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GOODWILL AND INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill and Intangible Assets | Goodwill and intangible assets consist of the following at December 31:
(in millions) | 2024 |  | 2023
Goodwill | $ | 2,642.8 |  |  | $ | 2,642.8 |
Indefinite-lived intangible assets - trade name | 86.0 |  |  | 117.1 |
Indefinite-lived intangible assets - investment advisory agreements | 65.6 |  |  | 65.6 |
Definite-lived intangible assets - investment advisory agreements | 216.5 |  |  | 324.6 |
Total | $ | 3,010.9 |  |  | $ | 3,150.1 |
Schedule of Finite-Lived Intangible Assets | Definite-lived investment advisory agreement intangible assets consisted of the following at December 31 :
(in millions) |  | 2024 |  | 2023
Gross carrying amount |  | $ | 613.9 |  |  | $ | 613.9 |
Accumulated amortization & impairments |  | (397.4) |  |  | (289.3) |
Net carrying amount |  | $ | 216.5 |  |  | $ | 324.6 |
Remaining weighted-average estimated useful life |  | 3.7 |  | 5.5
Schedule of Indefinite-Lived Intangible Assets | Definite-lived investment advisory agreement intangible assets consisted of the following at December 31 :
(in millions) |  | 2024 |  | 2023
Gross carrying amount |  | $ | 613.9 |  |  | $ | 613.9 |
Accumulated amortization & impairments |  | (397.4) |  |  | (289.3) |
Net carrying amount |  | $ | 216.5 |  |  | $ | 324.6 |
Remaining weighted-average estimated useful life |  | 3.7 |  | 5.5
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Estimated amortization expense for the definite-lived investment advisory agreements intangible assets for the five succeeding years is as follows:
(in millions) | 2024
2025 | $ | 77.1 |
2026 | 61.8 |
2027 | 42.9 |
2028 | 12.7 |
2029 | 9.7 |

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