Components Of Rental Income (Schedule Of Minimum Rent) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Minimum Rent [Line Items]
Straight-line rents	$ 1.9	$ 3.6
Amortization of above market leases
Minimum Rent [Line Items]
Amortization of above and below market leases	(1.7)	(1.4)
Amortization of below market leases
Minimum Rent [Line Items]
Amortization of above and below market leases	$ 2.5	$ 2.5