Note 17 - Pro Forma Financial Information (Details) - Pro Forma Financial Information (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013
Pro Forma Financial Information [Abstract]
Revenues from rental property	$ 508.6	$ 472.0
Net income	156.2	158.4
Net income available to the Company’s common shareholders	$ 123.1	$ 125.2
Net income available to the Company’s common shareholders per common share:
Basic (in Dollars per share)	$ 0.30	$ 0.31
Diluted (in Dollars per share)	$ 0.30	$ 0.30

No authoritative reference available.

No definition available.

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- Definition

Pro forma basic earnings per share or earnings per unit, which is commonly presented in initial public offerings based on the terms of the offering.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph b

-Subparagraph 7

-Article 11

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

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Pro forma diluted earnings per share, which is commonly presented in initial public offerings.

+ References

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