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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[1] | Approximately $37.8 million and $18.0 million of participant cash was withdrawn from our deferred compensation plan investments during the years ended December 31, 2020 and 2019, respectively.

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