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Property, Plant, and Equipment
3 Months Ended
Mar. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment
Property, Plant, and Equipment

The components of property, plant, and equipment were as follows (dollars in millions):
 
March 31,
2017
 
December 31,
2016
Land and land improvements
$
154.1

 
$
149.7

Buildings
723.7

 
717.1

Machinery and equipment
4,987.7

 
4,951.4

Construction in progress
133.3

 
125.4

Other
66.2

 
66.7

Property, plant, and equipment, at cost
6,065.0

 
6,010.3

Less accumulated depreciation
(3,177.8
)
 
(3,114.6
)
Property, plant, and equipment, net
$
2,887.2

 
$
2,895.7



Depreciation expense for the three months ended March 31, 2017 and 2016 was $82.4 million and $80.7 million, respectively. During the three months ended March 31, 2016, we recognized $0.1 million of incremental depreciation expense from shortening the useful lives of assets related to facilities closures.

At March 31, 2017 and December 31, 2016 purchases of property, plant, and equipment included in accounts payable were $30.4 million and $12.8 million, respectively.