Acquisitions - Intangible Assets Acquired (Details) - AlphaSimplex Group, LLC $ in Thousands	Apr. 01, 2023 USD ($)
Definite-lived intangible assets:
Approximate Fair Value (in thousands)	$ 55,400
Investment management agreements
Definite-lived intangible assets:
Approximate Fair Value (in thousands)	$ 52,000
Weighted Average of Useful Life (in years)	10 years 6 months
Trade names
Definite-lived intangible assets:
Approximate Fair Value (in thousands)	$ 3,400
Weighted Average of Useful Life (in years)	9 years