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Business Combinations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 22.2 | $ 0.0 |  |
Cash Acquired from Acquisition |  |  | 6.7 |  |  |
Business Combination, contingent earn-out consideration |  |  | 31.3 | 0.0 |  |
Goodwill, Acquired During Period |  |  | 35.3 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | 19.5 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | $ 1.3 |  | $ 1.3 |  |  |
Document Period End Date |  |  | Sep. 30, 2021 |  |  |
Payment for Contingent Consideration Liability, Total |  |  | $ 82.5 |  |  |
Goodwill | 4,212.1 | $ 4,164.0 | 4,212.1 | 4,164.0 | $ 4,224.7 | $ 4,168.2
Americas [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 2,902.4 | 2,876.5 | 2,902.4 | 2,876.5 | 2,878.0 | 2,877.6
EMEA [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 932.2 | 910.5 | 932.2 | 910.5 | 959.7 | 915.9
Asia Pacific [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 320.1 | 320.2 | 320.1 | 320.2 | 329.2 | 317.6
Investment Management [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 57.4 | 56.8 | 57.4 | 56.8 | $ 57.8 | $ 57.1
HFF Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Integration Related Costs | $ 6.6 | $ 13.8 | $ 30.5 | $ 55.2 |  |

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