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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.