Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 494.9	$ 429.5	$ 1,412.1	$ 1,257.0
North America
Disaggregation of Revenue [Line Items]
Net sales	152.9	118.8	426.3	355.3
Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Net sales	187.9	173.2	552.0	485.8
Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	123.5	119.6	347.8	335.0
Latin America
Disaggregation of Revenue [Line Items]
Net sales	30.6	17.9	86.0	80.9
Catalysts Technologies
Disaggregation of Revenue [Line Items]
Net sales	378.2	317.5	1,058.4	931.8
Catalysts Technologies | North America
Disaggregation of Revenue [Line Items]
Net sales	125.3	96.7	346.2	281.3
Catalysts Technologies | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Net sales	128.8	118.1	376.1	325.6
Catalysts Technologies | Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	101.8	93.3	277.2	268.4
Catalysts Technologies | Latin America
Disaggregation of Revenue [Line Items]
Net sales	22.3	9.4	58.9	56.5
Catalysts Technologies | Refining Catalysts
Disaggregation of Revenue [Line Items]
Net sales	204.9	196.5	584.4	561.6
Catalysts Technologies | Refining Catalysts | North America
Disaggregation of Revenue [Line Items]
Net sales	71.7	71.0	208.8	197.6
Catalysts Technologies | Refining Catalysts | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Net sales	67.4	65.5	189.7	173.5
Catalysts Technologies | Refining Catalysts | Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	49.6	54.3	141.8	146.2
Catalysts Technologies | Refining Catalysts | Latin America
Disaggregation of Revenue [Line Items]
Net sales	16.2	5.7	44.1	44.3
Catalysts Technologies | Polyolefin and Chemical Catalysts
Disaggregation of Revenue [Line Items]
Net sales	173.3	121.0	474.0	370.2
Catalysts Technologies | Polyolefin and Chemical Catalysts | North America
Disaggregation of Revenue [Line Items]
Net sales	53.6	25.7	137.4	83.7
Catalysts Technologies | Polyolefin and Chemical Catalysts | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Net sales	61.4	52.6	186.4	152.1
Catalysts Technologies | Polyolefin and Chemical Catalysts | Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	52.2	39.0	135.4	122.2
Catalysts Technologies | Polyolefin and Chemical Catalysts | Latin America
Disaggregation of Revenue [Line Items]
Net sales	6.1	3.7	14.8	12.2
Materials Technologies
Disaggregation of Revenue [Line Items]
Net sales	116.7	112.0	353.7	325.2
Materials Technologies | North America
Disaggregation of Revenue [Line Items]
Net sales	27.6	22.1	80.1	74.0
Materials Technologies | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Net sales	59.1	55.1	175.9	160.2
Materials Technologies | Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	21.7	26.3	70.6	66.6
Materials Technologies | Latin America
Disaggregation of Revenue [Line Items]
Net sales	8.3	8.5	27.1	24.4
Materials Technologies | Coatings
Disaggregation of Revenue [Line Items]
Net sales	37.7	37.2	120.6	107.4
Materials Technologies | Coatings | North America
Disaggregation of Revenue [Line Items]
Net sales	7.5	7.0	22.3	20.1
Materials Technologies | Coatings | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Net sales	19.0	16.6	59.2	51.1
Materials Technologies | Coatings | Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	9.4	11.5	32.6	30.1
Materials Technologies | Coatings | Latin America
Disaggregation of Revenue [Line Items]
Net sales	1.8	2.1	6.5	6.1
Materials Technologies | Consumer/Pharma
Disaggregation of Revenue [Line Items]
Net sales	34.8	28.2	97.7	88.8
Materials Technologies | Consumer/Pharma | North America
Disaggregation of Revenue [Line Items]
Net sales	9.5	6.3	26.1	27.7
Materials Technologies | Consumer/Pharma | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Net sales	16.2	12.3	42.9	34.9
Materials Technologies | Consumer/Pharma | Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	4.3	5.2	14.5	12.6
Materials Technologies | Consumer/Pharma | Latin America
Disaggregation of Revenue [Line Items]
Net sales	4.8	4.4	14.2	13.6
Materials Technologies | Chemical process
Disaggregation of Revenue [Line Items]
Net sales	38.7	41.0	117.7	113.9
Materials Technologies | Chemical process | North America
Disaggregation of Revenue [Line Items]
Net sales	9.1	7.3	26.6	21.7
Materials Technologies | Chemical process | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Net sales	19.9	22.1	61.6	63.8
Materials Technologies | Chemical process | Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	8.0	9.6	23.2	23.8
Materials Technologies | Chemical process | Latin America
Disaggregation of Revenue [Line Items]
Net sales	1.7	2.0	6.3	4.6
Materials Technologies | Other
Disaggregation of Revenue [Line Items]
Net sales	5.5	5.6	17.7	15.1
Materials Technologies | Other | North America
Disaggregation of Revenue [Line Items]
Net sales	1.5	1.5	5.1	4.5
Materials Technologies | Other | Europe Middle East Africa (EMEA)
Disaggregation of Revenue [Line Items]
Net sales	4.0	4.1	12.2	10.4
Materials Technologies | Other | Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.3	0.1
Materials Technologies | Other | Latin America
Disaggregation of Revenue [Line Items]
Net sales	$ 0.0	$ 0.0	$ 0.1	$ 0.1