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Business Combinations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 64.9 |  | $ 64.9 |  |  |
Business Combination, contingent earn-out consideration |  |  | 3.8 | $ 0.0 |  |
Redeemable Noncontrolling Interest | 7.5 |  | $ 7.5 |  | $ 7.8 |
Document Period End Date |  |  | Jun. 30, 2021 |  |  |
Payment for Contingent Consideration Liability, Total |  |  | $ 78.4 |  |  |
Goodwill | 4,205.1 | $ 4,120.9 | 4,205.1 | 4,120.9 | 4,224.7 | $ 4,168.2
Americas [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 2,868.0 | 2,875.9 | 2,868.0 | 2,875.9 | 2,878.0 | 2,877.6
EMEA [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 954.5 | 873.8 | 954.5 | 873.8 | 959.7 | 915.9
Asia Pacific [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 324.8 | 315.1 | 324.8 | 315.1 | 329.2 | 317.6
Investment Management [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 57.8 | 56.1 | 57.8 | 56.1 | $ 57.8 | $ 57.1
HFF Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Integration Related Costs | $ 12.4 | $ 20.1 | $ 23.9 | $ 41.4 |  |

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