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Investments (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) investment	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) investment	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of separate property or fund co-investments | investment	49		49
Investments	$ 819.7		$ 819.7		$ 816.6
Fair Value [Abstract]
Fair value investments at beginning of the period			740.8	$ 794.9
Investments in Real Estate Ventures, at Fair Value, Additions			43.4	123.8
Investments in Real Estate Ventures, at Fair Value, Distributions			(11.6)	(11.1)
Unrealized Gain (Loss) on Investments			(17.3)	(110.5)
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation			(10.6)	5.4
Fair value investments at end of the period	744.7	$ 802.5	744.7	802.5
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value [Abstract]
Fair value investments at beginning of the period	369.7	466.5	367.3	452.0
Fair value investments at end of the period	367.8	64.3	367.8	64.3
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Investments [Member]
Fair Value [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	5.2	$ 63.8	8.4	$ 63.8
JLL Technologies
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	11.7		11.7
Investments	404.5		404.5		397.6
LaSalle Investment Company II [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	60.3		60.3
LaSalle Investment Management
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	254.7		254.7
Investments	384.1		384.1		388.3
Other Investments and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Schedule of Equity Method Investments [Line Items]
Investments	$ 31.1		$ 31.1		$ 30.7

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