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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Carrying Value | [1] | $ 3,680.9 | $ 3,170.4
Fixed Rate Notes Payable [Member] |  |  |
Carrying Value |  | 3,114.0 | 3,130.5
Estimated Fair Value |  | 2,806.1 | 3,363.7
Floating Rate Notes Payable [Member] |  |  |
Carrying Value | [2] | 566.9 | 39.9
Estimated Fair Value | [2] | $ 566.8 | $ 40.1
[1] | Unamortized debt discounts, debt issuance costs, and fair market value adjustments of $18.0 million and $19.6 million are included in senior unsecured notes payable as of December 31, 2022 and 2021, respectively.
[2] | Includes balances outstanding under our unsecured credit facility at December 31, 2022.

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- Definition Fair value portion of notes payable. + References 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 210.5-02.19,20,22) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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