Real Estate Investments - Acquisitions (Details) (Real Estate Acquisitions [Member], USD $) In Millions, unless otherwise specified	9 Months Ended	0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		1 Months Ended			0 Months Ended
	Sep. 30, 2014 sqft	Mar. 28, 2014 IOWA	Mar. 28, 2014 IOWA sqft	May 22, 2014 OKLAHOMA	May 22, 2014 OKLAHOMA sqft	Jun. 04, 2014 TEXAS	Jun. 04, 2014 TEXAS sqft	Jun. 06, 2014 NORTH CAROLINA	Jun. 06, 2014 NORTH CAROLINA sqft	Jul. 28, 2014 MINNESOTA		Jul. 31, 2014 MINNESOTA	Jul. 28, 2014 MINNESOTA sqft		Sep. 16, 2014 FLORIDA	Sep. 16, 2014 FLORIDA sqft
Business Acquisition [Line Items]
Purchase Price	$ 128.3	$ 0		$ 85.4		$ 8.7		$ 6.5		$ 19.8	[1]				$ 7.9
Elimination of Mortgage Note Receivable	(121.2)	(40.0)		(81.2)
Mortgage Notes Payable Assumed	(11.4)									(11.4)	[1]
Cash Consideration	35.8			4.2		8.8		6.5		8.4	[1]				7.9
Real Estate	169.8		40.2		85.4		8.8		6.5				21.0	[1]		7.9
Other	(1.4)		(0.2)										(1.2)	[1]
Square Footage	544,433		152,655		200,000		48,048		35,292				60,476			47,962
Fair value adjustment premium										$ 1.2		$ 1.2

[1] The mortgage note payable assumed in the acquisition does not reflect the fair value adjustment of $1.2 million recorded by the Company upon acquisition (included in Other).