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Property, Plant, and Equipment
 9 Months Ended
Sep. 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):

 

 

 

September 30,

 

 

December 31,

 

 

 

2017

 

 

2016

 

Land and land improvements

 

$

156.1

 

 

$

149.7

 

Buildings

 

 

731.2

 

 

 

717.1

 

Machinery and equipment

 

 

5,066.2

 

 

 

4,951.4

 

Construction in progress

 

 

177.6

 

 

 

125.4

 

Other

 

 

66.5

 

 

 

66.7

 

Property, plant and equipment, at cost

 

 

6,197.6

 

 

 

6,010.3

 

Less accumulated depreciation

 

 

(3,316.0

)

 

 

(3,114.6

)

Property, plant, and equipment, net

 

$

2,881.6

 

 

$

2,895.7

 

 

Depreciation expense for the three months ended September 30, 2017 and 2016 was $87.0 million and $79.9 million, respectively. During the nine months ended September 30, 2017 and 2016, depreciation expense was $253.0 million and $240.5 million, respectively. During the nine months ended September 30, 2017, we recognized $2.6 million incremental depreciation expense from shortening the useful lives of certain assets related to the Wallula mill restructuring.

At September 30, 2017 and December 31, 2016 purchases of property, plant, and equipment included in accounts payable were $30.4 million and $12.8 million, respectively.