UNCONSOLIDATED INVESTMENTS - Cash Distributions by Investment Type and Location (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Operating	$ 78.1
Investing	157.1
Multifamily
Schedule of Equity Method Investments [Line Items]
Operating	46.8
Investing	105.2
Commercial
Schedule of Equity Method Investments [Line Items]
Operating	20.2
Investing	1.5
Funds
Schedule of Equity Method Investments [Line Items]
Operating	10.2
Investing	15.6
Residential and Other
Schedule of Equity Method Investments [Line Items]
Operating	0.9
Investing	34.8
Western U.S.
Schedule of Equity Method Investments [Line Items]
Operating	60.4
Investing	101.0
Western U.S. | Multifamily
Schedule of Equity Method Investments [Line Items]
Operating	38.8
Investing	66.6
Western U.S. | Commercial
Schedule of Equity Method Investments [Line Items]
Operating	11.2
Investing	0.2
Western U.S. | Funds
Schedule of Equity Method Investments [Line Items]
Operating	10.2
Investing	10.7
Western U.S. | Residential and Other
Schedule of Equity Method Investments [Line Items]
Operating	0.2
Investing	23.5
Ireland
Schedule of Equity Method Investments [Line Items]
Operating	15.3
Investing	43.5
Ireland | Multifamily
Schedule of Equity Method Investments [Line Items]
Operating	8.0
Investing	38.6
Ireland | Commercial
Schedule of Equity Method Investments [Line Items]
Operating	7.3
Investing	0.0
Ireland | Funds
Schedule of Equity Method Investments [Line Items]
Operating	0.0
Investing	4.9
Ireland | Residential and Other
Schedule of Equity Method Investments [Line Items]
Operating	0.0
Investing	0.0
United Kingdom
Schedule of Equity Method Investments [Line Items]
Operating	2.4
Investing	12.6
United Kingdom | Multifamily
Schedule of Equity Method Investments [Line Items]
Operating	0.0
Investing	0.0
United Kingdom | Commercial
Schedule of Equity Method Investments [Line Items]
Operating	1.7
Investing	1.3
United Kingdom | Funds
Schedule of Equity Method Investments [Line Items]
Operating	0.0
Investing	0.0
United Kingdom | Residential and Other
Schedule of Equity Method Investments [Line Items]
Operating	0.7
Investing	$ 11.3