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Revenue from Contracts with Customers - Disaggregation of Revenue by Performance Obligation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Total Revenue	$ 469,446	$ 408,456	$ 1,317,830	$ 1,207,410
Investment Advisory
Disaggregation of Revenue [Line Items]
Total Revenue	310,366	274,621	885,261	809,537
Administrative Services
Disaggregation of Revenue [Line Items]
Total Revenue	107,234	97,687	310,000	287,819
Distribution
Disaggregation of Revenue [Line Items]
Total Revenue	39,225	29,193	96,312	90,619
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 12,621	$ 6,955	$ 26,257	$ 19,435

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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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