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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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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.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Amount of other-than-temporary impairment (OTTI) applied to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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