Quarterly report pursuant to Section 13 or 15(d)

Sale of Accounts Receivable - Additional Information (Detail)

v2.4.0.6
Sale of Accounts Receivable - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maximum amount of accounts receivable sold at any point in time $ 237.5    
Decrease in receivables related to balances sold 135.5 115.4 123.0
Sale of accounts receivable 598.3    
Funding fee $ 1.0