Revenue from Contracts with Customers - Disaggregation of Revenue by Asset Class (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
Money market
Disaggregation of Revenue [Line Items]
Total Revenue	208,443	186,760	618,472	559,622
Equity
Disaggregation of Revenue [Line Items]
Total Revenue	117,844	123,485	350,101	371,282
Fixed-income
Disaggregation of Revenue [Line Items]
Total Revenue	49,512	47,142	146,803	142,590
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 32,657	$ 45,269	$ 92,034	$ 144,583