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Segment Reporting - Segment Reporting (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Net sales $ 326.3 $ 228.0 $ 620.6 $ 440.1
Gross profit 105.1 85.5 196.0 161.7
Adjustment to fair value of contingent consideration 0.0 2.4 0.0 4.0
Loss on disposal of subsidiary (1.0) 0.0 (1.0) (1.4)
Foreign exchange loss on liquidation of subsidiary 0.0 0.0 (1.8) 0.0
Operating income 34.7 28.6 61.1 54.2
Operating Segments [Member] | Fuel Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales 121.3 129.3 247.7 252.7
Gross profit 45.2 43.7 91.3 85.7
Operating income 23.8 24.2 50.6 48.1
Operating Segments [Member] | Fuel Specialties [Member] | Refinery and Performance [Member]        
Segment Reporting Information [Line Items]        
Net sales 88.7 93.7 189.1 192.0
Operating Segments [Member] | Fuel Specialties [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Net sales 32.6 35.6 58.6 60.7
Operating Segments [Member] | Performance Chemicals [Member]        
Segment Reporting Information [Line Items]        
Net sales 104.9 35.3 199.4 70.0
Gross profit 17.4 11.3 34.1 22.1
Operating income 6.5 4.7 12.5 9.1
Operating Segments [Member] | Performance Chemicals [Member] | Personal Care [Member]        
Segment Reporting Information [Line Items]        
Net sales 48.6 31.8 96.1 64.0
Operating Segments [Member] | Performance Chemicals [Member] | Home Care [Member]        
Segment Reporting Information [Line Items]        
Net sales 29.4 0.6 56.3 0.9
Operating Segments [Member] | Performance Chemicals [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Net sales 26.9 2.9 47.0 5.1
Operating Segments [Member] | Oilfield Services [Member]        
Segment Reporting Information [Line Items]        
Net sales 76.1 46.5 142.6 82.7
Gross profit 29.0 19.9 54.4 31.5
Operating income 3.7 (1.6) 6.7 (7.1)
Operating Segments [Member] | Octane Additives [Member]        
Segment Reporting Information [Line Items]        
Net sales 24.0 16.9 30.9 34.7
Gross profit 13.5 10.6 16.2 22.4
Operating income 12.8 9.6 14.8 20.6
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Pension credit 1.0 1.7 2.1 3.5
Corporate costs (12.1) (12.4) (22.8) (22.6)
Segment Reconciling Items [Member]        
Segment Reporting Information [Line Items]        
Loss on disposal of subsidiary $ (1.0) $ 0.0 $ (1.0) $ (1.4)