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Segmental Reporting - Segment Reporting (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |
Net sales | $ 220.7 | $ 199.4
Gross profit | 65.7 | 63.8
Operating income | 18.0 | 22.2
Pension credit/(charge) | 0.8 | 0.7
Restructuring charge | (0.2) | 0
Impairment of Octane Additives segment goodwill | 0 | (0.3)
Operating Segments [Member] | Fuel Specialties [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 164.2 | 140.0
Gross profit | 52.0 | 47.0
Operating income | 25.8 | 24.9
Operating Segments [Member] | Performance Chemicals [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 56.1 | 47.8
Gross profit | 13.6 | 10.5
Operating income | 6.5 | 5.0
Operating Segments [Member] | Octane Additives [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 0.4 | 11.6
Gross profit | 0.1 | 6.3
Operating income | (1.2) | 4.8
Segment Reconciling Items [Member] |  |
Segment Reporting Information [Line Items] |  |
Pension credit/(charge) | (0.8) | (0.7)
Restructuring charge | (0.2) | 0
Impairment of Octane Additives segment goodwill | 0 | (0.3)
Corporate, Non-Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Corporate costs | $ (12.1) | $ (11.5)

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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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