Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2024

Accounting Policies [Abstract]

Summary of Components of Inventories

The components of inventories were as follows (dollars in millions):

	December 31,
	2024		2023
Raw materials	$	356.6	$	326.2
Work in process		15.5		14.9
Finished goods		234.0		200.5
Supplies and materials		518.8		471.5
Inventories	$	1,124.9	$	1,013.1

Summary of Property, Plant and Equipment (at cost)

Property, plant, and equipment consisted of the following (dollars in millions):

	December 31,
	2024			2023
Land and land improvements	$	203.4		$	197.8
Buildings		1,140.0			1,090.4
Machinery and equipment		7,368.8			7,006.7
Construction in progress		397.2			335.8
Other		195.8			177.0
Property, plant and equipment, at cost		9,305.2			8,807.7
Less accumulated depreciation		(5,266.2	)		(4,943.9	)
Property, plant, and equipment, net	$	4,039.0		$	3,863.8

Summary of Property, Plant and Equipment Estimated Useful Lives

The following lives are used for the various categories of assets:

Buildings and land improvements	5 to 40 years
Machinery and equipment	3 to 25 years
Trucks and automobiles	3 to 20 years
Furniture and fixtures	3 to 25 years
Computers and hardware	3 to 10 years
Leasehold improvements	Period of the lease or useful life, if shorter