UNCONSOLIDATED INVESTMENTS - Schedule of Joint Venture Cash Distributions by Investment Type and Geographic Location (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Schedule of Equity Method Investments [Line Items]
Operating	$ 31.2
Investing	167.3	$ 4.8
Western U.S.
Schedule of Equity Method Investments [Line Items]
Operating	24.0
Investing	159.9
Ireland
Schedule of Equity Method Investments [Line Items]
Operating	5.6
Investing	0.1
United Kingdom
Schedule of Equity Method Investments [Line Items]
Operating	1.6
Investing	7.3
Multifamily
Schedule of Equity Method Investments [Line Items]
Operating	21.6
Investing	27.7
Multifamily | Western U.S.
Schedule of Equity Method Investments [Line Items]
Operating	18.6
Investing	27.6
Multifamily | Ireland
Schedule of Equity Method Investments [Line Items]
Operating	3.0
Investing	0.1
Multifamily | United Kingdom
Schedule of Equity Method Investments [Line Items]
Operating	0.0
Investing	0.0
Commercial
Schedule of Equity Method Investments [Line Items]
Operating	7.1
Investing	0.0
Commercial | Western U.S.
Schedule of Equity Method Investments [Line Items]
Operating	4.5
Investing	0.0
Commercial | Ireland
Schedule of Equity Method Investments [Line Items]
Operating	2.6
Investing	0.0
Commercial | United Kingdom
Schedule of Equity Method Investments [Line Items]
Operating
Investing	0.0
Funds
Schedule of Equity Method Investments [Line Items]
Operating	1.4
Investing	1.1
Funds | Western U.S.
Schedule of Equity Method Investments [Line Items]
Operating	0.3
Investing	1.1
Funds | Ireland
Schedule of Equity Method Investments [Line Items]
Operating	0.0
Investing	0.0
Funds | United Kingdom
Schedule of Equity Method Investments [Line Items]
Operating	1.1
Investing	0.0
Residential, Hotel and Other
Schedule of Equity Method Investments [Line Items]
Operating	1.1
Investing	138.5
Residential, Hotel and Other | Western U.S.
Schedule of Equity Method Investments [Line Items]
Operating	0.6
Investing	131.2
Residential, Hotel and Other | Ireland
Schedule of Equity Method Investments [Line Items]
Operating	0.0
Investing	0.0
Residential, Hotel and Other | United Kingdom
Schedule of Equity Method Investments [Line Items]
Operating	0.5
Investing	$ 7.3