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	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties	$ 16,223.8	$ 18,020.3
Real estate operating business	897.6	685.9
Marketable securities:
Marketable securities excluding real estate-related	383.9	147.4
Loans payable	(1,741.6)	(1,862.5)
Line of credit	(72.0)	(463.0)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties	16,223.8	18,020.3
Real estate joint ventures	5,725.1	5,881.2
Real estate operating business	897.6	685.9
Marketable securities:
Loans receivable	1,021.7	1,183.7
Loans payable	(1,741.6)	(1,862.5)
Line of credit	(72.0)	(463.0)
Fair Value, Measurements, Recurring \| Term Loan
Marketable securities:
Other unsecured debt	(895.8)	(881.6)
Fair Value, Measurements, Recurring \| U.S. government agency notes
Marketable securities:
Marketable securities excluding real estate-related	249.2	38.0
Fair Value, Measurements, Recurring \| U.S. treasury securities
Marketable securities:
Marketable securities excluding real estate-related	134.7	109.4
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 operating business	0.0	0.0
Marketable securities:
Loans receivable	0.0	0.0
Loans payable	0.0	0.0
Line of credit	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 \| U.S. treasury securities
Marketable securities:
Marketable securities excluding real estate-related	0.0	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 operating business	0.0	0.0
Marketable securities:
Loans receivable	0.0	0.0
Loans payable	0.0	0.0
Line of credit	0.0	0.0
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| Term Loan
Marketable securities:
Other unsecured debt	(895.8)	(881.6)
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| U.S. government agency notes
Marketable securities:
Marketable securities excluding real estate-related	249.2	38.0
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| U.S. treasury securities
Marketable securities:
Marketable securities excluding real estate-related	134.7	109.4
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	16,223.8	18,020.3
Real estate joint ventures	5,725.1	5,881.2
Real estate operating business	897.6	685.9
Marketable securities:
Loans receivable	1,021.7	1,183.7
Loans payable	(1,741.6)	(1,862.5)
Line of credit	(72.0)	(463.0)
Fair Value, Measurements, Recurring \| Level 3: Significant Unobservable Inputs \| Term Loan
Marketable securities:
Other unsecured debt	0.0	0.0
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 \| U.S. treasury securities
Marketable securities:
Marketable securities excluding real estate-related	$ 0.0	$ 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 portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value of the amount outstanding under the credit facility.

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