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Leases - Tenant Accounts Receivable (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Lease Security Deposits Available in Letters of Credit $ 28.9   $ 32.9
Lease security deposits in restricted cash 0.7   0.7
Lease security deposits included in tenant prepaid rent and security deposits on the Balance Sheet 15.9   15.2
Real Estate Taxes, Tenant Responsibility 5.4 $ 5.1  
Accrued Income Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Deferred Rent Receivables, Net $ 80.2   $ 75.8