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Other Intangible Assets (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 24, 2012
Dec. 31, 2012
Strata Control Services Inc [Member]
Dec. 24, 2012
Strata Control Services Inc [Member]
Dec. 31, 2012
Ethyl [Member]
Dec. 31, 2011
Ethyl [Member]
Dec. 31, 2008
Ethyl [Member]
Jun. 30, 2007
Ethyl [Member]
Dec. 31, 2012
Technology [Member]
Dec. 31, 2011
Technology [Member]
Dec. 31, 2012
Customer relationships [Member]
Dec. 31, 2011
Customer relationships [Member]
Dec. 31, 2012
Patents [Member]
Dec. 31, 2011
Patents [Member]
Dec. 31, 2012
Internally Developed Software and Other Costs [Member]
Dec. 31, 2011
Internally Developed Software and Other Costs [Member]
Dec. 31, 2012
Innospec Fuel Specialties LLC [Member]
Dec. 31, 2012
Innospec Fuel Specialties LLC [Member]
Technology [Member]
Dec. 31, 2012
Innospec Widnes Limited [Member]
Intangible Assets (Textual) [Abstract]                                          
Intangible asset $ 106.2 $ 51.2         $ 22.1 $ 22.1   $ 28.4 $ 7.1 $ 7.1 $ 16.0 $ 16.0 $ 2.9 $ 2.9 $ 10.1 $ 3.1      
Contract provisions offset against intangible assets                 6.3                        
Assets being amortized duration 10 years                   10 years   13 years   10 years            
Amortization expense 4.1 4.4 4.7       1.6 1.9     0.7 0.7 1.5 1.5 0.3 0.3 0 0      
Percentage of voting equity interest acquired       100.00%   100.00%                              
Allocation of purchase price to other intangible assets 48.0       48.0                                
Weighted average expected life 13 years                                        
Percent of remaining interest of entity                     50.00%                    
Anticipated residual value                     0   0                
Intangible assets, recognized 7.1                   4.8   4.2           9.0 2.3 2.8
Cost of goods, amortization 2.6 2.9 3.1                                    
Future amortization expense for 2013                                 10.0        
Future amortization expense for 2014                                 10.5        
Future amortization expense for 2015                                 $ 9.5