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Note 5 - Dispositions of Real Estate and Assets Held-for-sale (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Disposed Operating Properties and Out-parcels [Member]      
Aggregate sales price $ 352.2 $ 378.7 $ 492.5
Gain on sale, net of tax 93.5 86.8 143.6
Impairment charges $ 17.1 $ 37.2 $ 10.2
Disposed Operating Properties [Member]      
Number of properties 25 30 89
Disposed Out-parcels [Member]      
Number of properties 9 2 8