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Real Estate Dispositions (Details Textuals) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended12 Months Ended
Sep. 30, 2011
Property
Market
Sep. 30, 2010
Sep. 30, 2011
PartnershipUnit
Property
Market
Sep. 30, 2010
Property
Dec. 31, 2010
Property
Gain on Dispositions of Unconsolidated Real Estate and Other (Textuals) [Abstract]     
Number of properties classified as held for sale0 0 39
Number of units in properties classified as held for sale0 0 6,701
Number of consolidated properties disposed  393151
Number of units in consolidated properties disposed  6,7015,0488,189
Prepayment penalties treated as reduction of gain upon repayment of property loans collateralized by properties sold$ 2.6$ 0.6$ 7.6$ 3.8 
Goodwill related to conventional and affordable segments allocated to carrying amounts of properties sold or classified as held for sale1.00.52.73.3 
Amount of allocated goodwill reducing gain on dispositions of real estate for properties sold or classified as held for sale0.9 2.2  
Amount of allocated goodwill treated as an adjustment of impairment losses for properties sold or classified as held for sale0.1 0.5  
Reduction of gain on dispositions of real estate 0.3 2.9 
Reduction of gain on dispositions of real estate adjustment of impairment losses 0.2 0.4 
Non-recourse property debt assumed in connection with real estate dispositions  $ 95.4$ 120.9