Debt - Credit Facility (Details) (USD $) In Millions	Sep. 30, 2011
Line of Credit Facility [Line Items]
Receivables program maximum capacity	$ 105.0
Receivables facility, letters credit outstanding	24.7
Receivables facility remaining borrowing capacity	80.3
Line of credit facility, amount outstanding	0
Line of credit facility, remaining borrowing capacity	$ 210.0