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UNCONSOLIDATED INVESTMENTS - Joint Venture Holdings (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures $ 1,334.6 $ 859.9  
Non-cash contribution to acquire interest in joint venture 125.5    
Proceeds from equity method investments 189.1    
Interest income recognized 179.7 78.7 $ 77.8
Fair value of unconsolidated investments 1,107.4 662.6  
Multifamily [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 609.2 400.6  
Commercial [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 266.2 92.1  
Development [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 72.8 70.9  
Funds [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 139.6 102.5  
Residential and Other [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures $ 246.8 193.8  
Minimum [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 5.00%    
Maximum [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 50.00%    
Fair Value, Recurring [Member]      
Schedule of Equity Method Investments [Line Items]      
Fair value of unconsolidated investments $ 1,107.4 662.2  
Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Payments to joint venture 266.0    
Non-cash contribution to acquire interest in joint venture 218.0    
Western United States [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 767.8 598.3  
Western United States [Member] | Multifamily [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 230.5 184.1  
Western United States [Member] | Commercial [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 78.1 47.0  
Western United States [Member] | Development [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 72.8 70.9  
Western United States [Member] | Funds [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 139.6 102.5  
Western United States [Member] | Residential and Other [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 246.8 193.8  
Ireland [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 518.1 251.7  
Ireland [Member] | Multifamily [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 378.7 216.5  
Ireland [Member] | Commercial [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 139.4 35.2  
Ireland [Member] | Development [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 0.0  
Ireland [Member] | Funds [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 0.0 0.0  
Ireland [Member] | Residential and Other [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 0.0 0.0  
United Kingdom [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 48.7 9.9  
United Kingdom [Member] | Multifamily [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 0.0 0.0  
United Kingdom [Member] | Commercial [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 48.7 9.9  
United Kingdom [Member] | Development [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 0.0  
United Kingdom [Member] | Funds [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures 0.0 0.0  
United Kingdom [Member] | Residential and Other [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures $ 0.0 $ 0.0