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Note 3 - Operating Property Activities - Disposition Activity (Details) - Disposition Activity Relating to Consolidated Operating Properties and Parcels [Member] $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Aggregate sales price	$ 833.1	$ 157.3
Gain on sale of operating properties/change in control of interests	152.2	21.6
Impairment charges	$ 9.9	$ 2.4
Number of operating properties sold/deconsolidated	35	11
Number of out-parcels sold	2	5

X

- Definition

The number of out-parcels sold during the period.

+ References

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- Definition

The number of properties sold during the period.

+ References

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X

- Definition

Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

+ References

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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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