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Note 5 - Dispositions of Real Estate and Assets Held-for-sale - Disposition Activity (Details) - Disposition Activity Relating to Consolidated Operating Properties and Parcels [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) | [1] | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Aggregate sales price/gross fair value | $ 344.7 | $ 1,164.3 | $ 352.2
Gain on sale of operating properties/change in control of interests | $ 79.2 | $ 229.8 | $ 93.5
Number of operating properties sold/deconsolidated | 20 | 54 | 25
Number of out-parcels sold | 9 | 7 | 9
[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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