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Related Party Transactions - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
May 27, 2025
director
shares
Jul. 01, 2022
USD ($)
Jul. 01, 2022
EUR (€)
Mar. 16, 2020
Mar. 15, 2020
Jul. 31, 2019
USD ($)
Dec. 31, 2018
Jan. 01, 2018
Jul. 01, 2016
Jul. 01, 2013
Jan. 01, 2012
EUR (€)
Apr. 01, 2011
EUR (€)
Jun. 11, 2008
Jul. 01, 2007
Sep. 30, 2025
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
Mar. 31, 2023
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
Jan. 01, 2025
USD ($)
Dec. 31, 2024
USD ($)
Jul. 26, 2022
Jul. 01, 2022
EUR (€)
Jul. 01, 2018
Related Party Transaction [Line Items]                                                  
Number of independent directors | director 2                                                
General and administrative expenses                               $ 5,080 $ 1,178   $ 6,223 $ 2,799          
Number of directors | director 7                                                
Net loan receivable from related party                               107,490     107,490     $ 0      
Decrease in allowance for expected credit losses on reinsurance recoverable where credit losses were previously recognized                               1,655     1,655            
Investment income                               1,533 54   1,567 118          
AmTrust North America Inc                                                  
Related Party Transaction [Line Items]                                                  
General and administrative expenses                               96 $ 176   244 $ 616          
Kestrel Intermediate Ledbetter Holdings                                                  
Related Party Transaction [Line Items]                                                  
Number of directors, selected by affiliate | director 4                                                
AmTrust Financial Services, Inc.                                                  
Related Party Transaction [Line Items]                                                  
Number of directors, selected by affiliate | director 3                                                
Net loan receivable from related party                               107,490     107,490            
Decrease in allowance for expected credit losses on reinsurance recoverable where credit losses were previously recognized                                     0            
Investment income                               $ 659     $ 659            
Effective yield                               5.80%     5.80%            
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment                                                  
Related Party Transaction [Line Items]                                                  
Percent of premiums written, net of cost of unaffiliated inuring reinsurance from related party                           40.00%                      
Percent of losses with respect to current lines of business, excluding those above covered business threshold to related party           40.00%       40.00%       40.00%                      
Commission rate, percent of ceded written premiums                         34.375% 31.00%                      
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Minimum                                                  
Related Party Transaction [Line Items]                                                  
Commission rate, adjustment criteria, loss ratio floor                   81.50%                              
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Maximum                                                  
Related Party Transaction [Line Items]                                                  
Commission rate, adjustment criteria, loss ratio ceiling                   95.00%                              
AmTrust Financial Services, Inc. | European Hospital Liability Quota Share                                                  
Related Party Transaction [Line Items]                                                  
Commission rate, percent of ceded written premiums                       5.00%                          
Premiums and losses related to policies, percentage                 32.50%     40.00%                          
Maximum limit of liability attaching | €                     € 10,000,000 € 5,000,000                          
Percent basis currency equivalent of maximum limit of liability attaching                       100.00%                          
Future premiums and losses related to policies, percentage                 20.00%                                
Collaborative arrangement, payment of commuted reserves   $ 31,291 € 29,401,000                                            
Collaborative arrangement, reserves expected to be commuted   27,625                                           € 25,956,000  
AmTrust Financial Services, Inc. | European Hospital Liability Quota Share | AmTrust Reinsurance legacy business                                                  
Related Party Transaction [Line Items]                                                  
Collaborative arrangement, reserves expected to be commuted, exit cost   $ 3,666 € 3,444,000                                            
AmTrust Financial Services, Inc. | Asset Management Agreement                                                  
Related Party Transaction [Line Items]                                                  
Quarterly brokerage fee, above portfolio threshold, percent of average holdings               0.02125%                                  
Cancellation notice period               30 days                                  
AmTrust Financial Services, Inc. | Asset Management Agreement | Investment Management Fee                                                  
Related Party Transaction [Line Items]                                                  
Expenses from related party transactions                               $ 2     $ 2            
AEL | AmTrust Quota Share Reinsurance Segment                                                  
Related Party Transaction [Line Items]                                                  
Percentage ceded                                                 20.00%
AEL | AmTrust European Hospital Liability Quota Share Agreement                                                  
Related Party Transaction [Line Items]                                                  
Collateral held by related party                               144,716     144,716            
Accrued interest on collateral held by related party                               $ 592     592            
Founding shareholders | AmTrust Financial Services, Inc.                                                  
Related Party Transaction [Line Items]                                                  
Controlling interest, ownership percentage 55.20%                                                
Post-Termination Endorsement, Maximum Loss Corridor | AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment                                                  
Related Party Transaction [Line Items]                                                  
Related party transaction amount (returned)           $ 40,500                                      
Investments transferred out related to Partial Termination Amendment and Commutation | AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment                                                  
Related Party Transaction [Line Items]                                                  
Percent of ceding commission payable, period increase             5.00%                                    
Post-Termination Endorsement | AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment                                                  
Related Party Transaction [Line Items]                                                  
Related party transaction, percentage of required funding on obligations           105.00%                                      
Post-Termination Endorsement | AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Maximum                                                  
Related Party Transaction [Line Items]                                                  
Related party transaction, percentage of required funding on obligations           110.00%                                      
Post-Termination Endorsement, Minimum Excess Funding Requirement | AmTrust Financial Services, Inc.                                                  
Related Party Transaction [Line Items]                                                  
Related party transaction, loan agreement, obligation threshold                                     $ 500,000            
Post-Termination Endorsement, Minimum Excess Funding Requirement | AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment                                                  
Related Party Transaction [Line Items]                                                  
Related party transaction amount (returned)           $ 54,000                                      
Post-Termination Endorsement No. 2 | AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment                                                  
Related Party Transaction [Line Items]                                                  
Related party transaction, percentage of required funding on obligations       110.00%                           107.50%              
Post-Termination Endorsement No. 2 | AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Forecast                                                  
Related Party Transaction [Line Items]                                                  
Related party transaction, percentage of required funding on obligations                             105.00%                    
Post-Termination Endorsement No. 1 | AmTrust Financial Services, Inc. | European Hospital Liability Quota Share                                                  
Related Party Transaction [Line Items]                                                  
Related party transaction, percentage of required funding on obligations       105.00% 120.00%                                        
Post-Termination Endorsement No. 1 | AmTrust Financial Services, Inc. | European Hospital Liability Quota Share | Maximum                                                  
Related Party Transaction [Line Items]                                                  
Solvency ratio       100.00%                                          
Collateral on exposure       100.00%                                          
Premium Repayment Loan Agreement | AmTrust Financial Services, Inc.                                                  
Related Party Transaction [Line Items]                                                  
Reinsurance principal amount                                           $ 24,259      
AmTrust Financial Services, Inc.                                                  
Related Party Transaction [Line Items]                                                  
Percent of ceded underwriting risk in exchange for ceding fee 100.00%                                                
Number of directors, selected by affiliate | director 3                                                
Kestrel Group, Ltd.                                                  
Related Party Transaction [Line Items]                                                  
Common shares (in shares) | shares 7,221,621                                                
Kestrel Group, Ltd. | Common shares                                                  
Related Party Transaction [Line Items]                                                  
Common shares (in shares) | shares 2,749,996                                                
AmTrust Financial Services, Inc. | Common shares | Kestrel Group, Ltd.                                                  
Related Party Transaction [Line Items]                                                  
Stock owned by shareholder (in shares) | shares                               776,470     776,470            
Maiden Reinsurance | Loan Agreement                                                  
Related Party Transaction [Line Items]                                                  
Debt instrument, principal amount                                         $ 152,377        
Maiden Reinsurance | Premium Repayment Loan Agreement | AmTrust Financial Services, Inc.                                                  
Related Party Transaction [Line Items]                                                  
Fed funds rate                                     1.50%            
KILH | Common shares | Kestrel Group, Ltd.                                                  
Related Party Transaction [Line Items]                                                  
Stock owned by shareholder (in shares) | shares                               1,811,764     1,811,764            
AmTrust North America Inc | Kestrel Group, Ltd.                                                  
Related Party Transaction [Line Items]                                                  
Minority interest                                             30.00%    
Kestrel Group | AmTrust North America Inc                                                  
Related Party Transaction [Line Items]                                                  
Acquisition option term                                     3 years            
Kestrel Group, Ltd. | AmTrust Financial Services, Inc.                                                  
Related Party Transaction [Line Items]                                                  
Ownership percentage 7.80%                                                
Kestrel Group, Ltd. | AmTrust Financial Services, Inc. | Investment Ownership, 25%                                                  
Related Party Transaction [Line Items]                                                  
Ownership percentage 25.00%                                                
Number of non-independent director | director 1                                                
Kestrel Group, Ltd. | AmTrust Financial Services, Inc. | Investment Ownership, 5%                                                  
Related Party Transaction [Line Items]                                                  
Ownership percentage 5.00%                                                
Number of independent directors | director 2                                                
Kestrel Group, Ltd. | AmTrust Financial Services, Inc. | Investment Ownership, Issued at closing of Combination                                                  
Related Party Transaction [Line Items]                                                  
Ownership percentage 25.00%                                                
Kestrel Group, Ltd. | KILH                                                  
Related Party Transaction [Line Items]                                                  
Ownership percentage 18.20%                                                
Barry Zyskind | Kestrel Group, Ltd.                                                  
Related Party Transaction [Line Items]                                                  
Ownership percentage                               4.10%     4.10%            
Stock owned by shareholder (in shares) | shares                               318,714     318,714            
Barry Zyskind | AmTrust Financial Services, Inc.                                                  
Related Party Transaction [Line Items]                                                  
Ownership percentage                               11.00%     11.00%            
Stock owned by shareholder (in shares) | shares                               1,094,754     1,094,754            
George Karfunkel | Kestrel Group, Ltd.                                                  
Related Party Transaction [Line Items]                                                  
Ownership percentage                               1.00%     1.00%            
Stock owned by shareholder (in shares) | shares                               80,000     80,000            
George Karfunkel | AmTrust Financial Services, Inc.                                                  
Related Party Transaction [Line Items]                                                  
Ownership percentage                               8.60%     8.60%            
Stock owned by shareholder (in shares) | shares                               856,040     856,040            
Leah Karfunkel | Kestrel Group, Ltd.                                                  
Related Party Transaction [Line Items]                                                  
Ownership percentage                               4.40%     4.40%            
Stock owned by shareholder (in shares) | shares                               339,630     339,630            
Leah Karfunkel | AmTrust Financial Services, Inc.                                                  
Related Party Transaction [Line Items]                                                  
Ownership percentage                               11.20%     11.20%            
Stock owned by shareholder (in shares) | shares                               1,115,670     1,115,670