Sep. 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):
 
September 30,
2016
 
December 31,
2015
Land and land improvements
$
148.6

 
$
146.4

Buildings
687.8

 
640.9

Machinery and equipment
4,902.2

 
4,747.1

Construction in progress
151.2

 
119.1

Other
62.6

 
61.3

Property, plant, and equipment, at cost
5,952.4

 
5,714.8

Less accumulated depreciation
(3,073.7
)
 
(2,882.7
)
Property, plant, and equipment, net
$
2,878.7

 
$
2,832.1