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GOODWILL AND INTANGIBLE ASSETS - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 2,643.9	$ 2,693.2
Total	3,530.2	3,606.6
Trade Name
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	134.7	134.7
Investment Advisory Agreements
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	164.8	164.8
Investment Advisory Agreements
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets - investment advisory agreements	$ 586.8	$ 613.9

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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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