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Goodwill and Acquired Client Relationships (Tables)
 9 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Goodwill The following table presents the changes in the Company’s consolidated Affiliates’ Goodwill:
Goodwill
Balance, as of December 31, 2024
$2,504.9
Foreign currency translation
23.3
Balance, as of September 30, 2025
$2,528.2
Schedule of Changes in the Components of Acquired Client Relationships The following table presents the changes in the Company’s components of Acquired client relationships (net):
 
Acquired Client Relationships (Net)
 
Definite-lived
Indefinite-lived
Total
 
Gross Book
Value
Accumulated
Amortization
Net Book
Value
Net Book
Value
Net Book
Value
Balance, as of December 31, 2024
$1,255.5
$(1,075.2)
$180.3
$1,597.5
$1,777.8
Intangible amortization and impairments
—
(19.0)
(19.0)
(77.0)
(96.0)
Foreign currency translation
10.6
(10.6)
—
21.5
21.5
Balance, as of September 30, 2025
$1,266.1
$(1,104.8)
$161.3
$1,542.0
$1,703.3