Summary of Significant Accounting Policies - Accounts Receivable Securitization (Details) (Receivables Securitization [Member], USD $) In Millions, unless otherwise specified	Sep. 08, 2010	Dec. 21, 2009	Apr. 24, 2009
Receivables Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable Securitization Facility Matured And Repaid			$ 50
Company Entered Into New Accounts Receivable Securitization Facility		50
Accounts Receivable Securitization Facility Prior To Amendment	50
Accounts Receivable Facility After Amendment	$ 80