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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Carrying Value | [1] | $ 3,747.8 |  | $ 3,680.9 |  |
Fixed rate notes payable |  |  |  |  |  |
Carrying Value |  | 3,114.7 |  | 3,114.0 |  |
Estimated Fair Value |  | 2,843.0 |  | 2,806.1 |  |
Floating rate notes payable (1) |  |  |  |  |  |
Carrying Value |  | 633.1 | [2] | 566.9 | [2] | $ 539.9
Estimated Fair Value | [2] | $ 633.5 |  | $ 566.8 |  |
[1] | Unamortized debt discounts, debt issuance costs, and fair market value adjustments of $17.1 million and $18.0 million are included in notes payable as of March 31, 2023 and December 31, 2022, respectively.
[2] | Includes balances outstanding under our unsecured revolving credit facility at March 31, 2023 and December 31, 2022

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