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Accounts Receivable - Table 2 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Activity Related to our Allowance for Doubtful Accounts
Balance at Beginning of Period	$ 22.7	$ 30.1	$ 27.6
Additions and Charges to Expense	21.0	16.4	30.7
Deductions and Accounts Written off	(22.3)	(23.8)	(28.2)
Balance at End of Period	$ 21.4	$ 22.7	$ 30.1

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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