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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquisition-related amortization | $ 28,600,000 | $ 27,200,000 | $ 54,600,000 | $ 54,300,000
Goodwill impairment | 0 |  | 0 |
Investment Advisory Agreements |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquisition-related amortization | 26,400,000 |  | 52,400,000 |
Estimated amortization expense, Remainder of 2023 | 52,400,000 |  | 52,400,000 |
Estimated amortization expense, 2024 | 92,200,000 |  | 92,200,000 |
Estimated amortization expense, 2025 | 90,800,000 |  | 90,800,000 |
Estimated amortization expense, 2026 | 73,700,000 |  | 73,700,000 |
Estimated amortization expense, 2027 | $ 49,500,000 |  | $ 49,500,000 |

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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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- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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