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Business Combinations, Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Goodwill [Line Items] |  |
Finite-Lived Intangible Assets, Net | $ 677.1 |
Indefinite-lived Intangible Assets (Excluding Goodwill) | 47.0 |
Goodwill [Roll Forward] |  |
Goodwill | 4,587.4 | $ 4,528.0
Goodwill Additions, net of adjustments | 64.0 | 18.7
Goodwill, Written off Related to Sale of Business Unit |  | (0.6)
Goodwill, Foreign Currency Translation Gain (Loss) | (40.1) | 41.3
Goodwill | 4,611.3 | 4,587.4
Markets Advisory |  |
Goodwill [Roll Forward] |  |
Goodwill | 1,759.3 | 1,742.9
Goodwill Additions, net of adjustments | 17.7 | 0.0
Goodwill, Written off Related to Sale of Business Unit |  | (0.4)
Goodwill, Foreign Currency Translation Gain (Loss) | (16.4) | 16.8
Goodwill | 1,760.6 | 1,759.3
Capital Markets [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 1,986.4 | 1,949.2
Goodwill Additions, net of adjustments | 3.4 | 18.7
Goodwill, Written off Related to Sale of Business Unit |  | (0.2)
Goodwill, Foreign Currency Translation Gain (Loss) | (18.3) | 18.7
Goodwill | 1,971.5 | 1,986.4
Work Dynamics |  |
Goodwill [Roll Forward] |  |
Goodwill | 537.7 | 532.6
Goodwill Additions, net of adjustments | 40.5 | 0.0
Goodwill, Written off Related to Sale of Business Unit |  | 0.0
Goodwill, Foreign Currency Translation Gain (Loss) | (5.0) | 5.1
Goodwill | 573.2 | 537.7
JLL Technologies |  |
Goodwill [Roll Forward] |  |
Goodwill | 247.7 | 247.7
Goodwill Additions, net of adjustments | 2.4 | 0.0
Goodwill, Written off Related to Sale of Business Unit |  | 0.0
Goodwill, Foreign Currency Translation Gain (Loss) | 0.0 | 0.0
Goodwill | 250.1 | 247.7
LaSalle Investment Management [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill | 56.3 | 55.6
Goodwill Additions, net of adjustments | 0.0 | 0.0
Goodwill, Written off Related to Sale of Business Unit |  | 0.0
Goodwill, Foreign Currency Translation Gain (Loss) | (0.4) | 0.7
Goodwill | $ 55.9 | $ 56.3

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- Definition The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. Also includes purchase price allocation adjustment for allocations not yet complete at the prior year end. + References No definition available. + Details
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