Property, Plant, and Equipment

3 Months Ended

Mar. 31, 2020

Property Plant And Equipment [Abstract]

Property, Plant, and Equipment

8. Property, Plant, and Equipment

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

	March 31,			December 31,
	2020			2019
Land and land improvements	$	177.8		$	177.5
Buildings		844.7			837.4
Machinery and equipment		5,742.6			5,727.4
Construction in progress		205.8			174.0
Other		84.0			81.5
Property, plant and equipment, at cost		7,054.9			6,997.8
Less accumulated depreciation		(3,916.3	)		(3,846.1	)
Property, plant, and equipment, net	$	3,138.6		$	3,151.7

Depreciation expense for the three months ended March 31, 2020 and 2019 was $89.8 million and $85.2 million, respectively. We did not recognize any incremental depreciation expense during the three months ended March 31, 2020. We recognized $0.2 million of incremental depreciation expense during the three months ended March 31, 2019 as a result of shortening the useful lives of certain assets primarily related to the Wallula mill restructuring.

At March 31, 2020 and December 31, 2019, purchases of property, plant, and equipment included in accounts payable were $35.3 million and $26.8 million, respectively.