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Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract] |  |
Finite-Lived Intangible Assets, Net | $ 629.1 |
Identifiable intangibles with indefinite useful lives | 51.5 |
Goodwill [Line Items] |  |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 15.4 | $ 15.3
Goodwill [Roll Forward] |  |
Goodwill Additions, net of adjustments | 35.3 |
Goodwill, Written off Related to Sale of Business Unit | (11.7) | (0.7)
Goodwill, Translation Adjustments | (36.2) | (3.5)
Goodwill | 4,212.1 | 4,164.0
Goodwill | 4,224.7 | 4,168.2
Investment Management [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill Additions, net of adjustments | 0.0 |
Goodwill, Written off Related to Sale of Business Unit | 0.0 | 0.0
Goodwill, Translation Adjustments | (0.4) | (0.3)
Goodwill | 57.4 | 56.8
Goodwill | 57.8 | 57.1
Americas [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill Additions, net of adjustments | 35.3 |
Goodwill, Written off Related to Sale of Business Unit | (11.0) | 0.0
Goodwill, Translation Adjustments | 0.1 | (1.1)
Goodwill | 2,902.4 | 2,876.5
Goodwill | 2,878.0 | 2,877.6
EMEA [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill Additions, net of adjustments | 0.0 |
Goodwill, Written off Related to Sale of Business Unit | (0.7) | (0.7)
Goodwill, Translation Adjustments | (26.8) | (4.7)
Goodwill | 932.2 | 910.5
Goodwill | 959.7 | 915.9
Asia Pacific [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill Additions, net of adjustments | 0.0 |
Goodwill, Written off Related to Sale of Business Unit | 0.0 | 0.0
Goodwill, Translation Adjustments | (9.1) | 2.6
Goodwill | 320.1 | 320.2
Goodwill | $ 329.2 | $ 317.6

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- Definition The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. Also includes purchase price allocation adjustment for allocations not yet complete at the prior year end. + References No definition available. + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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