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Segment information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information, Profit (Loss)        
Net sales $ 260.3 $ 245.4 $ 478.8 $ 445.0
Segment operating profits 57.1 49.2 97.0 88.5
Separation costs (0.2) (4.7) (0.5) (11.1)
Restructuring and other (income) charges (1.1) (1.0) (3.4) (5.6)
Interest expense, net (2.8) (5.0) (6.1) (10.4)
Provision for income taxes (17.2) (12.6) (28.2) (23.8)
Net income (loss) attributable to noncontrolling interests (3.7) (1.8) (7.7) (4.3)
Net income (loss) attributable to Ingevity stockholders 32.1 24.1 51.1 33.3
Performance Materials        
Segment Reporting Information, Profit (Loss)        
Net sales 89.5 74.2 172.9 144.3
Segment operating profits 30.7 26.2 60.2 56.9
Restructuring and other (income) charges, net   0.0   0.8
Performance Chemicals        
Segment Reporting Information, Profit (Loss)        
Net sales 170.8 171.2 305.9 300.7
Segment operating profits 26.4 23.0 36.8 31.6
Restructuring and other (income) charges, net $ 1.1 $ 1.0 $ 3.4 $ 4.8