Components of Rental Income and Expense (Schedule Of Minimum Rent) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components Of Rental Income and Expense [Abstract]
Straight-line rents	$ 8.1	$ 7.6	$ 5.1
Net amortization of above and below market leases	$ 1.8	$ 2.7	$ 2.4