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Related Party Transactions - Narrative (Details) $ in Thousands															3 Months Ended			6 Months Ended		7 Months Ended		12 Months Ended
	Mar. 16, 2020	Aug. 31, 2019 USD ($)	Aug. 12, 2019 USD ($)	Jul. 31, 2019 USD ($)	Jul. 01, 2019 USD ($)	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	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Aug. 12, 2019	Jul. 31, 2019 USD ($)	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															8,083	$ 14,663		18,268	$ 33,028
Notes Receivable, Related Party
Related Party Transaction [Line Items]
Interest income															$ 866	$ 860		$ 1,726	$ 2,225
Effective yield															2.10%	2.00%		2.10%	2.60%
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				$ 40,500
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance Segment \| Returned Gross Unearned Premiums
Related Party Transaction [Line Items]
Related party transaction amount																	$ (647,980)
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 Unearned Premiums, Net
Related Party Transaction [Line Items]
Related party transaction amount																	$ (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					$ 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							$ 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																					$ 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						$ (575,000)												$ 575,000				575,000
Accrued interest on collateral held by related party															$ 2,580			$ 2,580				$ 3,845
Calculated interest rate with related party																		1.80%				2.65%
Interest income from related party															2,580	$ 3,806		$ 5,132	$ 7,606
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				$ 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															425,953			425,953				$ 666,879
Accrued interest on collateral held by related party															1,937			1,937				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															79	119		148	353
Balance due to related party															1,333			1,333				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															222	350		494	750
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															334,038			334,038				318,063
Accrued interest on collateral held by related party															2,227			2,227				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																		$ 29,424				28,093
Calculated interest rate with related party																		0.50%
Interest income from related party															37	127		$ 74	198
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																		73				$ 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		50	$ 50
Affiliated Entity \| Limited Partnership Agreement \| 683 Capital Management, LLC
Related Party Transaction [Line Items]
Related party transaction amount																		$ 33,058
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%