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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) - Investment advisory agreements - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Indefinite-lived intangible assets
Intangible assets weighted average useful life	3 years 8 months 12 days	5 years 6 months
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	$ 613.9	$ 613.9
Accumulated amortization & impairments	(397.4)	(289.3)
Accumulated amortization & impairments	$ 216.5	$ 324.6

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
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-Name Accounting Standards Codification
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 30
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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/2009/role/commonPracticeRef
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