Restructuring and Other (Income) Charges, net - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended	24 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2025	Nov. 01, 2023
Restructuring Cost and Reserve [Line Items]
Expected revenue impact of strategic segment changes								45.00%
Workforce reduction						23.00%
Payments for restructuring			$ 23,100,000
Inventory write-down		$ 0		$ 2,500,000
Loss on CTO resales	$ 0	(23,500,000)	0	(50,000,000.0)
CTO supply contract termination charges					$ 100,000,000.0
Restructuring, Severance and Other Employee Related Costs
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			4,700,000
Other Restructuring | North Charleston plant transition
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 3,100,000		$ 3,600,000
Performance Chemicals
Restructuring Cost and Reserve [Line Items]
Workforce reduction						40.00%
Restructuring costs			335,100,000
Restructuring charges, non-cash			248,000,000.0
Restructuring costs, to be settled in cash			87,100,000
Payments for restructuring			71,100,000
Performance Chemicals | Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring charges, cash, expected							$ 110,000,000
Performance Chemicals | Forecast | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring charges, cash, expected							10,000,000
Performance Chemicals | Forecast | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring charges, cash, expected							$ 15,000,000
Performance Chemicals | Multiple Restructuring Changes
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	365,000,000		365,000,000
Performance Chemicals | Restructuring, Asset Related
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	255,000,000		255,000,000
Performance Chemicals | Restructuring, Severance and Other Employee Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	25,000,000		25,000,000
Performance Chemicals | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	$ 85,000,000		$ 85,000,000