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Summary Of Significant Accounting Policies Impacts of COVID-19 Pandemic (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue Recognition and Accounts Receivable [Abstract]        
Collectibility adjustment $ 0.6 $ 29.4 $ 21.8 $ 87.6
Tenants with revenue recognized on a cash basis method 35.00%   35.00%