Real Estate Investments - Dispositions (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		0 Months Ended							9 Months Ended
	Sep. 30, 2014 sqft	Sep. 30, 2014 Real Estate Dispositions [Member] sqft	Apr. 11, 2014 Real Estate Dispositions [Member] Medical Building Disposed April 11 2014 [Member] FLORIDA sqft		Apr. 23, 2014 Real Estate Dispositions [Member] Medical Building Disposed April 23 2014 [Member] TEXAS sqft		Sep. 12, 2014 Real Estate Dispositions [Member] Medical Building Disposed September 12, 2014 [Member] NEVADA	Sep. 30, 2014 Real Estate Dispositions [Member] Medical Building Disposed September 12, 2014 [Member] NEVADA	Sep. 12, 2014 Real Estate Dispositions [Member] Medical Building Disposed September 12, 2014 [Member] NEVADA sqft	Sep. 30, 2014 Mortgage Note Repayments [Member]
Acquisitions and Dispositions [Line Items]
Sales Price	$ 8.5	$ 8.5	$ 1.8	[1]	$ 4.4	[1]			$ 2.3
Closing Adjustments	(0.5)	(0.5)	(0.1)	[1]	(0.2)	[1]			(0.2)
Company-financed Mortgage Notes	3.0	(1.9)						(1.9)	(1.9)	4.9
Net Proceeds	11.0	6.1	1.7	[1]	4.2	[1]	0.2			4.9
Net Real Estate Investment	10.7	10.7	1.7	[1]	4.1	[1]			4.9
Other (including receivables)	0.1	0.1			0.1	[1]
Gain/(Impairment)	$ (2.8)	$ (2.8)					$ (2.8)
Square Footage	141,999	141,999	52,608	[1]	58,365	[1]			31,026

[1] Previously included in assets held for sale.