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	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties	$ 20,179.1	$ 18,903.9
Real estate operating business	487.6	326.3
Marketable securities:
Marketable securities excluding Real estate-related	2,541.2	2,207.8
Total investments (cost: $24,699.8 and $24,326.7)	32,596.2	30,918.0
Loans payable	(2,338.0)	(2,380.5)
Line of credit	(500.0)	(500.0)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties	20,179.1	18,903.9
Real estate joint ventures	7,253.3	7,175.9
Real estate funds	805.8	811.5
Real estate operating business	487.6	326.3
Marketable securities:
Loans receivable	1,329.2	1,492.6
Total investments (cost: $24,699.8 and $24,326.7)	32,596.2	30,918.0
Loans payable	(2,338.0)	(2,380.5)
Line of credit	(500.0)	(500.0)
Fair Value, Measurements, Recurring \| U.S. government agency notes
Marketable securities:
Marketable securities excluding Real estate-related	1,076.5	864.1
Fair Value, Measurements, Recurring \| Foreign government agency notes
Marketable securities:
Marketable securities excluding Real estate-related	17.1	7.6
Fair Value, Measurements, Recurring \| U.S. treasury securities
Marketable securities:
Marketable securities excluding Real estate-related	875.2	784.3
Fair Value, Measurements, Recurring \| Corporate bonds
Marketable securities:
Marketable securities excluding Real estate-related	572.4	551.8
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: $24,699.8 and $24,326.7)	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 \| 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	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	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: $24,699.8 and $24,326.7)	2,541.2	2,207.8
Loans payable	0.0	0.0
Line of credit	0.0	0.0
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| U.S. government agency notes
Marketable securities:
Marketable securities excluding Real estate-related	1,076.5	864.1
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| Foreign government agency notes
Marketable securities:
Marketable securities excluding Real estate-related	17.1	7.6
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| U.S. treasury securities
Marketable securities:
Marketable securities excluding Real estate-related	875.2	784.3
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| Corporate bonds
Marketable securities:
Marketable securities excluding Real estate-related	572.4	551.8
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	20,179.1	18,903.9
Real estate joint ventures	7,253.3	7,175.9
Real estate funds	0.0	0.0
Real estate operating business	487.6	326.3
Marketable securities:
Loans receivable	1,329.2	1,492.6
Total investments (cost: $24,699.8 and $24,326.7)	29,249.2	27,898.7
Loans payable	(2,338.0)	(2,380.5)
Line of credit	(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	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	$ 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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Fair value of the amount outstanding under the credit facility.

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-Topic 825
-SubTopic 10
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