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Note 5 - Dispositions of Real Estate and Assets Held-for-sale (Details Textual) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
Equity Method Investments | $ 570.9 | $ 578.1 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |
Proceeds from Sale of Real Estate, Total | 9.7 |  |
Gains (Losses) on Sales of Investment Real Estate | $ 6.3 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Consolidated Operating Properties [Member] |  |  |
Number of Properties Disposed of | 10 |  |
Investment in Unconsolidated Property, Unconsolidated 2017 [Member] |  |  |
Equity Method Investments | $ 62.4 |  | $ 62.4
Equity Method Investment, Ownership Percentage | 54.80% |  |
Gain on Sale of Operating Properties/ Change in Controls of Interests [Member] | Accounting Standards Update 2017-05 [Member] |  |  |
Deconsolidation, Gain (Loss), Amount | $ 6.8 |  |
Non-recouse Mortgage Debt Related to Property Deconsolidated [Member] |  |  |
Debt Instrument, Increase (Decrease), Net, Total | 206.0 |  |
Sold Portion of Investment in Consolidated Operating Property [Member] |  |  |
Disposal Group, Including Discontinued Operation, Consideration | 320.0 |  |
Noncontrolling Interest, Decrease from Deconsolidation | $ 43.8 |  |

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