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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total Revenue	$ 408,456	$ 402,656	$ 1,207,410	$ 1,218,077
Investment Advisory
Disaggregation of Revenue [Line Items]
Total Revenue	274,621	276,771	809,537	851,089
Administrative Services
Disaggregation of Revenue [Line Items]
Total Revenue	97,687	88,023	287,819	252,402
Distribution
Disaggregation of Revenue [Line Items]
Total Revenue	29,193	31,466	90,619	96,360
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 6,955	$ 6,396	$ 19,435	$ 18,226

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