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Property, Plant, and Equipment
 6 Months Ended
Jun. 30, 2017
Property Plant And Equipment [Abstract]  
Property, Plant, and Equipment

7.

Property, Plant, and Equipment

The components of property, plant, and equipment were as follows (dollars in millions):

 

 

 

June 30,

 

 

December 31,

 

 

 

2017

 

 

2016

 

Land and land improvements

 

$

156.3

 

 

$

149.7

 

Buildings

 

 

725.7

 

 

 

717.1

 

Machinery and equipment

 

 

5,017.9

 

 

 

4,951.4

 

Construction in progress

 

 

152.6

 

 

 

125.4

 

Other

 

 

67.5

 

 

 

66.7

 

Property, plant and equipment, at cost

 

 

6,120.0

 

 

 

6,010.3

 

Less accumulated depreciation

 

 

(3,247.5

)

 

 

(3,114.6

)

Property, plant, and equipment, net

 

$

2,872.5

 

 

$

2,895.7

 

 

Depreciation expense for the three months ended June 30, 2017 and 2016 was $83.6 million and $79.9 million, respectively. During the six months ended June 30, 2017 and 2016, depreciation expense was $166.0 million and $160.6 million, respectively. 

At June 30, 2017 and December 31, 2016 purchases of property, plant, and equipment included in accounts payable were $19.0 million and $12.8 million, respectively.