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Business and Basis of Presentation Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2025
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2023
Derivative [Line Items]                  
Stockholders' Equity Attributable to Noncontrolling Interest $ 115,790   $ 115,790   $ 197,755        
Preferred Stock, Shares Issued 0   0   0        
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 188,247 $ 203,696 $ 188,247 $ 203,696 $ 140,860   $ 190,347 $ 17,079 $ 17,079
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest (271) (1,776) (1,012) (857)          
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (300) (626) (1,219) (1,676)          
Redeemable Noncontrolling Interest, Equity, Redemption Value 188,247   188,247            
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest (892) 1,773 (2,292) 859          
Noncontrolling Interest, Change in Redemption Value (569) (2,402) (2,717) (2,533)          
Temporary Equity, Accretion to Redemption Value, Adjustment 569 2,402 2,717 2,533          
Disposal Group, Including Discontinued Operation, Net Assets Held-For Sale 0   0            
Disposal Group, Including Discontinued Operation, Assets   7,358,328   7,358,328   $ 6,267,200      
Disposal Group, Including Discontinued Operation, Liabilities 0   0     $ 5,887,685      
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent (80,890) (9,386) (163,288) 28,936          
Put / call option exercise 0 0 (1,815) 0          
Payment for Put/Call Option     1,068            
Payments to Noncontrolling Interests 2,967   (71,345)            
Discontinued Operations, Held-for-Sale or Disposed of by Sale | Ambac Assurance Corporation [Member]                  
Derivative [Line Items]                  
Disposal Group, Including Discontinued Operation, Consideration, Fair Value, Net 407,300   407,300   399,727        
Disposal Group, Including Discontinued Operation, Estimated Closing Costs 7,098   7,098   7,235        
Disposal Group, Including Discontinued Operation, Consideration, Fair Value, Net, After Allowance For Closing Costs 400,202   400,202   392,492        
Disposal Group, Including Discontinued Operation, Net Assets Held-For Sale 1,002,719   1,002,719   962,637        
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax     687,613   570,145        
Disposal Group, Including Discontinued Operation, Investment         2,226,505        
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents         8,322        
Disposal Group, Including Discontinued Operation, Premiums Receivable, Net         217,096        
Disposal Group, Including Discontinued Operation, Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments         25,274        
Disposal Group, Including Discontinued Operation, Prepaid Reinsurance Premiums         79,074        
Disposal Group, Including Discontinued Operation, Subrogation Recoverable         113,962        
Disposal Group, Including Discontinued Operation, Intangible Assets         213,457        
Disposal Group, Including Discontinued Operation, Other Assets         49,396        
Disposal Group, Including Discontinued Operation, Variable Interest Entity Assets         3,904,259        
Disposal Group, Including Discontinued Operation, Valuation Allowance On Assets Held-For-Sale         (570,145)        
Disposal Group, Including Discontinued Operation, Assets         6,267,200        
Disposal Group, Including Discontinued Operation, Unearned Premiums         228,177        
Disposal Group, Including Discontinued Operation, Liability for Claims and Claims Adjustment Expense         577,167        
Disposal Group, Including Discontinued Operation, Reinsurance Payable         56,404        
Disposal Group, Including Discontinued Operation, Liabilities, Long-Term Debt And Accrued Interest         1,046,658        
Disposal Group, Including Discontinued Operation, Other Liabilities         105,772        
Disposal Group, Including Discontinued Operation, Variable Interest Entity Liabilities         3,873,507        
Disposal Group, Including Discontinued Operation, Liabilities         $ 5,887,685        
Disposal Group, Including Discontinued Operation, Revenue (65,455) (44,141) (121,050) (150,687)          
Disposal Group, Including Discontinued Operation, Operating Expense $ (88,425) $ (49,906) (156,192) $ (110,986)          
Retained Earnings [Member]                  
Derivative [Line Items]                  
Noncontrolling Interest, Change in Redemption Value     $ (12,992)