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Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)		Dec. 31, 2019 USD ($)
Current Fiscal Year End Date	--12-31
Deferred compensation plan investments	$ 129.8	[1]	$ 151.8
Participant Withdrawals From Deferred Compensation Plan Investments	37.8		$ 18.0
Number of Operating properties Acquired			4
Level 1 [Member]
Deferred compensation plan investments	129.8		$ 151.8
Fair Value, Inputs, Level 2 [Member]
Deferred compensation plan investments	0.0		0.0
Level 3 [Member]
Deferred compensation plan investments	$ 0.0		$ 0.0
[1] Approximately $37.8 million and $18.0 million of participant cash was withdrawn from our deferred compensation plan investments during the years ended December 31, 2020 and 2019, respectively.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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