Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 513.6	$ 485.7	$ 983.1	$ 917.2
North America
Disaggregation of Revenue [Line Items]
Revenues	155.9	147.4	300.4	273.4
Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	214.1	185.4	408.7	364.1
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	118.7	124.1	227.9	224.3
Latin America
Disaggregation of Revenue [Line Items]
Revenues	24.9	28.8	46.1	55.4
Catalysts Technologies
Disaggregation of Revenue [Line Items]
Revenues	395.7	364.4	745.4	680.2
Catalysts Technologies | North America
Disaggregation of Revenue [Line Items]
Revenues	124.7	118.8	242.7	220.9
Catalysts Technologies | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	159.9	127.6	291.4	247.3
Catalysts Technologies | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	94.7	98.6	182.8	175.4
Catalysts Technologies | Latin America
Disaggregation of Revenue [Line Items]
Revenues	16.4	19.4	28.5	36.6
Catalysts Technologies | Refining Catalysts
Disaggregation of Revenue [Line Items]
Revenues	208.3	196.1	390.1	379.5
Catalysts Technologies | Refining Catalysts | North America
Disaggregation of Revenue [Line Items]
Revenues	71.9	67.2	144.1	137.1
Catalysts Technologies | Refining Catalysts | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	73.7	61.0	140.3	122.3
Catalysts Technologies | Refining Catalysts | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	50.1	53.4	85.8	92.2
Catalysts Technologies | Refining Catalysts | Latin America
Disaggregation of Revenue [Line Items]
Revenues	12.6	14.5	19.9	27.9
Catalysts Technologies | Polyolefin and Chemical Catalysts
Disaggregation of Revenue [Line Items]
Revenues	187.4	168.3	355.3	300.7
Catalysts Technologies | Polyolefin and Chemical Catalysts | North America
Disaggregation of Revenue [Line Items]
Revenues	52.8	51.6	98.6	83.8
Catalysts Technologies | Polyolefin and Chemical Catalysts | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	86.2	66.6	151.1	125.0
Catalysts Technologies | Polyolefin and Chemical Catalysts | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	44.6	45.2	97.0	83.2
Catalysts Technologies | Polyolefin and Chemical Catalysts | Latin America
Disaggregation of Revenue [Line Items]
Revenues	3.8	4.9	8.6	8.7
Materials Technologies
Disaggregation of Revenue [Line Items]
Revenues	117.9	121.3	237.7	237.0
Materials Technologies | North America
Disaggregation of Revenue [Line Items]
Revenues	31.2	28.6	57.7	52.5
Materials Technologies | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	54.2	57.8	117.3	116.8
Materials Technologies | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	24.0	25.5	45.1	48.9
Materials Technologies | Latin America
Disaggregation of Revenue [Line Items]
Revenues	8.5	9.4	17.6	18.8
Materials Technologies | Coatings
Disaggregation of Revenue [Line Items]
Revenues	35.6	41.2	73.8	82.9
Materials Technologies | Coatings | North America
Disaggregation of Revenue [Line Items]
Revenues	7.0	7.7	14.0	14.8
Materials Technologies | Coatings | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	17.6	19.7	37.3	40.2
Materials Technologies | Coatings | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	9.1	11.4	18.5	23.2
Materials Technologies | Coatings | Latin America
Disaggregation of Revenue [Line Items]
Revenues	1.9	2.4	4.0	4.7
Materials Technologies | Consumer/Pharma
Disaggregation of Revenue [Line Items]
Revenues	37.8	33.0	74.8	62.9
Materials Technologies | Consumer/Pharma | North America
Disaggregation of Revenue [Line Items]
Revenues	12.6	8.9	21.9	16.6
Materials Technologies | Consumer/Pharma | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	13.8	13.5	32.8	26.7
Materials Technologies | Consumer/Pharma | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	6.4	5.9	10.4	10.2
Materials Technologies | Consumer/Pharma | Latin America
Disaggregation of Revenue [Line Items]
Revenues	5.0	4.7	9.7	9.4
Materials Technologies | Chemical process
Disaggregation of Revenue [Line Items]
Revenues	38.3	41.3	77.2	79.0
Materials Technologies | Chemical process | North America
Disaggregation of Revenue [Line Items]
Revenues	9.1	10.1	18.1	17.5
Materials Technologies | Chemical process | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	19.7	20.9	39.6	41.7
Materials Technologies | Chemical process | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	8.1	8.0	15.8	15.2
Materials Technologies | Chemical process | Latin America
Disaggregation of Revenue [Line Items]
Revenues	1.4	2.3	3.7	4.6
Materials Technologies | Other
Disaggregation of Revenue [Line Items]
Revenues	6.2	5.8	11.9	12.2
Materials Technologies | Other | North America
Disaggregation of Revenue [Line Items]
Revenues	2.5	1.9	3.7	3.6
Materials Technologies | Other | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Revenues	3.1	3.7	7.6	8.2
Materials Technologies | Other | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	0.4	0.2	0.4	0.3
Materials Technologies | Other | Latin America
Disaggregation of Revenue [Line Items]
Revenues	$ 0.2	$ 0.0	$ 0.2	$ 0.1