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Segment Reporting and Geographical Area Data - Segment Reporting on Basis of Geographical Location (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 1,012.3 $ 960.9 $ 818.8
Income before income taxes 152.3 110.9 92.8
Long-lived assets at year end 246.1 263.0 189.1
Goodwill 267.4 276.1 187.9
Identifiable assets at year end 1,030.0 999.9 794.7
Octane Additives [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Income before income taxes 0.0 0.0 (1.3)
Goodwill 0.0 0.0 0.0
United States [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 571.9 468.6 276.1
Income before income taxes 52.7 15.2 10.0
Long-lived assets at year end 185.8 197.9 148.2
Identifiable assets at year end 412.3 449.3 291.7
United Kingdom [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 445.2 486.1 502.4
Income before income taxes 60.6 57.8 43.7
Long-lived assets at year end 49.3 54.1 29.4
Identifiable assets at year end 303.4 216.4 261.5
Rest of Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 133.3 146.9 129.1
Income before income taxes 42.0 39.3 40.4
Long-lived assets at year end 10.6 10.4 11.5
Identifiable assets at year end 30.9 39.0 53.2
Rest of World [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 22.1 21.4 0.2
Income before income taxes (3.0) (1.4) 0.0
Long-lived assets at year end 0.4 0.6 0.0
Identifiable assets at year end 16.0 19.1 0.4
Sales Between Areas [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ (160.2) $ (162.1) $ (89.0)