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GOODWILL AND INTANGIBLE ASSETS (Tables)
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill and Intangible Assets
Goodwill and intangible assets consist of the following:

(in millions)3/31/202412/31/2023
Goodwill$2,642.8 $2,642.8 
Indefinite-lived intangible assets - trade name117.1 117.1 
Indefinite-lived intangible assets - investment advisory agreements65.6 65.6 
Definite-lived intangible assets - investment advisory agreements299.1 324.6 
Total$3,124.6 $3,150.1 
Schedule of Definite-Lived Intangible Assets, Future Amortization Expense Estimated amortization expense for the definite-lived intangible assets for the five succeeding years is a follows:
(in millions)
Remaining 2024
$64.5 
202584.7 
202667.6 
202746.0 
202814.3