Accounts Receivable/Deferred Rent Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts Receivable and Deferred Rent Receivable [Abstract]
Allowance for Doubtful Accounts Receivable	$ 6.9	$ 7.4
Provision for Doubtful Accounts	$ 2.0	$ 1.7	$ 1.8