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Summary Of Significant Accounting Policies (Revenue Recognition and Accounts Receivable) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 12.4	$ 12.7
Collection of accounts receivable, period	1 year
Accounts receivable related to straight-line rents	$ 66.1us-gaap_DeferredRentReceivablesNet	$ 60.6us-gaap_DeferredRentReceivablesNet

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee.

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