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GOODWILL AND INTANGIBLE ASSETS - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Schedule of Intangible Assets and Goodwill [Line Items] |  |  |
Goodwill | $ 2,693.2 | $ 665.7 | $ 665.7
Total | 3,606.6 | 665.7 |
Investment advisory agreements |  |  |
Schedule of Intangible Assets and Goodwill [Line Items] |  |  |
Definite-lived intangible assets - investment advisory agreements | 613.9 | 0.0 |
Trade Names |  |  |
Schedule of Intangible Assets and Goodwill [Line Items] |  |  |
Indefinite-lived intangible assets - trade name | 134.7 | 0.0 |
Investment advisory agreements |  |  |
Schedule of Intangible Assets and Goodwill [Line Items] |  |  |
Indefinite-lived intangible assets - trade name | $ 164.8 | $ 0.0 |

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- Definition Schedule of Intangible Assets and Goodwill [Line Items] + References No definition available. + Details
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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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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