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Business Combinations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 81.2 |  | $ 81.2 |  |  |
Business Combinations, Guaranteed Deferred Acquisition Obligation |  |  | 0.0 | $ 6.5 |  |
Business Combination, contingent earn-out consideration |  |  | 0.0 | 1.5 |  |
Redeemable Noncontrolling Interest | 8.1 |  | $ 8.1 |  | $ 8.6 |
Document Period End Date |  |  | Jun. 30, 2020 |  |  |
Payment for Contingent Consideration Liability, Total |  |  | $ 47.7 |  |  |
Goodwill | 4,120.9 | $ 2,730.7 | 4,120.9 | 2,730.7 | 4,168.2 | $ 2,697.8
Reportable Subsegments [Member] | Americas [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 2,875.9 | 1,456.4 | 2,875.9 | 1,456.4 | 2,877.6 | 1,452.0
Reportable Subsegments [Member] | EMEA [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 873.8 | 900.4 | 873.8 | 900.4 | 915.9 | 906.8
Reportable Subsegments [Member] | Asia Pacific [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 315.1 | 317.3 | 315.1 | 317.3 | 317.6 | 316.8
Investment Management [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 56.1 | 56.6 | 56.1 | 56.6 | $ 57.1 | $ 22.2
HFF Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Integration Related Costs | $ 20.1 | $ 3.2 | $ 41.4 | $ 9.7 |  |

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