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GOODWILL AND INTANGIBLE ASSETS
 3 Months Ended
Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS GOODWILL AND INTANGIBLE ASSETS.
Goodwill and intangible assets consist of the following:

(in millions)3/31/202512/31/2024
Goodwill$2,642.8 $2,642.8 
Indefinite-lived intangible assets - trade name86.0 86.0 
Indefinite-lived intangible assets - investment advisory agreements65.6 65.6 
Definite-lived intangible assets - investment advisory agreements192.1 216.5 
Total$2,986.5 $3,010.9 

Amortization and impairment expense for the definite-lived intangible assets for the first quarter was $24.4 million in 2025 and $25.5 million in 2024. Estimated amortization expense for the definite-lived intangible assets for the five succeeding years is as follows:

(in millions)
Remaining 2025
$58.9 
202659.9 
202741.1 
202811.8 
20298.8 

We evaluate the carrying amount of goodwill and indefinite-lived intangible assets for possible impairment on an annual basis in the fourth quarter or if triggering events occur that require us to evaluate for impairment earlier. No triggering events arose during the three months ended March 31, 2025.