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Derivatives Sales, Receivables and Postretirement Cost Sharing Asset by Major Customer (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
General Motors [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	73.00%	73.00%	75.00%
Fair Value, Concentration of Risk, Accounts Receivable	$ 325.8	$ 234.7
Chrysler Group LLC [Member]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	10.00%	8.00%	9.00%
Fair Value, Concentration of Risk, Accounts Receivable	$ 43.5	$ 29.1

This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

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