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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Carrying Value |  | $ 3,224.9 |  | $ 2,524.1 |  |
Fixed rate notes payable |  |  |  |  |  |
Carrying Value |  | 3,125.1 |  | 2,380.4 |  |
Estimated Fair Value |  | 3,455.3 |  | 2,533.5 |  |
Floating rate notes payable (1) |  |  |  |  |  |
Carrying Value |  | 99.8 | [1] | 143.7 | [1] | $ 99.6
Estimated Fair Value | [1] | $ 99.0 |  | $ 143.8 |  |
[1] | Includes balances outstanding under our unsecured credit facility at December 31, 2019.

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