Note 4 - Investment and Advances in Real Estate Joint Ventures (Details) - Joint Venture Investments Accounted for under the Equity Method - Investment Details $ in Millions		Sep. 30, 2015 USD ($) ft²	Dec. 31, 2014 USD ($) ft²
Schedule of Equity Method Investments [Line Items]
Total GLA (in Square Feet) | ft²	[1]	6,292
KimPru and KimPru II [Member]
Schedule of Equity Method Investments [Line Items]
Average Ownership Interest	[2],[3]	15.00%	15.00%
Number of Properties	[2],[3]	55	60
Total GLA (in Square Feet) | ft²	[2],[3]	9,900,000	10,600,000
Gross Investment In Real Estate	[2],[3]	$ 2,596.9	$ 2,728.9
The Company's Investment	[2],[3]	$ 176.4	$ 178.6
Kimco Income Fund [Member]
Schedule of Equity Method Investments [Line Items]
Average Ownership Interest	[2]	48.60%	48.60%
Number of Properties	[2]	50	54
Total GLA (in Square Feet) | ft²	[2]	10,900,000	11,500,000
Gross Investment In Real Estate	[2]	$ 1,428.5	$ 1,488.2
The Company's Investment	[2]	$ 135.5	$ 152.1
Kimstone [Member]
Schedule of Equity Method Investments [Line Items]
Average Ownership Interest	[2],[4]		33.30%
Number of Properties	[2],[4]		39
Total GLA (in Square Feet) | ft²	[2],[4]		5,600,000
Gross Investment In Real Estate	[2],[4]		$ 1,098.7
The Company's Investment	[2],[4]		$ 98.1
BIG Shopping Centers [Member]
Schedule of Equity Method Investments [Line Items]
Average Ownership Interest	[2]	50.10%	50.10%
Number of Properties	[2]	5	6
Total GLA (in Square Feet) | ft²	[2]	900,000	1,000,000
Gross Investment In Real Estate	[2]	$ 121.9	$ 151.6
The Company's Investment	[2]
CPP [Member]
Schedule of Equity Method Investments [Line Items]
Average Ownership Interest	[2]	55.00%	55.00%
Number of Properties	[2]	7	7
Total GLA (in Square Feet) | ft²	[2]	2,400,000	2,400,000
Gross Investment In Real Estate	[2]	$ 518.8	$ 504.0
The Company's Investment	[2]	$ 194.4	$ 188.9
Other Institutional Programs [Member]
Schedule of Equity Method Investments [Line Items]
Average Ownership Interest	[2]
Number of Properties	[2]	53	53
Total GLA (in Square Feet) | ft²	[2]	1,800,000	1,800,000
Gross Investment In Real Estate	[2]	$ 414.2	$ 413.8
The Company's Investment	[2]	$ 18.9	$ 11.0
RioCan [Member]
Schedule of Equity Method Investments [Line Items]
Average Ownership Interest		50.00%	50.00%
Number of Properties		41	45
Total GLA (in Square Feet) | ft²		8,500,000	9,300,000
Gross Investment In Real Estate		$ 955.2	$ 1,205.8
The Company's Investment		$ 121.3	$ 159.8
Latin America Portfolio [Member]
Schedule of Equity Method Investments [Line Items]
Number of Properties		9	13
Total GLA (in Square Feet) | ft²			100,000
Gross Investment In Real Estate		$ 57.7	$ 91.2
The Company's Investment		$ 15.3	$ 24.4
Other Joint Venture Programs [Member]
Schedule of Equity Method Investments [Line Items]
Number of Properties		53	60
Total GLA (in Square Feet) | ft²		8,700,000	9,500,000
Gross Investment In Real Estate		$ 1,180.6	$ 1,401.2
The Company's Investment		$ 171.9	$ 224.3
All Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Number of Properties		273	337
Total GLA (in Square Feet) | ft²		43,100,000	51,800,000
Gross Investment In Real Estate		$ 7,273.8	$ 9,083.4
The Company's Investment		$ 833.7	$ 1,037.2

[1] Gross leasable area ("GLA")

[2] The Company manages these joint venture investments and, where applicable, earns acquisition fees, leasing commissions, property management fees, assetmanagement fees and construction management fees.

[3] This venture represents four separate joint ventures, with four separate accounts managed by Prudential Real Estate Investors ("PREI"), three of these ventures are collectively referred to as KimPru and the remaining venture is referred to as KimPru II.

[4] During the nine months ended September 30, 2015, the Company purchased the remaining 66.7% interest in the 39-property Kimstone portfolio from Blackstone for a gross purchase price of $1.4 billion, including the assumption of $638.0 million in mortgage debt.