v3.26.1
Business Segment Reporting - Total Assets By Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Segment Reporting Information [Line Items]    
Total assets $ 31,328,139 $ 30,733,298
Continuing Operations    
Segment Reporting Information [Line Items]    
Total assets 31,328,139 30,733,298
Operating segments | Continuing Operations    
Segment Reporting Information [Line Items]    
Total assets 31,221,779 30,673,119
Operating segments | Retirement Solutions | Continuing Operations    
Segment Reporting Information [Line Items]    
Total assets 170,088 214,601
Operating segments | Portfolio Management | Continuing Operations    
Segment Reporting Information [Line Items]    
Total assets 31,051,691 30,458,518
Corporate and Other | Continuing Operations    
Segment Reporting Information [Line Items]    
Total assets $ 106,360 $ 60,179