Segment Information Building Acquisitions and Dispositions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014 bldg	Sep. 30, 2014 bldg
Land, Buildings and Improvements [Member]
Acquisitions [Abstract]
Number of real estate properties acquired	1	9
Total purchase price	$ 6.8	$ 97.7
Dispositions [Abstract]
Proceeds from Sale of Property		366.9
Number of Real Estate Properties Sold	0	52
Land [Member]
Dispositions [Abstract]
Acres of land sold	19	19
Liberty Venture I, LP [Member]
Dispositions [Abstract]
Equity Method Investment, Ownership Percentage	25.00%	25.00%
Liberty Venture I, LP [Member] \| Equity Method Investee [Member] \| Land, Buildings and Improvements [Member]
Dispositions [Abstract]
Proceeds from Sale of Property		$ 32.2
Number of Real Estate Properties Sold		3

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- Definition

Number of real estate properties acquired

+ References

No definition available.

+ Details

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- Definition

Number of Real Estate Properties Sold

+ References

No definition available.

+ Details

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- Definition

Area of land held.

+ References

No definition available.

+ Details

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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