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Accounts Receivable/Deferred Rent Receivable (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounts Receivable/Deferred Rent Receivable [Abstract]
Allowance for Doubtful Accounts Receivable	$ 7.5	$ 11.3
Provision for Doubtful Accounts	$ (1.9)	$ 3.9	$ 4.3

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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