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Guarantees (Tables)

12 Months Ended

Dec. 31, 2011

Guarantees to provide financial and performance assurance to third parties

We enter into various guarantees to provide financial and performance assurance to third parties on behalf of our affiliates. As of December 31, 2011, we had the following guarantees:



	Maximum Potential		Liability
	Future Payments	Outstanding	Recorded
	(Millions of Dollars)

Guarantees	$2.7	$0.1	$—
Letters of Credit	$1.6	$0.1	$—