Goodwill and Other Intangible Assets, net - Intangible Assets (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Finite-Lived Intangible Assets [Roll Forward]
Beginning balance, Gross Asset Value			$ 445,000,000.0
Retirements			1,800,000
Foreign currency translation			27,300,000
Ending balance, Gross Asset Value	$ 470,500,000		470,500,000
Beginning balance, Accumulated Amortization			(166,200,000)
Amortization	(7,700,000)	$ (7,500,000)	(15,200,000)	$ (39,100,000)
Retirements			900,000
Foreign currency translation			(10,900,000)
Ending balance, Accumulated Amortization	(191,400,000)		(191,400,000)
Other intangibles, net	279,100,000		279,100,000		$ 278,800,000
Restructuring and other (income) charges, net
Finite-Lived Intangible Assets [Roll Forward]
Amortization	0	$ 0	0	$ (22,100,000)
Performance Chemicals
Finite-Lived Intangible Assets [Roll Forward]
Other intangibles, net	97,000,000.0		97,000,000.0		$ 102,500,000
Customer contracts and relationships
Finite-Lived Intangible Assets [Roll Forward]
Beginning balance, Gross Asset Value			264,900,000
Retirements			0
Foreign currency translation			15,000,000.0
Ending balance, Gross Asset Value	279,900,000		279,900,000
Beginning balance, Accumulated Amortization			(88,400,000)
Amortization			(7,600,000)
Retirements			0
Foreign currency translation			(5,500,000)
Ending balance, Accumulated Amortization	(101,500,000)		(101,500,000)
Other intangibles, net	178,400,000		178,400,000
Brands
Finite-Lived Intangible Assets [Roll Forward]
Beginning balance, Gross Asset Value			91,400,000
Retirements			0
Foreign currency translation			6,300,000
Ending balance, Gross Asset Value	97,700,000		97,700,000
Beginning balance, Accumulated Amortization			(35,400,000)
Amortization			(2,800,000)
Retirements			0
Foreign currency translation			(2,100,000)
Ending balance, Accumulated Amortization	(40,300,000)		(40,300,000)
Other intangibles, net	57,400,000		57,400,000
Developed Technology
Finite-Lived Intangible Assets [Roll Forward]
Beginning balance, Gross Asset Value			88,700,000
Retirements			1,800,000
Foreign currency translation			6,000,000.0
Ending balance, Gross Asset Value	92,900,000		92,900,000
Beginning balance, Accumulated Amortization			(42,400,000)
Amortization			(4,800,000)
Retirements			900,000
Foreign currency translation			(3,300,000)
Ending balance, Accumulated Amortization	(49,600,000)		(49,600,000)
Other intangibles, net	$ 43,300,000		$ 43,300,000