UNCONSOLIDATED INVESTMENTS - Additional Information (Details) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 06, 2025 USD ($)	Sep. 30, 2025 USD ($) property unit fund	Sep. 30, 2024 USD ($) fund	Sep. 30, 2025 USD ($) property unit jointVenture fund	Sep. 30, 2024 USD ($) fund	Dec. 31, 2024 USD ($)
Schedule of Equity Method Investments [Line Items]
Distributions from unconsolidated investments				$ 358.3
Contributions to unconsolidated investments				108.2
Loss from unconsolidated investments				45.7
Increase related to foreign exchange movements				52.4
Increase related to other items				16.6
Increase in unconsolidated investments				14.4
Fair value of lots		$ 951.9		951.9		$ 979.6
Unconsolidated investments		1,697.7		1,697.7		1,884.4
Net proceeds from sale of consolidated real estate				454.7	$ 457.6
Gain on sale of properties				65.4	112.8
Increase (decrease) from unconsolidated investments - carried interests		8.8	$ (16.4)	(1.4)	(45.1)
Net accrued carried interests receivable		26.3	32.2	26.3	32.2	27.6
Distributions				49.8
Equity income pickup		34.5	(20.3)	$ 45.7	(45.1)
Number of joint ventures with unfulfilled capital commitments | jointVenture				8
Funds
Schedule of Equity Method Investments [Line Items]
Increase (decrease) from unconsolidated investments - carried interests		0.1	(9.3)	$ (5.4)	(34.9)
Distributions				1.6
Co-investments
Schedule of Equity Method Investments [Line Items]
Increase (decrease) from unconsolidated investments - carried interests		8.7	$ (7.1)	4.0	(10.2)
Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Unfunded capital commitments		212.4		212.4
Equity Method Investments Closed-End Funds
Schedule of Equity Method Investments [Line Items]
Unfunded capital commitments		33.5		33.5
Recurring
Schedule of Equity Method Investments [Line Items]
Unconsolidated investments		$ 1,697.7		1,697.7		$ 1,884.4
Western U.S.
Schedule of Equity Method Investments [Line Items]
Distributions				36.4
Western U.S. | Funds
Schedule of Equity Method Investments [Line Items]
Distributions				$ 0.4
Multifamily
Schedule of Equity Method Investments [Line Items]
Number of real estate properties | property		9		9
Reduction of a multifamily joint venture				$ 17.4
Percentage of ownership from recapitalization		10.00%		10.00%		51.00%
Number of units in operating properties (in units) | unit		2,809		2,809
Net proceeds from sale of consolidated real estate				$ 39.5
Gain on sale of properties				$ 32.2	$ 8.1
Multifamily | Western U.S.
Schedule of Equity Method Investments [Line Items]
Number of real estate properties | property		9		9
Percentage of ownership from recapitalization		51.00%		51.00%		10.00%
Multifamily | Southern California
Schedule of Equity Method Investments [Line Items]
Percentage of ownership from recapitalization		10.00%		10.00%		51.00%
Number of units in operating properties (in units) | unit		687		687
Gain on sale of properties				$ 17.1
Multifamily | Southern California | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Net proceeds from sale of consolidated real estate	$ 17.0
Fully-owned lots
Schedule of Equity Method Investments [Line Items]
Number of real estate properties | property		3		3
Fair value of lots		$ 20.0		$ 20.0
Gain on sale of properties				$ 3.5
Various Comingled Funds And Separate Accounts | Minimum
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage		5.00%		5.00%
Various Comingled Funds And Separate Accounts | Maximum
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage		50.00%		50.00%
Joint Venture | Western U.S.
Schedule of Equity Method Investments [Line Items]
Number of commingled funds | fund		1	1	1	1
VHH
Schedule of Equity Method Investments [Line Items]
Carrying value of investment		$ 362.8		$ 362.8		$ 333.9
Distributions				8.4
Equity income pickup				36.4
Fair value adjustments				$ 28.0
Number of investment units | unit		12,995		12,995
Number of investment units under development | unit		1,960		1,960