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Related Party Transactions - Narrative (Details)
$ in Thousands
3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Mar. 16, 2020
Aug. 31, 2019
USD ($)
Aug. 12, 2019
USD ($)
Jul. 31, 2019
USD ($)
Jan. 11, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2018
Jul. 01, 2016
Jul. 01, 2013
Jan. 01, 2012
EUR (€)
Apr. 01, 2011
EUR (€)
Jun. 11, 2008
Jul. 01, 2007
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Aug. 12, 2019
Jul. 31, 2019
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jul. 01, 2018
Dec. 31, 2014
Related Party Transaction [Line Items]                                              
Loan to related party                           $ 167,975         $ 167,975   $ 167,975    
Interest income                           8,419 $ 13,062       26,687 $ 46,090      
Notes Receivable, Related Party                                              
Related Party Transaction [Line Items]                                              
Interest income                           $ 885 $ 886       $ 2,611 $ 3,111      
Effective yield                           2.10% 2.10%       2.10% 2.50%      
Founding shareholders | AmTrust Financial Services, Inc.                                              
Related Party Transaction [Line Items]                                              
Controlling interest, ownership percentage                           53.20%         53.20%        
AmTrust Financial Services, Inc. | London Interbank Offered Rate (LIBOR)                                              
Related Party Transaction [Line Items]                                              
Basis spread on variable rate                                             2.00%
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 | Post-Termination Endorsement, Maximum Loss Corridor                                              
Related Party Transaction [Line Items]                                              
Related party transaction amount (returned)       $ 40,500                                      
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Investments transferred out related to Partial Termination Amendment and Commutation                                              
Related Party Transaction [Line Items]                                              
Percent of ceding commission payable, period increase           5.00%                                  
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Returned Gross Unearned Premiums                                              
Related Party Transaction [Line Items]                                              
Related party transaction amount (returned)                               $ 647,980              
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Returned Unearned Premiums, Net                                              
Related Party Transaction [Line Items]                                              
Related party transaction amount (returned)                               $ 436,760              
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Commutation And Release Agreement Commutation Payment                                              
Related Party Transaction [Line Items]                                              
Related party transaction amount (returned)           $ 312,786                                  
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Commutation And Release Agreement Net Ceded Reserves                                              
Related Party Transaction [Line Items]                                              
Related party transaction amount (returned)           $ 330,682                                  
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Commutation And Release Agreement Commutation Payment Paid By Entity                                              
Related Party Transaction [Line Items]                                              
Related party transaction amount (returned)                                   $ 17,896          
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Commutation And Release Agreement, Commutation Payment, Premium Interest                                              
Related Party Transaction [Line Items]                                              
Related party interest expense     $ 6,335                                        
Calculated interest rate with related party                                 3.30%            
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Investments transferred out for transactions under remaining AmTrust Quota Share business                                              
Related Party Transaction [Line Items]                                              
Related party transaction amount (returned)         $ 575,000                           $ 575,000   $ 575,000    
Calculated interest rate with related party                                     1.80%   2.65%    
Accrued interest on collateral held by related party                           $ 2,609         $ 2,609   $ 3,845    
Interest income from related party                           2,609 $ 3,845       7,741 $ 11,451      
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Post-Termination Endorsement                                              
Related Party Transaction [Line Items]                                              
Related party transaction, percentage of required funding on obligations       105.00%                                      
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Post-Termination Endorsement, Minimum Excess Funding Requirement                                              
Related Party Transaction [Line Items]                                              
Related party transaction amount (returned)       $ 54,000                                      
AmTrust Financial Services, Inc. | AmTrust Quota Share Reinsurance Segment | Post-Termination Endorsement No. 2                                              
Related Party Transaction [Line Items]                                              
Related party transaction, percentage of required funding on obligations 110.00%                                            
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. | AmTrust Quota Share Reinsurance Segment | Maximum | Post-Termination Endorsement                                              
Related Party Transaction [Line Items]                                              
Related party transaction, percentage of required funding on obligations       110.00%                                      
AmTrust Financial Services, Inc. | European Hospital Liability Quota Share Agreement                                              
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 (in EUR) | €                   € 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%                              
AmTrust Financial Services, Inc. | European Hospital Liability Quota Share Agreement | Maximum | Post-Termination Endorsement No. 1                                              
Related Party Transaction [Line Items]                                              
Related party transaction, percentage of required funding on obligations 120.00%                                            
Solvency ratio 100.00%                                            
Collateral on exposure 100.00%                                            
AmTrust Financial Services, Inc. | Reinsurer Trust Assets Collateral Agreement                                              
Related Party Transaction [Line Items]                                              
Collateral held by related party                           328,891         328,891   666,879    
Accrued interest on collateral held by related party                           1,893         1,893   3,048    
AmTrust Financial Services, Inc. | Reinsurance Brokerage Agreements                                              
Related Party Transaction [Line Items]                                              
Brokerage fee, percent of premium assumed                         1.25%                    
AmTrust Financial Services, Inc. | Reinsurance Brokerage Agreements | Brokerage expense                                              
Related Party Transaction [Line Items]                                              
Expenses from related party transactions                           94 162       242 515      
Balance due to related party                           1,253         1,253   1,534    
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                           196 321       690 1,071      
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                           286,118         286,118   318,063    
Accrued interest on collateral held by related party                           1,577         1,577   2,283    
AmTrust International Underwriters DAC (AIU) | AmTrust European Hospital Liability Quota Share Agreement | Collateral Provided For Share Under Quota Share Agreement                                              
Related Party Transaction [Line Items]                                              
Related party transaction amount (returned)                                     $ 28,734   28,093    
Calculated interest rate with related party                                     0.50%        
Interest income from related party                           37 64       $ 111 262      
AmTrust International Underwriters DAC (AIU) | AmTrust European Hospital Liability Quota Share Agreement | Accrued Interest On Collateral Provided For Share Under Quota Share Agreement                                              
Related Party Transaction [Line Items]                                              
Related party transaction amount (returned)                                     107   318    
Risk Services - Vermont, Inc. | Insurance Management Services Agreement                                              
Related Party Transaction [Line Items]                                              
Cancellation notice period   3 months                                          
Agreement initial term   3 years                                          
Renewal term   3 years                                          
Risk Services - Vermont, Inc. | Insurance Management Services Agreement, Initial Retainer                                              
Related Party Transaction [Line Items]                                              
Expenses from related party transactions   $ 100                                          
Risk Services - Vermont, Inc. | Insurance Management Services Agreement, Fees                                              
Related Party Transaction [Line Items]                                              
Expenses from related party transactions   $ 100                       $ 25 $ 25       75 $ 75      
Affiliated Entity | Limited Partnership Agreement | 683 Capital Management, LLC                                              
Related Party Transaction [Line Items]                                              
Related party transaction amount (returned)                                     $ 31,221   $ 29,435    
Maiden Holdings, Ltd. | Leah Karfunkel                                              
Related Party Transaction [Line Items]                                              
Noncontrolling interest, ownership percentage                           7.80%         7.80%        
Maiden Holdings, Ltd. | Barry Zyskind                                              
Related Party Transaction [Line Items]                                              
Noncontrolling interest, ownership percentage                           7.30%         7.30%        
Maiden Holdings, Ltd. | George Karfunkel, less than 5% ownership                                              
Related Party Transaction [Line Items]                                              
Noncontrolling interest, ownership percentage                           5.00%         5.00%        
Maiden Holdings, Ltd. | Affiliated Entity | 683 Capital Partners, LP                                              
Related Party Transaction [Line Items]                                              
Noncontrolling interest, ownership percentage                           6.80%         6.80%