Goodwill and Other Intangibles - Changes in Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 1,665,520
Reclass to assets held for sale	(6,586)
Foreign currency translation adjustments	(18,214)
Balance at end of period	1,640,720
Reportable Segments | Lithium
Goodwill [Roll Forward]
Balance at beginning of period	1,441,781
Reclass to assets held for sale	0
Foreign currency translation adjustments	(14,297)
Balance at end of period	1,427,484
Reportable Segments | Bromine Specialties
Goodwill [Roll Forward]
Balance at beginning of period	20,319
Reclass to assets held for sale	0
Foreign currency translation adjustments	0
Balance at end of period	20,319
Reportable Segments | Catalysts
Goodwill [Roll Forward]
Balance at beginning of period	196,834
Reclass to assets held for sale	0
Foreign currency translation adjustments	(3,917)
Balance at end of period	192,917
Reportable Segments | All Other
Goodwill [Roll Forward]
Balance at beginning of period	6,586
Reclass to assets held for sale	(6,586)
Foreign currency translation adjustments	0
Balance at end of period	$ 0