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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Current Fiscal Year End Date |  | --12-31 |
Carrying Value | [1] | $ 3,166.6 | $ 2,524.1
Fixed Rate Notes Payable [Member] |  |  |
Carrying Value |  | 3,126.9 | 2,380.4
Estimated Fair Value |  | 3,519.9 | 2,533.5
Floating Rate Notes Payable [Member] |  |  |
Carrying Value |  | 39.7 | 143.7
Estimated Fair Value |  | $ 40.0 | $ 143.8
[1] | Unamortized debt discounts and debt issuance costs of $23.4 million and $19.9 million are included in senior unsecured notes payable as of December 31, 2020 and 2019, respectively.

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