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Unconsolidated Affiliate (Details) (Advanced Refining Technologies LLC joint venture (ART), USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Investment in unconsolidated affiliates
Equity method investment, ownership interest (as a percent)	50.00%		50.00%
Sales of catalysts to equity method investee	$ 53.4	$ 48.7	$ 153.1	$ 162.0
Charges to equity method investee for fixed costs, research and development and selling, general and administrative services	7.2	7.1	22.3	20.8
Commitment fee on credit facility (as a percent)			0.10%
W.R. Grace & Co
Investment in unconsolidated affiliates
Line of credit facility, maximum provided by Grace and Chevron each	15.0		15.0
Chevron
Investment in unconsolidated affiliates
Line of credit facility, maximum provided by Grace and Chevron each	$ 15.0		$ 15.0

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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