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Revenue from Contracts with Customers - Disaggregation of Revenue by Performance Obligation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total Revenue	$ 424,844	$ 402,583	$ 848,384	$ 798,954
Investment Advisory
Disaggregation of Revenue [Line Items]
Total Revenue	287,435	270,622	574,895	534,916
Administrative Services
Disaggregation of Revenue [Line Items]
Total Revenue	101,657	95,346	202,766	190,132
Distribution
Disaggregation of Revenue [Line Items]
Total Revenue	28,322	30,060	57,087	61,426
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 7,430	$ 6,555	$ 13,636	$ 12,480

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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