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Revenues - Disaggregation of Revenue by Product Line (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 270.6	$ 352.8	$ 558.8	$ 629.6
Performance Materials segment
Disaggregation of Revenue [Line Items]
Net sales	84.4	123.1	205.5	232.2
Performance Materials segment | Automotive Technologies product line
Disaggregation of Revenue [Line Items]
Net sales	74.7	113.9	187.6	213.6
Performance Materials segment | Process Purification product line
Disaggregation of Revenue [Line Items]
Net sales	9.7	9.2	17.9	18.6
Performance Chemicals segment
Disaggregation of Revenue [Line Items]
Net sales	186.2	229.7	353.3	397.4
Performance Chemicals segment | Oilfield Technologies product line
Disaggregation of Revenue [Line Items]
Net sales	14.2	29.7	44.4	58.9
Performance Chemicals segment | Pavement Technologies product line
Disaggregation of Revenue [Line Items]
Net sales	63.9	64.6	84.6	83.1
Performance Chemicals segment | Industrial Specialties product line
Disaggregation of Revenue [Line Items]
Net sales	76.5	101.1	156.4	196.9
Performance Chemicals segment | Engineered Polymers product line
Disaggregation of Revenue [Line Items]
Net sales	$ 31.6	$ 34.3	$ 67.9	$ 58.5

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