v3.3.1.900
Discontinued Operations - Additional Information (Detail) - Aromatics [Member]
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash received from business disposal $ 52.4 $ 52.4
Business disposal, selling price 47.4 47.4
Advance toward the cost of decommissioning and dismantling business 5.0 5.0
Contingent consideration 5.0 5.0
Working capital adjustment, net 0.2  
INEOS Americas LLC. [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Decommissioning and dismantlement costs   5.0
Discontinued Operations Disposed of by Sale [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Advance toward the cost of decommissioning and dismantling business 4.6 4.6
Contingent consideration 5.5  
Pre tax gain on business disposal 5.3 21.5
Discontinued Operations Disposed of by Sale [Member] | INEOS Americas LLC. [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Advance toward the cost of decommissioning and dismantling business 5.0 5.0
Decommissioning and dismantlement costs $ 5.0 $ 0.8