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Accrued Expenses Accrued Expenses Footnote (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Acquisition and integration related costs		$ 17,263	$ 20,684	$ 19,377
Total Current Liabilities
Concentration Risk [Line Items]
Benchmark for individual components of accrued expenses, percentage		5.00%
Lithium Hydroxide Conversion Assets
Concentration Risk [Line Items]
Ownership percentage	40.00%	40.00%
Mineral Resources Limited Wodgina Project
Concentration Risk [Line Items]
Ownership percentage	60.00%	60.00%
Stamp duty tax | Mineral Resources Limited Wodgina Project
Concentration Risk [Line Items]
Acquisition and integration related costs		$ 61,500	$ 64,800

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