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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquisition-related amortization and impairment costs | $ 38,500,000 | $ 27,100,000 | $ 93,100,000 | $ 81,400,000
Goodwill impairment | 0 |  | 0 |
Investment Advisory Agreements |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquisition-related amortization and impairment costs | 35,000,000 |  | 87,400,000 |
Estimated amortization expense, Remainder of 2023 | 26,800,000 |  | 26,800,000 |
Estimated amortization expense, 2024 | 89,200,000 |  | 89,200,000 |
Estimated amortization expense, 2025 | 87,800,000 |  | 87,800,000 |
Estimated amortization expense, 2026 | 70,800,000 |  | 70,800,000 |
Estimated amortization expense, 2027 | $ 48,700,000 |  | $ 48,700,000 |

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- Definition The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with acquisition of business. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 + Details
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