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Property, Plant, and Equipment
 6 Months Ended
Jun. 30, 2018
Property Plant And Equipment [Abstract]  
Property, Plant, and Equipment

9.

Property, Plant, and Equipment

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

 

 

 

June 30,

 

 

December 31,

 

 

 

2018

 

 

2017

 

Land and land improvements

 

$

159.7

 

 

$

156.0

 

Buildings

 

 

735.8

 

 

 

729.8

 

Machinery and equipment

 

 

5,364.0

 

 

 

5,162.5

 

Construction in progress

 

 

209.8

 

 

 

194.5

 

Other

 

 

71.6

 

 

 

68.4

 

Property, plant and equipment, at cost

 

 

6,540.9

 

 

 

6,311.2

 

Less accumulated depreciation

 

 

(3,514.4

)

 

 

(3,386.3

)

Property, plant, and equipment, net

 

$

3,026.5

 

 

$

2,924.9

 

 

Depreciation expense for the three months ended June 30, 2018 and 2017 was $91.6 million and $83.6 million, respectively. During the six months ended June 30, 2018 and 2017, depreciation expense was $186.2 million and $166.0 million, respectively. We recognized $13.5 million of incremental depreciation expense during the six months ended June 30, 2018 as a result of shortening the useful lives of certain assets related to the Wallula mill restructuring and a corporate administration facility.

At June 30, 2018 and December 31, 2017, purchases of property, plant, and equipment included in accounts payable were $47.6 million and $29.8 million, respectively.