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Business Combinations, Goodwill by Segment (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]
Finite-Lived Intangible Assets, Net	$ 601.9
Identifiable intangibles with indefinite useful lives	52.0
Goodwill [Line Items]
Servicing Asset at Amortized Cost, Other than Temporary Impairments	15.3	$ 10.6
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		1,430.0
Goodwill, Written off Related to Sale of Business Unit	(0.7)	(0.9)
Goodwill, Translation Adjustments	(3.5)	(43.7)
Goodwill	4,164.0	4,083.2
Goodwill	4,168.2	2,697.8
Asia Pacific [Member]
Goodwill [Roll Forward]
Goodwill, Written off Related to Sale of Business Unit	0.0	0.0
EMEA [Member]
Goodwill [Roll Forward]
Goodwill, Written off Related to Sale of Business Unit	(0.7)	(0.9)
Investment Management [Member]
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		35.5
Goodwill, Written off Related to Sale of Business Unit	0.0	0.0
Goodwill, Translation Adjustments	(0.3)	(1.8)
Goodwill	56.8	55.9
Goodwill	57.1	22.2
Americas [Member]
Goodwill [Roll Forward]
Goodwill, Written off Related to Sale of Business Unit	0.0	0.0
Americas [Member] | Reportable Subsegments [Member]
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		1,392.9
Goodwill, Translation Adjustments	(1.1)	0.3
Goodwill	2,876.5	2,845.2
Goodwill	2,877.6	1,452.0
EMEA [Member] | Reportable Subsegments [Member]
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		1.6
Goodwill, Translation Adjustments	(4.7)	(37.6)
Goodwill	910.5	869.9
Goodwill	915.9	906.8
Asia Pacific [Member] | Reportable Subsegments [Member]
Goodwill [Roll Forward]
Goodwill Additions, net of adjustments		0.0
Goodwill, Translation Adjustments	2.6	(4.6)
Goodwill	320.2	312.2
Goodwill	317.6	$ 316.8
Other Intangible Assets [Member]
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]
Finite-Lived Intangible Assets, Net	213.1
Mortgage servicing rights [Member]
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]
Finite-Lived Intangible Assets, Net	$ 388.8

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-- None. No documentation exists for this element. --

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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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