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Segmental Reporting (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segmental reporting
Net sales	$ 183.4	$ 202.1	$ 562.7	$ 573.9
Gross profit	50.7	57.7	171.4	168.6
Pension credit/(charge)	0	(0.1)	0.2	(0.3)
Corporate costs	(9.1)	(6.3)	(25.5)	(20.3)
Restructuring charge	(0.1)	0	(0.2)	0
Impairment of Octane Additives segment goodwill	(0.3)	(0.6)	(0.9)	(1.7)
Profit on disposal	0.1	0	0.1	0
Operating income/(loss)	17.3	(20.2)	72.6	26.1
Fuel Specialties [Member]
Segmental reporting
Net sales	127.0	136.1	372.2	376.5
Gross profit	36.8	38.1	110.2	105.6
Operating income/(loss)	19.6	19.9	58.2	54.5
Octane Additives [Member]
Segmental reporting
Net sales	9.6	22.1	52.3	58.3
Gross profit	3.5	10.0	27.6	28.0
Operating income/(loss)	1.5	(38.1)	21.9	(27.8)
Performance Chemicals [Member]
Segmental reporting
Net sales	46.8	43.9	138.2	139.1
Gross profit	10.4	9.6	33.6	35.0
Operating income/(loss)	$ 5.6	$ 5.0	$ 18.8	$ 21.7

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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.

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The gains (losses) included in earnings resulting from the sale or disposal of tangible assets. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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