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Real Estate (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Real Estate Tenant Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for doubtful accounts receivable | $ 0.1 | $ 1.2

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