Unconsolidated Investments - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($) property fund joint_venture	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Payments to joint venture	$ 95.0
Proceeds from equity method investments	81.7
Interest income recognized	4.3
Non-cash contributions	49.8
Income (loss) from unconsolidated investments, other	15.3
Unconsolidated investments	$ 2,174.7		$ 2,093.7
Number of joint ventures with unfulfilled capital commitments | joint_venture	8
Increase (Decrease) in Accrued Liabilities	$ 26.1	$ 28.0
Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Unfunded capital commitments	241.0
Equity Method Investments Closed-End Funds
Schedule of Equity Method Investments [Line Items]
Unfunded capital commitments	$ 74.7
Number of closed-end funds | fund	4
Recurring
Schedule of Equity Method Investments [Line Items]
Unconsolidated investments	$ 2,174.7		2,093.7
Fund VI
Schedule of Equity Method Investments [Line Items]
Number of real estate properties sold | property	1
Multifamily Properties In Separate Account Platforms
Schedule of Equity Method Investments [Line Items]
Number of real estate properties sold | property	1
Vintage Housing Holdings
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 290.5		$ 272.3
Joint Venture | Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Increase (Decrease) in Accrued Liabilities		$ (18.5)
Minimum | Various Comingled Funds And Separate Accounts
Schedule of Equity Method Investments [Line Items]
Ownership percentage (as a percent)	5.00%
Maximum | Various Comingled Funds And Separate Accounts
Schedule of Equity Method Investments [Line Items]
Ownership percentage (as a percent)	50.00%