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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Carrying Value [1] $ 3,451.8 $ 3,715.4
Fixed rate notes payable    
Carrying Value 2,763.8 2,866.9
Estimated Fair Value 2,606.9 2,651.6
Floating rate notes payable (1)    
Carrying Value [2] 688.0 848.5
Estimated Fair Value [2] $ 706.9 $ 864.9
[1] Balances are decreased by unamortized debt discounts, debt issuance costs, and fair market value adjustments, net of $7.1 million and $5.5 million as of September 30, 2024 and December 31, 2023, respectively.
[2] Includes the senior unsecured notes payable due in 2026 at September 30, 2024 and December 31, 2023