GOODWILL AND INTANGIBLE ASSETS - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 2,642.8	$ 2,642.8
Total	3,124.6	3,150.1
Trade Name
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	117.1	117.1
Investment Advisory Agreements
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	65.6	65.6
Investment Advisory Agreements
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets - investment advisory agreements	$ 299.1	$ 324.6

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

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