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Restructuring Charges and Asset Write-Offs - Restructuring Related Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		21 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Mar. 31, 2026	Dec. 31, 2025
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	$ 7,337		$ 33,203
Decommissioning Costs
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	7,688		13,221
Asset Write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	(406)		2,326
Severance and Employee Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	0		15,397
Contract Cancellation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	0		1,013
Other
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	55		1,246
Kemerton Train 1 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	7,125		31,801
Restructuring Reserve	10,590		10,590			$ 0
Charges			32,207
Restructuring Reserve, Accrual Adjustment			(406)
Cash payments			(18,692)
Asset write-off			(2,326)
Foreign currency translation adjustments and other			(193)
Kemerton Train 1 Restructuring \| Decommissioning Costs
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	7,476		11,819
Restructuring Reserve	0		0			0
Charges			11,819
Restructuring Reserve, Accrual Adjustment			0
Cash payments			(11,819)
Asset write-off			0
Foreign currency translation adjustments and other			0
Kemerton Train 1 Restructuring \| Asset Write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	(406)		2,326
Restructuring Reserve	0		0			0
Charges			2,732
Restructuring Reserve, Accrual Adjustment			(406)
Cash payments			0
Asset write-off			(2,326)
Foreign currency translation adjustments and other			0
Kemerton Train 1 Restructuring \| Severance and Employee Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	0		15,397
Restructuring Reserve	8,804		8,804			0
Charges			15,397
Restructuring Reserve, Accrual Adjustment			0
Cash payments			(6,400)
Asset write-off			0
Foreign currency translation adjustments and other			(193)
Kemerton Train 1 Restructuring \| Contract Cancellation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	0		1,013
Restructuring Reserve	747		747			0
Charges			1,013
Restructuring Reserve, Accrual Adjustment			0
Cash payments			(266)
Asset write-off			0
Foreign currency translation adjustments and other			0
Kemerton Train 1 Restructuring \| Other
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	55		1,246
Restructuring Reserve	1,039		1,039			0
Charges			1,246
Restructuring Reserve, Accrual Adjustment			0
Cash payments			(207)
Asset write-off			0
Foreign currency translation adjustments and other			0
Second Half 2024 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	212	$ 4,284	1,402	$ 3,451
Restructuring Reserve	15,374		15,374			22,116
Charges			1,402
Cash payments			(7,420)
Foreign currency translation adjustments and other			(724)
Second Half 2024 Restructuring \| Decommissioning Costs
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	212	1,430	1,402	7,185
Restructuring Reserve	0		0			0
Charges			1,402		$ 13,200
Cash payments			(1,402)
Foreign currency translation adjustments and other			0
Second Half 2024 Restructuring \| Asset Write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	0	370	0	(6,878)
Restructuring Reserve	0		0			0
Charges			0		726,000
Cash payments			0
Foreign currency translation adjustments and other			0
Second Half 2024 Restructuring \| Severance and Employee Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	0	564	0	2,184
Restructuring Reserve	0		0			1,115
Charges			0		53,400
Cash payments			(837)
Foreign currency translation adjustments and other			(278)
Second Half 2024 Restructuring \| Contract Cancellation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	0	2,603	0	777
Restructuring Reserve	10,531		10,531			16,158
Charges			0		38,400
Cash payments			(5,181)
Foreign currency translation adjustments and other			(446)
Second Half 2024 Restructuring \| Other
Restructuring Cost and Reserve [Line Items]
Restructuring related charges	0	(683)	0	183
Restructuring Reserve	$ 4,843		4,843			$ 4,843
Charges			0		$ 29,300
Cash payments			0
Foreign currency translation adjustments and other			$ 0
Second Half 2024 Restructuring \| Other \| Income Statement Location [Axis]: us-gaap:OtherNonoperatingIncomeExpense
Restructuring Cost and Reserve [Line Items]
Restructuring related charges		$ 100		$ (100)