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Summary of Significant Accounting Policies and Other Matters 1 Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Significant Accounting Policies [Abstract]
Book overdraft balance	$ 21	$ 12
Percent ownership interest, minimum	20.00%
Percent ownership interest, maximum	50.00%
Interest cost capitalized	$ 1.2	$ 6.6	$ 25.7

Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing.

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