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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Carrying Value [1] $ 3,167.6 $ 3,166.6  
Fixed rate notes payable      
Carrying Value 3,127.8 3,126.9  
Estimated Fair Value 3,346.7 3,519.9  
Floating rate notes payable (1)      
Carrying Value 39.8 39.7 $ 225.8
Estimated Fair Value $ 40.1 $ 40.0  
[1] Unamortized debt discounts and debt issuance costs of $22.4 million and $23.4 million are included in senior unsecured notes payable as of March 31, 2021 and December 31, 2020, respectively.