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Note 7 - Investment and Advances in Real Estate Joint Ventures (Details) - Summarized Financial Information for RioCan - Income Statements (RioCan [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
RioCan [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Revenues from rental properties | $ 202.5 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | $ 209.9 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | $ 213.3 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember
Operating expenses | (74.6)kim_EquityMethodInvestmentOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | (76.9)kim_EquityMethodInvestmentOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | (78.1)kim_EquityMethodInvestmentOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember
Interest expense | (31.9)kim_EquityMethodInvestmentInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | (40.1)kim_EquityMethodInvestmentInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | (51.9)kim_EquityMethodInvestmentInterestExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember
Depreciation and amortization | (33.5)kim_EquityMethodInvestmentDepreciationAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | (36.0)kim_EquityMethodInvestmentDepreciationAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | (37.3)kim_EquityMethodInvestmentDepreciationAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember
Other (expense)/income, net | (1.3)kim_EquityMethodInvestmentOtherIncomeExpenseNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | (1.8)kim_EquityMethodInvestmentOtherIncomeExpenseNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | 14.7 kim_EquityMethodInvestmentOtherIncomeExpenseNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember
| (141.3)kim_EquityMethodInvestmentCostsAndExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | (154.8)kim_EquityMethodInvestmentCostsAndExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | (152.6)kim_EquityMethodInvestmentCostsAndExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember
Net income | $ 61.2 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | $ 55.1 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember | $ 60.7 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kim_RioCanMember

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