Property, Plant, and Equipment (Tables)

12 Months Ended

Dec. 31, 2025

Property, Plant, and Equipment [Abstract]

Major Categories of Property, Plant, and Equipment and Accumulated Depreciation and Depletion

The major categories of property, plant, and equipment and accumulated depreciation and depletion are presented below:

	December 31,
(in millions of dollars)		2025			2024
Mineral rights and reserves	$	560.9		$	560.0
Land		48.9			43.0
Buildings		211.9			202.0
Machinery and equipment		1,272.9			1,236.4
Furniture and fixtures and other		155.2			144.5
Construction in progress		59.1			50.7
		2,308.9			2,236.6
Less: accumulated depreciation and depletion		(1,283.9	)		(1,246.9	)
Property, plant and equipment, net	$	1,025.0		$	989.7