Property, Plant, and Equipment

3 Months Ended

Mar. 31, 2022

Property, Plant and Equipment [Abstract]

9. Property, Plant, and Equipment

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


	March 31,			December 31,
	2022			2021
Land and land improvements	$	192.9		$	189.8
Buildings		949.1			938.7
Machinery and equipment		6,248.6			6,159.1
Construction in progress		581.4			481.0
Other		121.7			102.9
Property, plant and equipment, at cost		8,093.7			7,871.5
Less accumulated depreciation		(4,423.0	)		(4,342.5	)
Property, plant, and equipment, net	$	3,670.7		$	3,529.0

Depreciation expense for the three months ended March 31, 2022 and 2021 was $98.5 million and $90.0 million, respectively. We recognized $1.1 million and $0.5 million of incremental depreciation expense during the three months ended March 31, 2022 and 2021, respectively, as a result of the Jackson mill conversion-related activities.

At March 31, 2022 and December 31, 2021, purchases of property, plant, and equipment included in accounts payable were $103.1 million and $73.6 million, respectively.