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Investments in Real Estate (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Building sqft	Sep. 30, 2011 Building sqft	Sep. 30, 2012 Building sqft	Sep. 30, 2011 Building sqft
Investments in Real Estate (Textual) [Abstract]
Total aggregate initial investment	$ 75.6	$ 16.9	$ 150.4	$ 78.6
Investments in Real Estate (Additional Textual) [Abstract]
Number of industrial buildings	9	2	16	8
Square feet	577,261	112,808	1,353,159	647,886
Revenues	1.2		3.1
Net income	0.6		1.3
Land [Member]
Investments in Real Estate (Textual) [Abstract]
Total aggregate initial investment	35.8	8.8	73.0	39.6
Building and improvements [Member]
Investments in Real Estate (Textual) [Abstract]
Total aggregate initial investment	34.6	6.8	68.9	34.9
Intangible assets [Member]
Investments in Real Estate (Textual) [Abstract]
Total aggregate initial investment	5.2	1.3	8.5	4.1
Intangible liabilities [Member]
Investments in Real Estate (Textual) [Abstract]
Total aggregate initial investment	$ 1.2		$ 1.4