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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Carrying Value | [1] | $ 3,553.5 | $ 3,715.4
Fixed rate notes payable |  |  |
Carrying Value |  | 3,012.4 | 2,866.9
Estimated Fair Value |  | 2,762.0 | 2,651.6
Floating rate notes payable (1) |  |  |
Carrying Value | [2] | 541.1 | 848.5
Estimated Fair Value | [2] | $ 554.5 | $ 864.9
[1] | Unamortized debt discounts, debt issuance costs, and fair market value adjustments of $17.5 million and $5.5 million are included in notes payable as of March 31, 2024 and December 31, 2023, respectively.
[2] | Includes the senior unsecured notes payable due in 2026 at March 31, 2024 and December 31, 2023

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