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Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract] |  |
Finite-Lived Intangible Assets, Net | $ 620.0 |
Identifiable intangibles with indefinite useful lives | 52.5 |
Goodwill [Line Items] |  |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 7.6 | $ 9.3
Goodwill [Roll Forward] |  |
Goodwill, Written off Related to Sale of Business Unit | (11.7) | (0.7)
Goodwill, Translation Adjustments | (7.9) | (46.6)
Goodwill | 4,205.1 | 4,120.9
Goodwill | 4,224.7 | 4,168.2
Investment Management [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Written off Related to Sale of Business Unit | 0.0 | 0.0
Goodwill, Translation Adjustments | 0.0 | (1.0)
Goodwill | 57.8 | 56.1
Goodwill | 57.8 | 57.1
Americas [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Written off Related to Sale of Business Unit | (11.0) | 0.0
Goodwill, Translation Adjustments | 1.0 | (1.7)
Goodwill | 2,868.0 | 2,875.9
Goodwill | 2,878.0 | 2,877.6
EMEA [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Written off Related to Sale of Business Unit | (0.7) | (0.7)
Goodwill, Translation Adjustments | (4.5) | (41.4)
Goodwill | 954.5 | 873.8
Goodwill | 959.7 | 915.9
Asia Pacific [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Written off Related to Sale of Business Unit | 0.0 | 0.0
Goodwill, Translation Adjustments | (4.4) | (2.5)
Goodwill | 324.8 | 315.1
Goodwill | $ 329.2 | $ 317.6

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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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