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Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract] |  |
Finite-Lived Intangible Assets, Net | $ 634.9 |
Identifiable intangibles with indefinite useful lives | 52.1 |
Goodwill [Line Items] |  |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 3.1 | $ 5.9
Goodwill [Roll Forward] |  |
Goodwill, Written off Related to Sale of Business Unit | (11.7) |
Goodwill, Translation Adjustments | (11.3) | (63.9)
Goodwill | 4,201.7 | 4,104.3
Goodwill | 4,224.7 | 4,168.2
Investment Management [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Written off Related to Sale of Business Unit | 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) |
Goodwill, Translation Adjustments | 0.3 | (2.9)
Goodwill | 2,867.3 | 2,874.7
Goodwill | 2,878.0 | 2,877.6
EMEA [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Written off Related to Sale of Business Unit | (0.7) |
Goodwill, Translation Adjustments | (8.6) | (46.6)
Goodwill | 950.4 | 869.3
Goodwill | 959.7 | 915.9
Asia Pacific [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Written off Related to Sale of Business Unit | 0.0 |
Goodwill, Translation Adjustments | (3.0) | (13.4)
Goodwill | 326.2 | 304.2
Goodwill | $ 329.2 | $ 317.6

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + 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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