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Note 5 - Dispositions of Real Estate - Disposition Activity (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | [1] | Dec. 31, 2018 USD ($)
Gain on sale of properties/change in control of interests | $ 6.5 | $ 79.2 | $ 229.8
Disposition Activity Relating to Consolidated Operating Properties and Parcels [Member] |  |  |
Aggregate sales price/gross fair value | $ 31.8 | $ 344.7 | $ 1,164.3
Number of operating properties sold/deconsolidated | 3 | 20 | 54
Number of parcels sold | 4 | 9 | 7
[1] | Includes the land parcel sale at Dania Pointe, noted above in Footnote 4 of the Notes to Consolidated Financial Statements.

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