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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Carrying Value | [1] | $ 3,168.5 | $ 3,166.6 |
Fixed rate notes payable |  |  |  |
Carrying Value |  | 3,128.7 | 3,126.9 |
Estimated Fair Value |  | 3,335.3 | 3,519.9 |
Floating rate notes payable (1) |  |  |  |
Carrying Value |  | 39.8 | 39.7 | $ 99.8
Estimated Fair Value |  | $ 40.1 | $ 40.0 |
[1] | Unamortized debt discounts and debt issuance costs of $21.5 million and $23.4 million are included in senior unsecured notes payable as of June 30, 2021 and December 31, 2020, respectively.

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