Accounts Receivable Securitization (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2011 segment M party D note Y	Dec. 31, 2010
Accounts Receivable Securitization
Period for which the entity will be able to comply with the financial covenants pertaining to the Receivable Purchase Agreement (in months)	12
Maximum average collection cycle for accounts receivable (in days)	60
Fair value of deferred purchase price notes	$ 79.5
Maximum capacity of the securitization program	200.0
Amount of accounts receivable sold to Purchaser and being serviced by the entity	$ 119.3	$ 123.0