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Note 7 - Investments In and Advances to Real Estate Joint Ventures - Joint Venture Investments Accounted for Under the Equity Method, Debt Details (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Mortgage and notes payable |  | $ 1,594.1 | $ 1,782.6
Prudential Investment Program [Member] |  |  |
Mortgage and notes payable |  | $ 538.1 | $ 572.6
Weighted average interest rate |  | 3.46% | 4.29%
Weighted average remaining term (Year) | [1] | 46 years 9 months 18 days | 49 years
KIR [Member] |  |  |
Mortgage and notes payable |  | $ 556.0 | $ 651.4
Weighted average interest rate |  | 4.39% | 4.43%
Weighted average remaining term (Year) | [1] | 28 months 12 days | 40 months 12 days
CPP [Member] |  |  |
Mortgage and notes payable |  | $ 84.8 | $ 84.4
Weighted average interest rate |  | 3.25% | 3.85%
Weighted average remaining term (Year) | [1] | 42 months | 54 months
Other Joint Venture Programs [Member] |  |  |
Mortgage and notes payable |  | $ 415.2 | $ 474.2
Weighted average interest rate |  | 3.87% | 4.26%
Weighted average remaining term (Year) | [1] | 80 months 27 days | 78 months 18 days
[1] | Average remaining term includes extensions

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