Real Estate Investments - Acquisitions (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	1 Months Ended		1 Months Ended						3 Months Ended	1 Months Ended
	Sep. 30, 2013 Real Estate Acquisitions sqft	Jan. 31, 2013 TENNESSEE Real Estate Acquisitions Tenant sqft	Oct. 31, 2012 TENNESSEE Real Estate Acquisitions sqft	Apr. 30, 2013 TEXAS Real Estate Acquisitions Tenant sqft	Aug. 31, 2013 INDIANA Real Estate Acquisitions sqft	Sep. 30, 2013 COLORADO Real Estate Acquisitions sqft		Sep. 30, 2013 MISSOURI Real Estate Acquisitions sqft	Sep. 30, 2013 MISSOURI Additional Funding	Sep. 30, 2013 MISSOURI Mortgage Note Financing [Member]	Oct. 31, 2013 Subsequent Event COLORADO Real Estate Acquisitions Tenant sqft	Oct. 31, 2013 Subsequent Event WASHINGTON Real Estate Acquisitions sqft	Oct. 31, 2013 Subsequent Event NORTH CAROLINA Real Estate Acquisitions sqft	Aug. 31, 2013 St Joseph's Medical Center INDIANA Real Estate Acquisitions	Sep. 30, 2013 Poudre Valley Health System COLORADO Real Estate Acquisitions
Acquisitions and Dispositions [Line Items]
Operating Leases, Income Statement, Lease Revenue										$ 0.1
Number of tenants occupying building		4		1							3
Interest rate on mortgages assumed						6.17%						6.01%	5.86%
Percentage of Property Leased		100.00%		100.00%	87.00%	100.00%		100.00%			83.00%	100.00%	100.00%	48.00%	71.00%
Fair value adjustment premium on liabilities assumed						0.7
Commitment to fund									6.0
Date Acquired		Jan. 29, 2013		Apr. 08, 2013	Aug. 08, 2013	Sep. 27, 2013	[1]	Sep. 27, 2013
Purchase Price	212.6	16.2		16.3	44.3	33.2	[1]	102.6			21.6	34.9	20.3
Construction Mortgage Note Receivable Repayments	97.2							97.2	2.8
Mortgage Notes Payable Assumed	(12.0)					(12.0)	[1]					(16.6)	(11.2)
Cash Consideration	103.4	16.2		16.3	44.3	21.2	[1]	5.4
Real estate	210.8	15.7		16.3	43.3	32.9	[1]	102.6
Other	$ 1.8	$ 0.5			$ 1.0	$ 0.3	[1]	$ 0
Square footage	566,578	52,225	39,345	42,627	205,573	80,153	[1]	186,000			70,138	81,717	90,633

[1] The mortgage note payable assumed in the acquisition does not reflect the fair value adjustment of $0.7 million recorded by the Company upon acquisition (included in Other).