Assets and Liabilities Measured at Fair Value on a Recurring Basis - Schedule of fair value assets and liabilities measured on recurring basis (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties	$ 19,191.3	$ 20,444.0
Real estate operating business	653.6	641.9
Marketable securities:
Marketable securities excluding Real estate-related	639.3	2,030.2
Total investments (cost: $23,771.3 and $24,897.0)	29,083.9	32,601.7
Loans payable	(1,847.3)	(2,069.7)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties	19,191.3	20,444.0
Real estate joint ventures	6,341.5	7,103.6
Real estate funds	892.7	893.4
Real estate operating business	653.6	641.9
Marketable securities:
Loans receivable	1,365.5	1,488.6
Total investments (cost: $23,771.3 and $24,897.0)	29,083.9	32,601.7
Loans payable	(1,847.3)	(2,069.7)
Fair Value, Measurements, Recurring \| Term Loan
Marketable securities:
Other unsecured debt	(1,354.4)	(953.1)
Fair Value, Measurements, Recurring \| U.S. government agency notes
Marketable securities:
Marketable securities excluding Real estate-related	627.3	902.9
Fair Value, Measurements, Recurring \| Foreign government agency notes
Marketable securities:
Marketable securities excluding Real estate-related		16.9
Fair Value, Measurements, Recurring \| U.S. treasury securities
Marketable securities:
Marketable securities excluding Real estate-related	12.0	574.0
Fair Value, Measurements, Recurring \| Corporate bonds
Marketable securities:
Marketable securities excluding Real estate-related		536.4
Fair Value, Measurements, Recurring \| Level 1: Quoted Prices in Active Markets for Identical Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties	0.0	0.0
Real estate joint ventures	0.0	0.0
Real estate funds	0.0	0.0
Real estate operating business	0.0	0.0
Marketable securities:
Loans receivable	0.0	0.0
Total investments (cost: $23,771.3 and $24,897.0)	0.0	0.0
Loans payable	0.0	0.0
Fair Value, Measurements, Recurring \| Level 1: Quoted Prices in Active Markets for Identical Assets \| Term Loan
Marketable securities:
Other unsecured debt	0.0	0.0
Fair Value, Measurements, Recurring \| Level 1: Quoted Prices in Active Markets for Identical Assets \| U.S. government agency notes
Marketable securities:
Marketable securities excluding Real estate-related	0.0	0.0
Fair Value, Measurements, Recurring \| Level 1: Quoted Prices in Active Markets for Identical Assets \| Foreign government agency notes
Marketable securities:
Marketable securities excluding Real estate-related		0.0
Fair Value, Measurements, Recurring \| Level 1: Quoted Prices in Active Markets for Identical Assets \| U.S. treasury securities
Marketable securities:
Marketable securities excluding Real estate-related	0.0	0.0
Fair Value, Measurements, Recurring \| Level 1: Quoted Prices in Active Markets for Identical Assets \| Corporate bonds
Marketable securities:
Marketable securities excluding Real estate-related		0.0
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties	0.0	0.0
Real estate joint ventures	0.0	0.0
Real estate funds	0.0	0.0
Real estate operating business	0.0	0.0
Marketable securities:
Loans receivable	0.0	0.0
Total investments (cost: $23,771.3 and $24,897.0)	639.3	2,030.2
Loans payable	0.0	0.0
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| Term Loan
Marketable securities:
Other unsecured debt	(854.4)	(453.1)
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| U.S. government agency notes
Marketable securities:
Marketable securities excluding Real estate-related	627.3	902.9
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| Foreign government agency notes
Marketable securities:
Marketable securities excluding Real estate-related		16.9
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| U.S. treasury securities
Marketable securities:
Marketable securities excluding Real estate-related	12.0	574.0
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| Corporate bonds
Marketable securities:
Marketable securities excluding Real estate-related		536.4
Fair Value, Measurements, Recurring \| Level 3: Significant Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties	19,191.3	20,444.0
Real estate joint ventures	6,341.5	7,103.6
Real estate funds	0.0	0.0
Real estate operating business	653.6	641.9
Marketable securities:
Loans receivable	1,365.5	1,488.6
Total investments (cost: $23,771.3 and $24,897.0)	27,551.9	29,678.1
Loans payable	(1,847.3)	(2,069.7)
Fair Value, Measurements, Recurring \| Level 3: Significant Unobservable Inputs \| Term Loan
Marketable securities:
Other unsecured debt	(500.0)	(500.0)
Fair Value, Measurements, Recurring \| Level 3: Significant Unobservable Inputs \| U.S. government agency notes
Marketable securities:
Marketable securities excluding Real estate-related	0.0	0.0
Fair Value, Measurements, Recurring \| Level 3: Significant Unobservable Inputs \| Foreign government agency notes
Marketable securities:
Marketable securities excluding Real estate-related		0.0
Fair Value, Measurements, Recurring \| Level 3: Significant Unobservable Inputs \| U.S. treasury securities
Marketable securities:
Marketable securities excluding Real estate-related	$ 0.0	0.0
Fair Value, Measurements, Recurring \| Level 3: Significant Unobservable Inputs \| Corporate bonds
Marketable securities:
Marketable securities excluding Real estate-related		$ 0.0

Fair Value Of Real Estate Operating Business

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Fair value of real estate property held for investment purposes.

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Fair value of loans receivable

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale, excluding real estate.

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Mortgage Loans Payable And Loans Payable, Fair Value

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Fair value of investments in real estate joint ventures .

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Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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