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Property, Plant and Equipment, net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment
Total cost	$ 1,615.8	$ 1,581.1
Less: accumulated depreciation	(956.9)	(818.9)
Property, plant and equipment, net	658.9	762.2
Depreciation	71.6	81.5	$ 70.9
Finance lease obligations	100.0	101.1
Performance Chemicals
Property, Plant and Equipment
Depreciation	92.6	46.3
Machinery and equipment
Property, Plant and Equipment
Total cost	1,296.4	1,244.6
Property, plant and equipment, net	20.3	22.7
Finance lease obligations	93.7	94.2
Buildings and leasehold improvements
Property, Plant and Equipment
Total cost	224.3	217.4
Property, plant and equipment, net	29.9	32.3
Finance lease obligations	39.2	39.2
Land and land improvements
Property, Plant and Equipment
Total cost	26.2	26.3
Construction in progress
Property, Plant and Equipment
Total cost	$ 68.9	$ 92.8

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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