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Revenue from Contracts with Customers - Disaggregation of Revenue by Performance Obligation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total Revenue	$ 423,540	$ 396,371
Investment Advisory
Disaggregation of Revenue [Line Items]
Total Revenue	287,460	264,294
Administrative Services
Disaggregation of Revenue [Line Items]
Total Revenue	101,109	94,786
Distribution
Disaggregation of Revenue [Line Items]
Total Revenue	28,765	31,366
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 6,206	$ 5,925

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