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Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Goodwill
At January 1 Gross cost			$ 674.0	$ 674.1
Exchange effect			0	0.3
At June 30 Gross cost	674.0	674.4	674.0	674.4
Impairment of Octane Additives segment goodwill	(0.3)	(0.5)	(0.6)	(1.1)
Total	439.4	441.3	439.4	441.3	440.0	442.1
Accumulated amortization	(298.6)	(298.7)	(298.6)	(298.7)	(298.5)	(298.5)
Exchange effect			(0.1)	(0.2)
Goodwill	140.8	142.6	140.8	142.6	141.5
Octane Additives [Member]
Goodwill
Accumulated impairment of Octane Additives segment goodwill	(234.6)	(233.1)	(234.6)	(233.1)	(234.0)	(232.0)
Impairment of Octane Additives segment goodwill			(0.6)	(1.1)
Goodwill	1.8	3.5	1.8	3.5
Fuel specialties and active chemicals segments [Member]
Goodwill
Goodwill	$ 139.0	$ 139.1	$ 139.0	$ 139.1

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- Definition

Accumulated amortization of goodwill recognized prior to the adoption of changes in US GAAP.

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The increase (decrease) to the recorded value of goodwill amortization, recognized prior to the adoption of any changes in generally accepted accounting principles, for foreign currency translation adjustments.' This is not associated with the Octane Additives member.

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Goodwill net of impairment, unadjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Gross amount, as of the balance sheet date, of the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable), in excess of the fair value of net assets acquired in one or more business combination transactions.

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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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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