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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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total Revenue	$ 402,583	$ 433,232	$ 798,954	$ 815,421
Investment Advisory
Disaggregation of Revenue [Line Items]
Total Revenue	270,622	310,337	534,916	574,318
Administrative Services
Disaggregation of Revenue [Line Items]
Total Revenue	95,346	85,199	190,132	164,378
Distribution
Disaggregation of Revenue [Line Items]
Total Revenue	30,060	32,017	61,426	64,894
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 6,555	$ 5,679	$ 12,480	$ 11,831

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