Revenues - Revenue by segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 1,391.5	$ 1,216.1	$ 1,292.9
Performance Materials segment
Disaggregation of Revenue [Line Items]
Net sales	516.8	510.0	490.6
Performance Chemicals segment
Disaggregation of Revenue [Line Items]
Net sales	874.7	706.1	802.3
Performance Chemicals segment | Pavement Technologies product line
Disaggregation of Revenue [Line Items]
Net sales	195.4	186.8	183.3
Performance Chemicals segment | Industrial Specialties product line
Disaggregation of Revenue [Line Items]
Net sales	493.5	391.6	496.9
Performance Chemicals segment | Engineered Polymers product line
Disaggregation of Revenue [Line Items]
Net sales	$ 185.8	$ 127.7	$ 122.1