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Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Goodwill [Roll Forward] |  |  |
Goodwill Additions, net of adjustments |  | $ 18.7 | $ 13.5
Goodwill, Written off Related to Sale of Business Unit |  | (0.6) |
Goodwill, Translation Adjustments |  | (4.3) | (170.3)
Goodwill | $ 4,454.8 | 4,541.8 | 4,454.8
Goodwill |  | 4,528.0 | 4,611.6
Markets Advisory |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill Additions, net of adjustments |  | 0.0 | 0.0
Goodwill, Written off Related to Sale of Business Unit |  | (0.4) |
Goodwill, Translation Adjustments | (69.8) | (1.7) |
Goodwill | 1,713.1 | 1,740.8 | 1,713.1
Goodwill |  | 1,742.9 | 1,782.9
Capital Markets |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill Additions, net of adjustments |  | 18.7 | 8.5
Goodwill, Written off Related to Sale of Business Unit |  | (0.2) |
Goodwill, Translation Adjustments |  | (2.0) | (76.4)
Goodwill | 1,916.0 | 1,965.7 | 1,916.0
Goodwill |  | 1,949.2 | 1,983.9
Work Dynamics |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill Additions, net of adjustments |  | 0.0 | 4.6
Goodwill, Written off Related to Sale of Business Unit |  | 0.0 |
Goodwill, Translation Adjustments |  | (0.5) | (20.8)
Goodwill | 523.7 | 532.1 | 523.7
Goodwill |  | 532.6 | 539.9
JLL Technologies |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill Additions, net of adjustments |  | 0.0 | 0.4
Goodwill, Written off Related to Sale of Business Unit |  | 0.0 |
Goodwill, Translation Adjustments |  | (0.1) | (0.2)
Goodwill | 247.7 | 247.6 | 247.7
Goodwill |  | 247.7 | 247.5
Investment Management [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Written off Related to Sale of Business Unit |  | 0.0 |
LaSalle Investment Management |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill Additions, net of adjustments |  | 0.0 | 0.0
Goodwill, Translation Adjustments |  | 0.0 | (3.1)
Goodwill | $ 54.3 | 55.6 | 54.3
Goodwill |  | $ 55.6 | $ 57.4

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