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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | ---
Carrying Value | [1] | $ 3,671.3 |  | $ 3,170.4 |
Fixed rate notes payable |  |  |  |  |
Carrying Value |  | 3,131.4 |  | 3,130.5 |
Estimated Fair Value |  | 3,122.8 |  | 3,363.7 |
Floating rate notes payable (1) |  |  |  |  |
Carrying Value |  | 539.9 | [2] | 39.9 | $ 39.8
Estimated Fair Value |  | $ 540.4 | [2] | $ 40.1 |
[1] | Unamortized debt discounts and debt issuance costs of $18.7 million and $19.6 million are included in senior unsecured notes payable as of March 31, 2022 and December 31, 2021, respectively.
[2] | Includes balance outstanding under our unsecured credit facility at March 31, 2022.

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