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Investments (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) investment | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Number of separate property or fund co-investments | investment | 49 |  |
Investments | $ 816.2 |  | $ 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 | 18.8 | 32.8 |
Investments in Real Estate Ventures, at Fair Value, Distributions | (6.4) | (6.6) |
Unrealized Gain (Loss) on Investments | (3.1) | (3.3) |
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation | (6.3) | 7.7 |
Fair value investments at end of the period | 743.8 | 825.5 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value [Abstract] |  |  |
Fair value investments at beginning of the period | 367.3 | 452.0 |
Fair value investments at end of the period | 369.7 | $ 73.1 |
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 | 3.2 |  |
JLL Technologies |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 12.5 |  |
Investments | 402.3 |  | 397.6
LaSalle Investment Company II [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 60.3 |  |
LaSalle Investment Management |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 332.7 |  |
Investments | 382.5 |  | 388.3
Other Investments and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments | $ 31.4 |  | $ 30.7

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