Goodwill and Other Intangibles - Changes in Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 1,578,785
Foreign currency translation adjustments and other	5,462
Balance at end of period	1,571,280
Reportable Segments | Lithium
Goodwill [Roll Forward]
Balance at beginning of period	1,370,846
Foreign currency translation adjustments and other	4,917
Balance at end of period	1,362,796
Reportable Segments | Bromine Specialties
Goodwill [Roll Forward]
Balance at beginning of period	20,319
Foreign currency translation adjustments and other	0
Balance at end of period	20,319
Reportable Segments | Catalysts
Goodwill [Roll Forward]
Balance at beginning of period	181,034
Foreign currency translation adjustments and other	545
Balance at end of period	181,579
Reportable Segments | All Other
Goodwill [Roll Forward]
Balance at beginning of period	6,586
Foreign currency translation adjustments and other	0
Balance at end of period	6,586
Mineral Resources Limited Wodgina Project
Goodwill [Roll Forward]
Acquisitions	(12,967)
Balance at end of period	18,795
Mineral Resources Limited Wodgina Project | Reportable Segments | Lithium
Goodwill [Roll Forward]
Acquisitions	(12,967)
Mineral Resources Limited Wodgina Project | Reportable Segments | Bromine Specialties
Goodwill [Roll Forward]
Acquisitions	0
Mineral Resources Limited Wodgina Project | Reportable Segments | Catalysts
Goodwill [Roll Forward]
Acquisitions	0
Mineral Resources Limited Wodgina Project | Reportable Segments | All Other
Goodwill [Roll Forward]
Acquisitions	$ 0