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, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties	$ 17,398.7	$ 16,476.7
Real estate operating business	286.0	250.0
Marketable securities:
Marketable securities excluding Real estate-related	1,761.3	739.3
Total investments (cost: $23,146.4 and $21,967.9)	28,595.2	25,550.7
Loans payable	(2,343.2)	(2,411.4)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties	17,398.7	16,476.7
Real estate joint ventures	7,053.1	6,128.9
Real estate funds	648.0	393.2
Real estate operating business	286.0	250.0
Marketable securities:
Loans receivable	1,448.1	1,562.6
Total investments (cost: $23,146.4 and $21,967.9)	28,595.2	25,550.7
Loans payable	(2,343.2)	(2,411.4)
Fair Value, Measurements, Recurring \| U.S. government agency notes
Marketable securities:
Marketable securities excluding Real estate-related	547.6	157.0
Fair Value, Measurements, Recurring \| Foreign government agency notes
Marketable securities:
Marketable securities excluding Real estate-related	5.2
Fair Value, Measurements, Recurring \| U.S. treasury securities
Marketable securities:
Marketable securities excluding Real estate-related	729.7	582.3
Fair Value, Measurements, Recurring \| Corporate bonds
Marketable securities:
Marketable securities excluding Real estate-related	478.8
Fair Value, Measurements, Recurring \| Level 1: Quoted Prices in Active Markets for Identical Assets
Marketable securities:
Total investments (cost: $23,146.4 and $21,967.9)	0.0	0.0
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs
Marketable securities:
Total investments (cost: $23,146.4 and $21,967.9)	1,761.3	739.3
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| U.S. government agency notes
Marketable securities:
Marketable securities excluding Real estate-related	547.6	157.0
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| Foreign government agency notes
Marketable securities:
Marketable securities excluding Real estate-related	5.2
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| U.S. treasury securities
Marketable securities:
Marketable securities excluding Real estate-related	729.7	582.3
Fair Value, Measurements, Recurring \| Level 2: Significant Other Observable Inputs \| Corporate bonds
Marketable securities:
Marketable securities excluding Real estate-related	478.8
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	17,398.7	16,476.7
Real estate joint ventures	7,053.1	6,128.9
Real estate operating business	286.0	250.0
Marketable securities:
Loans receivable	1,448.1	1,562.6
Total investments (cost: $23,146.4 and $21,967.9)	26,185.9	24,418.2
Loans payable	$ (2,343.2)	$ (2,411.4)

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (a)
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-Publisher FASB
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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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