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Business and Basis of Presentation Noncontrolling Interests (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Background And Basis Of Presentation [Line Items]          
Foreign Exchange $ 9,973 $ 0 $ 13,770 $ 0  
Stockholders' Equity Attributable to Noncontrolling Interest 168,522   168,522   $ 197,755
Reclassification from nonredeemable noncontrolling interest including remeasurement at fair value 42,180        
Reclassification to nonredeemable noncontrolling interest (5,136)        
Put / call option exercise     (1,815)    
Change in Nonredeemable NCI Resulting From Purchase of Shares From Minority Interest Owners     14,362    
Insurance Distribution          
Background And Basis Of Presentation [Line Items]          
Stockholders' Equity Attributable to Noncontrolling Interest $ 117,604   $ 117,604   $ 146,837
Ambac Assurance Corporation [Member]          
Background And Basis Of Presentation [Line Items]          
Preferred Stock, Shares Outstanding 4,596   4,596   4,596
Preferred Stock, Liquidation Preference, Value $ 114,900   $ 114,900   $ 114,900
Stockholders' Equity Attributable to Noncontrolling Interest $ 50,918   $ 50,918