Significant Accounting Policies (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Business Combination [Line Items]
Goodwill	$ 3,598,591	$ 3,598,591
Sanford C Bernstein Inc Acquisition
Business Combination [Line Items]
Goodwill	2,600,000
CarVal
Business Combination [Line Items]
Goodwill	666,100
Various smaller acquisitions
Business Combination [Line Items]
Goodwill	$ 291,900