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Segmental Reporting (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segmental reporting
Net sales	$ 199.4	$ 200.8
Gross profit	63.8	64.0
Pension credit/(charge)	(0.7)	0.1
Corporate costs	(11.5)	(8.6)
Restructuring charge	0	(0.1)
Impairment of Octane Additives segment goodwill	(0.3)	(0.3)
Operating income	22.2	31.2
Fuel Specialties [Member]
Segmental reporting
Net sales	140.0	130.7
Gross profit	47.0	38.7
Operating income	24.9	21.7
Performance Chemicals [Member]
Segmental reporting
Net sales	47.8	46.5
Gross profit	10.5	11.1
Operating income	5.0	6.0
Octane Additives [Member]
Segmental reporting
Net sales	11.6	23.6
Gross profit	6.3	14.2
Operating income	$ 4.8	$ 12.4

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Corporate costs.

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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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The net result for the period of deducting operating expenses from operating revenues.

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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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