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Summary of Significant Accounting Policies (Revenue Recognition) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018
Real Estate Tenant Receivables |  |
Financing Receivable, Impaired [Line Items] |  |
Allowance for doubtful accounts receivable | $ 1.3 | $ 1.5
Deferred Operating Lease |  |
Financing Receivable, Impaired [Line Items] |  |
Allowance for doubtful accounts receivable | 1.3 | $ 1.8
Real Estate Sales | Lennar |  |
Financing Receivable, Impaired [Line Items] |  |
Interest income from settlement of real estate tax reimbursements | $ 123.4 |

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