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Business Combinations (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 86.0 |  |  |
Business Combinations, Guaranteed Deferred Acquisition Obligation | 0.0 | $ 6.5 |  |
Business Combination, contingent earn-out consideration | 0.0 | 1.5 |  |
Redeemable Noncontrolling Interest | $ 8.6 |  | $ 8.6 |
Document Period End Date | Mar. 31, 2020 |  |  |
Payment for Contingent Consideration Liability, Total | $ 12.9 |  |  |
Goodwill | 4,104.3 | 2,738.3 | 4,168.2 | $ 2,697.8
Reportable Subsegments [Member] | Americas [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | 2,874.7 | 1,455.6 | 2,877.6 | 1,452.0
Reportable Subsegments [Member] | EMEA [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | 869.3 | 910.7 | 915.9 | 906.8
Reportable Subsegments [Member] | Asia Pacific [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | 304.2 | 317.5 | 317.6 | 316.8
Investment Management [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | 56.1 | 54.5 | $ 57.1 | $ 22.2
HFF Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Integration Related Costs | $ 21.3 | $ 6.5 |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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