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Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

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Related Party Transactions - AmTrust (Details) $ in Thousands														3 Months Ended			12 Months Ended
	Mar. 16, 2020 USD ($)	Aug. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Jan. 24, 2019	Jan. 11, 2019 USD ($)	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	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jul. 01, 2018	Dec. 18, 2017
Related Party Transaction [Line Items]
Loan to related party														$ 167,975			$ 167,975
Interest income														$ 18,365		$ 32,854
Founding shareholders \| AmTrust Financial Services, Inc.
Related Party Transaction [Line Items]
Controlling interest, ownership percentage														53.40%
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 Agreement
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 Agreement \| 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 Agreement \| Returned Gross Unearned Premiums
Related Party Transaction [Line Items]
Related party transaction amount															$ (647,980)
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance Agreement \| Returned Unearned Premiums, Net
Related Party Transaction [Line Items]
Related party transaction amount															$ (436,760)
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance Agreement \| Funds Withheld Arrangement
Related Party Transaction [Line Items]
Related party transaction amount					$ (575,000)									$ 575,000			575,000
Accrued interest on collateral held by related party														$ 8,873			5,073
Calculated interest rate with related party					3.50%									2.65%
Interest income from related party														$ 3,800			4,426
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance Agreement \| AmTrust Quota Shares Reinsurance Agreement, Partial Termination Amendment
Related Party Transaction [Line Items]
Percent of ceding commission payable, period increase						5.00%
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance Agreement \| 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 Agreement \| 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 Agreement \| Post-Termination Endorsement No. 2 [Member]
Related Party Transaction [Line Items]
Related party transaction, percentage of required funding on obligations	110.00%
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance Agreement \| Post-Termination Endorsement No. 2, Minimum Excess Funding Requirement [Member]
Related Party Transaction [Line Items]
Related party transaction amount	$ 54,000
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance Agreement \| Minimum
Related Party Transaction [Line Items]
Commission rate, adjustment criteria, loss ratio floor									81.50%
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance Agreement \| Maximum
Related Party Transaction [Line Items]
Commission rate, adjustment criteria, loss ratio ceiling									95.00%
AmTrust Financial Services, Inc. \| AmTrust Quota Share Reinsurance Agreement \| 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 [Member]
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														998,535			1,155,955
Accrued interest on collateral held by related party														4,897			7,366
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														234		1,977
Balance due to related party														2,139			2,372
AmTrust Financial Services, Inc. \| Asset Management Agreement
Related Party Transaction [Line Items]
Cancellation notice period													30 days
Quarterly brokerage fee, above portfolio threshold, percent of average holdings							0.02125%
AmTrust Financial Services, Inc. \| Asset Management Agreement \| Investment Management Fee
Related Party Transaction [Line Items]
Expenses from related party transactions														400		775
AEL \| AmTrust Quota Share Reinsurance Agreement
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														200,150			253,631
Accrued interest on collateral held by related party														1,696			1,821
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														74,516			57,305
Calculated interest rate with related party				0.50%
Interest income from related party														71		53
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														71			$ 269
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
Notes Receivable, Related Party
Related Party Transaction [Line Items]
Interest income														$ 1,365		$ 1,822
Effective yield														3.30%		4.30%
Maiden Holdings, Ltd. \| Leah Karfunkel
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage														8.10%
Maiden Holdings, Ltd. \| Barry Zyskind
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage														7.60%
Maiden Holdings, Ltd. \| George Karfunkel, less than 5% ownership
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage														5.00%