Revenues - Disaggregation of Revenue (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]
Revenues	$ 418.7	$ 513.6	$ 840.2	$ 983.1
North America
Disaggregation of Revenue [Line Items]
Revenues	127.5	155.9	245.6	300.4
Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	159.8	214.1	343.5	408.7
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	112.7	118.7	213.0	227.9
Latin America
Disaggregation of Revenue [Line Items]
Revenues	18.7	24.9	38.1	46.1
Catalysts Technologies
Disaggregation of Revenue [Line Items]
Revenues	309.0	395.7	617.0	745.4
Catalysts Technologies | North America
Disaggregation of Revenue [Line Items]
Revenues	95.7	124.7	186.7	242.7
Catalysts Technologies | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	114.4	159.9	243.0	291.4
Catalysts Technologies | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	87.9	94.7	166.0	182.8
Catalysts Technologies | Latin America
Disaggregation of Revenue [Line Items]
Revenues	11.0	16.4	21.3	28.5
Catalysts Technologies | Refining Catalysts
Disaggregation of Revenue [Line Items]
Revenues	149.2	208.3	317.8	390.1
Catalysts Technologies | Refining Catalysts | North America
Disaggregation of Revenue [Line Items]
Revenues	49.1	71.9	104.8	144.1
Catalysts Technologies | Refining Catalysts | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	58.2	73.7	134.1	140.3
Catalysts Technologies | Refining Catalysts | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	33.2	50.1	64.7	85.8
Catalysts Technologies | Refining Catalysts | Latin America
Disaggregation of Revenue [Line Items]
Revenues	8.7	12.6	14.2	19.9
Catalysts Technologies | Polyolefin and Chemical Catalysts
Disaggregation of Revenue [Line Items]
Revenues	159.8	187.4	299.2	355.3
Catalysts Technologies | Polyolefin and Chemical Catalysts | North America
Disaggregation of Revenue [Line Items]
Revenues	46.6	52.8	81.9	98.6
Catalysts Technologies | Polyolefin and Chemical Catalysts | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	56.2	86.2	108.9	151.1
Catalysts Technologies | Polyolefin and Chemical Catalysts | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	54.7	44.6	101.3	97.0
Catalysts Technologies | Polyolefin and Chemical Catalysts | Latin America
Disaggregation of Revenue [Line Items]
Revenues	2.3	3.8	7.1	8.6
Materials Technologies
Disaggregation of Revenue [Line Items]
Revenues	109.7	117.9	223.2	237.7
Materials Technologies | North America
Disaggregation of Revenue [Line Items]
Revenues	31.8	31.2	58.9	57.7
Materials Technologies | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	45.4	54.2	100.5	117.3
Materials Technologies | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	24.8	24.0	47.0	45.1
Materials Technologies | Latin America
Disaggregation of Revenue [Line Items]
Revenues	7.7	8.5	16.8	17.6
Materials Technologies | Consumer/Pharma
Disaggregation of Revenue [Line Items]
Revenues	43.6	37.8	77.1	74.8
Materials Technologies | Consumer/Pharma | North America
Disaggregation of Revenue [Line Items]
Revenues	19.3	12.6	29.6	21.9
Materials Technologies | Consumer/Pharma | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	13.4	13.8	27.0	32.8
Materials Technologies | Consumer/Pharma | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	6.5	6.4	11.3	10.4
Materials Technologies | Consumer/Pharma | Latin America
Disaggregation of Revenue [Line Items]
Revenues	4.4	5.0	9.2	9.7
Materials Technologies | Coatings
Disaggregation of Revenue [Line Items]
Revenues	29.8	35.6	66.4	73.8
Materials Technologies | Coatings | North America
Disaggregation of Revenue [Line Items]
Revenues	5.7	7.0	12.9	14.0
Materials Technologies | Coatings | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	14.1	17.6	32.5	37.3
Materials Technologies | Coatings | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	8.7	9.1	17.3	18.5
Materials Technologies | Coatings | Latin America
Disaggregation of Revenue [Line Items]
Revenues	1.3	1.9	3.7	4.0
Materials Technologies | Chemical process
Disaggregation of Revenue [Line Items]
Revenues	33.0	38.3	70.8	77.2
Materials Technologies | Chemical process | North America
Disaggregation of Revenue [Line Items]
Revenues	6.3	9.1	14.5	18.1
Materials Technologies | Chemical process | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	15.2	19.7	34.2	39.6
Materials Technologies | Chemical process | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	9.5	8.1	18.2	15.8
Materials Technologies | Chemical process | Latin America
Disaggregation of Revenue [Line Items]
Revenues	2.0	1.4	3.9	3.7
Materials Technologies | Other
Disaggregation of Revenue [Line Items]
Revenues	3.3	6.2	8.9	11.9
Materials Technologies | Other | North America
Disaggregation of Revenue [Line Items]
Revenues	0.5	2.5	1.9	3.7
Materials Technologies | Other | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	2.7	3.1	6.8	7.6
Materials Technologies | Other | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	0.1	0.4	0.2	0.4
Materials Technologies | Other | Latin America
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0	$ 0.2	$ 0.0	$ 0.2