Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 469.5	$ 431.5
North America
Disaggregation of Revenue [Line Items]
Revenues	144.5	126.0
Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	194.6	178.7
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	109.2	100.2
Latin America
Disaggregation of Revenue [Line Items]
Revenues	21.2	26.6
Catalysts Technologies
Disaggregation of Revenue [Line Items]
Revenues	349.7	315.8
Catalysts Technologies | North America
Disaggregation of Revenue [Line Items]
Revenues	118.0	102.1
Catalysts Technologies | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	131.5	119.7
Catalysts Technologies | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	88.1	76.8
Catalysts Technologies | Latin America
Disaggregation of Revenue [Line Items]
Revenues	12.1	17.2
Catalysts Technologies | Refining Catalysts
Disaggregation of Revenue [Line Items]
Revenues	181.8	183.4
Catalysts Technologies | Refining Catalysts | North America
Disaggregation of Revenue [Line Items]
Revenues	72.2	69.9
Catalysts Technologies | Refining Catalysts | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	66.6	61.3
Catalysts Technologies | Refining Catalysts | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	35.7	38.8
Catalysts Technologies | Refining Catalysts | Latin America
Disaggregation of Revenue [Line Items]
Revenues	7.3	13.4
Catalysts Technologies | Polyolefin and Chemical Catalysts
Disaggregation of Revenue [Line Items]
Revenues	167.9	132.4
Catalysts Technologies | Polyolefin and Chemical Catalysts | North America
Disaggregation of Revenue [Line Items]
Revenues	45.8	32.2
Catalysts Technologies | Polyolefin and Chemical Catalysts | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	64.9	58.4
Catalysts Technologies | Polyolefin and Chemical Catalysts | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	52.4	38.0
Catalysts Technologies | Polyolefin and Chemical Catalysts | Latin America
Disaggregation of Revenue [Line Items]
Revenues	4.8	3.8
Materials Technologies
Disaggregation of Revenue [Line Items]
Revenues	119.8	115.7
Materials Technologies | North America
Disaggregation of Revenue [Line Items]
Revenues	26.5	23.9
Materials Technologies | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	63.1	59.0
Materials Technologies | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	21.1	23.4
Materials Technologies | Latin America
Disaggregation of Revenue [Line Items]
Revenues	9.1	9.4
Materials Technologies | Coatings
Disaggregation of Revenue [Line Items]
Revenues	38.2	41.7
Materials Technologies | Coatings | North America
Disaggregation of Revenue [Line Items]
Revenues	7.0	7.1
Materials Technologies | Coatings | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	19.7	20.5
Materials Technologies | Coatings | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	9.4	11.8
Materials Technologies | Coatings | Latin America
Disaggregation of Revenue [Line Items]
Revenues	2.1	2.3
Materials Technologies | Consumer/Pharma
Disaggregation of Revenue [Line Items]
Revenues	37.0	29.9
Materials Technologies | Consumer/Pharma | North America
Disaggregation of Revenue [Line Items]
Revenues	9.3	7.7
Materials Technologies | Consumer/Pharma | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	19.0	13.2
Materials Technologies | Consumer/Pharma | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	4.0	4.3
Materials Technologies | Consumer/Pharma | Latin America
Disaggregation of Revenue [Line Items]
Revenues	4.7	4.7
Materials Technologies | Chemical process
Disaggregation of Revenue [Line Items]
Revenues	38.9	37.7
Materials Technologies | Chemical process | North America
Disaggregation of Revenue [Line Items]
Revenues	9.0	7.4
Materials Technologies | Chemical process | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	19.9	20.8
Materials Technologies | Chemical process | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	7.7	7.2
Materials Technologies | Chemical process | Latin America
Disaggregation of Revenue [Line Items]
Revenues	2.3	2.3
Materials Technologies | Other
Disaggregation of Revenue [Line Items]
Revenues	5.7	6.4
Materials Technologies | Other | North America
Disaggregation of Revenue [Line Items]
Revenues	1.2	1.7
Materials Technologies | Other | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	4.5	4.5
Materials Technologies | Other | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.1
Materials Technologies | Other | Latin America
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0	$ 0.1