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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Carrying Value | [1] | $ 3,735.7 | $ 3,485.6
Fixed rate notes payable |  |  |
Carrying Value |  | 2,765.0 | 2,764.4
Estimated Fair Value |  | 2,567.7 | 2,528.6
Floating rate notes payable (1) |  |  |
Carrying Value | [2] | 970.7 | 721.2
Estimated Fair Value | [2] | $ 981.2 | $ 733.0
[1] | Balances are decreased by unamortized debt discounts, debt issuance costs, and fair market value adjustments, net of $11.0 million and $13.3 million as of March 31, 2025 and December 31, 2024, respectively.
[2] | Includes the senior unsecured notes payable and a term loan due in 2026 at March 31, 2025 and December 31, 2024, and includes commercial paper notes at March 31, 2025 and balances outstanding under our unsecured revolving credit facility at December 31, 2024.

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