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GOODWILL AND INTANGIBLE ASSETS (Tables)
 12 Months Ended
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)20242023
Goodwill$2,642.8 $2,642.8 
Indefinite-lived intangible assets - trade name86.0 117.1 
Indefinite-lived intangible assets - investment advisory agreements65.6 65.6 
Definite-lived intangible assets - investment advisory agreements216.5 324.6 
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)20242023
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 life3.75.5
Schedule of Indefinite-Lived Intangible Assets
Definite-lived investment advisory agreement intangible assets consisted of the following at December 31 :

(in millions)20242023
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 life3.75.5
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 
202661.8 
202742.9 
202812.7 
20299.7