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Accounts Receivable Sales Agreements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net cash received from receivables sold     $ 929.5   $ 827.5
Loss on sales of receivables 5.8 6.9 16.4 15.6  
Outstanding accounts receivable associated with retail finance joint ventures in Brazil and Australia $ 86.3   $ 86.3   $ 62.0
Corporate Joint Venture [Member]
         
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Joint venture ownership percentage 49.00%   49.00%   49.00%