| | | | | | | | | | | | | | | | | | | | | |
<?xml version="1.0" encoding="windows-1252"?> |
<FilingSummary> |
| <Version> 3.23.3 </Version> |
| <ProcessingTime/> |
| <ReportFormat> html </ReportFormat> |
| <ContextCount> 190 </ContextCount> |
| <ElementCount> 284 </ElementCount> |
| <EntityCount> 1 </EntityCount> |
| <FootnotesReported> true </FootnotesReported> |
| <SegmentCount> 47 </SegmentCount> |
| <ScenarioCount> 0 </ScenarioCount> |
| <TuplesReported> false </TuplesReported> |
| <UnitCount> 9 </UnitCount> |
| <MyReports> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R1.htm </HtmlFileName> |
| | | <LongName> 000100 - Document - Document and Entity Information </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/DocumentAndEntityInformation </Role> |
| | | <ShortName> Document and Entity Information </ShortName> |
| | | <MenuCategory> Cover </MenuCategory> |
| | | <Position> 1 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R2.htm </HtmlFileName> |
| | | <LongName> 010000 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/CondensedConsolidatedBalanceSheets </Role> |
| | | <ShortName> CONDENSED CONSOLIDATED BALANCE SHEETS </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 2 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R3.htm </HtmlFileName> |
| | | <LongName> 010100 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/CondensedConsolidatedBalanceSheetsParenthetical </Role> |
| | | <ShortName> CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 3 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R4.htm </HtmlFileName> |
| | | <LongName> 020000 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/CondensedConsolidatedStatementsOfOperations </Role> |
| | | <ShortName> CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 4 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R5.htm </HtmlFileName> |
| | | <LongName> 030000 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/CondensedConsolidatedStatementsOfComprehensiveLoss </Role> |
| | | <ShortName> CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 5 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R6.htm </HtmlFileName> |
| | | <LongName> 040000 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/CondensedConsolidatedStatementsOfShareholdersEquity </Role> |
| | | <ShortName> CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 6 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R7.htm </HtmlFileName> |
| | | <LongName> 050000 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/CondensedConsolidatedStatementsOfCashFlows </Role> |
| | | <ShortName> CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 7 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R8.htm </HtmlFileName> |
| | | <LongName> 060100 - Disclosure - Basis of Presentation and Significant Accounting Policies </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/BasisOfPresentationAndSignificantAccountingPolicies </Role> |
| | | <ShortName> Basis of Presentation and Significant Accounting Policies </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 8 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R9.htm </HtmlFileName> |
| | | <LongName> 060200 - Disclosure - Recently Issued Accounting Standards </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/RecentlyIssuedAccountingStandards </Role> |
| | | <ShortName> Recently Issued Accounting Standards </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 9 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R10.htm </HtmlFileName> |
| | | <LongName> 060300 - Disclosure - Investments </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/Investments </Role> |
| | | <ShortName> Investments </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 10 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R11.htm </HtmlFileName> |
| | | <LongName> 060400 - Disclosure - Fair Values of Financial Instruments </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/FairValuesOfFinancialInstruments </Role> |
| | | <ShortName> Fair Values of Financial Instruments </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 11 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R12.htm </HtmlFileName> |
| | | <LongName> 060500 - Disclosure - Internal-Use Software </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/InternaluseSoftware </Role> |
| | | <ShortName> Internal-Use Software </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 12 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R13.htm </HtmlFileName> |
| | | <LongName> 060600 - Disclosure - Insurance Reserves for Losses and Claims </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/InsuranceReservesForLossesAndClaims </Role> |
| | | <ShortName> Insurance Reserves for Losses and Claims </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 13 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R14.htm </HtmlFileName> |
| | | <LongName> 060700 - Disclosure - Credit Arrangements </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/CreditArrangements </Role> |
| | | <ShortName> Credit Arrangements </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 14 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R15.htm </HtmlFileName> |
| | | <LongName> 060800 - Disclosure - Earnings (Loss) Per Common Share </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/EarningsLossPerCommonShare </Role> |
| | | <ShortName> Earnings (Loss) Per Common Share </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 15 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R16.htm </HtmlFileName> |
| | | <LongName> 060900 - Disclosure - Income Taxes </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/IncomeTaxes </Role> |
| | | <ShortName> Income Taxes </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 16 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R17.htm </HtmlFileName> |
| | | <LongName> 061000 - Disclosure - Leases </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/Leases </Role> |
| | | <ShortName> Leases </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 17 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R18.htm </HtmlFileName> |
| | | <LongName> 061100 - Disclosure - Commitments and Contingencies </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/CommitmentsAndContingencies </Role> |
| | | <ShortName> Commitments and Contingencies </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 18 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R19.htm </HtmlFileName> |
| | | <LongName> 061200 - Disclosure - Segment Information </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/SegmentInformation </Role> |
| | | <ShortName> Segment Information </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 19 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R20.htm </HtmlFileName> |
| | | <LongName> 070200 - Disclosure - Recently Issued Accounting Standards (Policies) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/RecentlyIssuedAccountingStandardsPolicies </Role> |
| | | <ShortName> Recently Issued Accounting Standards (Policies) </ShortName> |
| | | <MenuCategory> Policies </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/BasisOfPresentationAndSignificantAccountingPolicies </ParentRole> |
| | | <Position> 20 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R21.htm </HtmlFileName> |
| | | <LongName> 080200 - Disclosure - Recently Issued Accounting Standards (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/RecentlyIssuedAccountingStandardsTables </Role> |
| | | <ShortName> Recently Issued Accounting Standards (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/RecentlyIssuedAccountingStandards </ParentRole> |
| | | <Position> 21 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R22.htm </HtmlFileName> |
| | | <LongName> 080300 - Disclosure - Investments (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/InvestmentsTables </Role> |
| | | <ShortName> Investments (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/Investments </ParentRole> |
| | | <Position> 22 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R23.htm </HtmlFileName> |
| | | <LongName> 080400 - Disclosure - Fair Values of Financial Instruments (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/FairValuesOfFinancialInstrumentsTables </Role> |
| | | <ShortName> Fair Values of Financial Instruments (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/FairValuesOfFinancialInstruments </ParentRole> |
| | | <Position> 23 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R24.htm </HtmlFileName> |
| | | <LongName> 080600 - Disclosure - Insurance Reserves for Losses and Claims (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/InsuranceReservesForLossesAndClaimsTables </Role> |
| | | <ShortName> Insurance Reserves for Losses and Claims (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/InsuranceReservesForLossesAndClaims </ParentRole> |
| | | <Position> 24 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R25.htm </HtmlFileName> |
| | | <LongName> 080700 - Disclosure - Credit Arrangements (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/CreditArrangementsTables </Role> |
| | | <ShortName> Credit Arrangements (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/CreditArrangements </ParentRole> |
| | | <Position> 25 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R26.htm </HtmlFileName> |
| | | <LongName> 080800 - Disclosure - Earnings (Loss) Per Common Share (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/EarningsLossPerCommonShareTables </Role> |
| | | <ShortName> Earnings (Loss) Per Common Share (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/EarningsLossPerCommonShare </ParentRole> |
| | | <Position> 26 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R27.htm </HtmlFileName> |
| | | <LongName> 080900 - Disclosure - Income Taxes (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/IncomeTaxesTables </Role> |
| | | <ShortName> Income Taxes (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/IncomeTaxes </ParentRole> |
| | | <Position> 27 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R28.htm </HtmlFileName> |
| | | <LongName> 081000 - Disclosure - Leases (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/LeasesTables </Role> |
| | | <ShortName> Leases (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/Leases </ParentRole> |
| | | <Position> 28 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R29.htm </HtmlFileName> |
| | | <LongName> 081200 - Disclosure - Segment Information (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/SegmentInformationTables </Role> |
| | | <ShortName> Segment Information (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/SegmentInformation </ParentRole> |
| | | <Position> 29 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R30.htm </HtmlFileName> |
| | | <LongName> 090100 - Disclosure - Basis of Presentation and Significant Accounting Policies (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/BasisOfPresentationAndSignificantAccountingPoliciesDetails </Role> |
| | | <ShortName> Basis of Presentation and Significant Accounting Policies (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 30 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R31.htm </HtmlFileName> |
| | | <LongName> 090200 - Disclosure - Recently Issued Accounting Standards, Reinsurance Recoverables (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/RecentlyIssuedAccountingStandardsReinsuranceRecoverablesDetails </Role> |
| | | <ShortName> Recently Issued Accounting Standards, Reinsurance Recoverables (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 31 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R32.htm </HtmlFileName> |
| | | <LongName> 090202 - Disclosure - Recently Issued Accounting Standards, Insurance Premium and Other Receivables (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/RecentlyIssuedAccountingStandardsInsurancePremiumAndOtherReceivablesDetails </Role> |
| | | <ShortName> Recently Issued Accounting Standards, Insurance Premium and Other Receivables (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 32 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R33.htm </HtmlFileName> |
| | | <LongName> 090300 - Disclosure - Investments, Aggregated by Type and Industry (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/InvestmentsAggregatedByTypeAndIndustryDetails </Role> |
| | | <ShortName> Investments, Aggregated by Type and Industry (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 33 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R34.htm </HtmlFileName> |
| | | <LongName> 090302 - Disclosure - Investments, Fixed Maturities by Contractual Maturities (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/InvestmentsFixedMaturitiesByContractualMaturitiesDetails </Role> |
| | | <ShortName> Investments, Fixed Maturities by Contractual Maturities (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 34 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R35.htm </HtmlFileName> |
| | | <LongName> 090304 - Disclosure - Investments, Securities with Continuous Unrealized Loss Position (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/InvestmentsSecuritiesWithContinuousUnrealizedLossPositionDetails </Role> |
| | | <ShortName> Investments, Securities with Continuous Unrealized Loss Position (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 35 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R36.htm </HtmlFileName> |
| | | <LongName> 090306 - Disclosure - Investments, Summary of Realized Investment Gains (Losses) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/InvestmentsSummaryOfRealizedInvestmentGainsLossesDetails </Role> |
| | | <ShortName> Investments, Summary of Realized Investment Gains (Losses) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 36 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R37.htm </HtmlFileName> |
| | | <LongName> 090308 - Disclosure - Investments, Unrealized Gains (Losses) on Equity Securities (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/InvestmentsUnrealizedGainsLossesOnEquitySecuritiesDetails </Role> |
| | | <ShortName> Investments, Unrealized Gains (Losses) on Equity Securities (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 37 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R38.htm </HtmlFileName> |
| | | <LongName> 090310 - Disclosure - Investments, Variable Interest Entities (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/InvestmentsVariableInterestEntitiesDetails </Role> |
| | | <ShortName> Investments, Variable Interest Entities (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 38 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R39.htm </HtmlFileName> |
| | | <LongName> 090400 - Disclosure - Fair Values of Financial Instruments, Measured on a Recurring Basis (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/FairValuesOfFinancialInstrumentsMeasuredOnRecurringBasisDetails </Role> |
| | | <ShortName> Fair Values of Financial Instruments, Measured on a Recurring Basis (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 39 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R40.htm </HtmlFileName> |
| | | <LongName> 090402 - Disclosure - Fair Values of Financial Instruments, Estimated Fair Value and Level (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/FairValuesOfFinancialInstrumentsEstimatedFairValueAndLevelDetails </Role> |
| | | <ShortName> Fair Values of Financial Instruments, Estimated Fair Value and Level (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 40 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R41.htm </HtmlFileName> |
| | | <LongName> 090500 - Disclosure - Internal-Use Software (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/InternaluseSoftwareDetails </Role> |
| | | <ShortName> Internal-Use Software (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/InternaluseSoftware </ParentRole> |
| | | <Position> 41 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R42.htm </HtmlFileName> |
| | | <LongName> 090600 - Disclosure - Insurance Reserves for Losses and Claims (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/InsuranceReservesForLossesAndClaimsDetails </Role> |
| | | <ShortName> Insurance Reserves for Losses and Claims (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/InsuranceReservesForLossesAndClaimsTables </ParentRole> |
| | | <Position> 42 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R43.htm </HtmlFileName> |
| | | <LongName> 090700 - Disclosure - Credit Arrangements, Bank Debt (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/CreditArrangementsBankDebtDetails </Role> |
| | | <ShortName> Credit Arrangements, Bank Debt (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 43 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R44.htm </HtmlFileName> |
| | | <LongName> 090702 - Disclosure - Credit Arrangements, Junior Subordinated Debentures (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/CreditArrangementsJuniorSubordinatedDebenturesDetails </Role> |
| | | <ShortName> Credit Arrangements, Junior Subordinated Debentures (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 44 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R45.htm </HtmlFileName> |
| | | <LongName> 090800 - Disclosure - Earnings (Loss) Per Common Share (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/EarningsLossPerCommonShareDetails </Role> |
| | | <ShortName> Earnings (Loss) Per Common Share (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/EarningsLossPerCommonShareTables </ParentRole> |
| | | <Position> 45 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R46.htm </HtmlFileName> |
| | | <LongName> 090900 - Disclosure - Income Taxes (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/IncomeTaxesDetails </Role> |
| | | <ShortName> Income Taxes (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/IncomeTaxesTables </ParentRole> |
| | | <Position> 46 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R47.htm </HtmlFileName> |
| | | <LongName> 091000 - Disclosure - Leases (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/LeasesDetails </Role> |
| | | <ShortName> Leases (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/LeasesTables </ParentRole> |
| | | <Position> 47 </Position> |
| | | </Report> |
| | <Report instance="ef20012318_10q.htm"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R48.htm </HtmlFileName> |
| | | <LongName> 091200 - Disclosure - Segment Information (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://atlam.com/role/SegmentInformationDetails </Role> |
| | | <ShortName> Segment Information (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://atlam.com/role/SegmentInformationTables </ParentRole> |
| | | <Position> 48 </Position> |
| | | </Report> |
| | <Report> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <LongName> All Reports </LongName> |
| | | <ReportType> Book </ReportType> |
| | | <ShortName> All Reports </ShortName> |
| | | </Report> |
| | </MyReports> |
| <InputFiles> |
| | <File> aame-20230930.xsd </File> |
| | <File> aame-20230930_cal.xml </File> |
| | <File> aame-20230930_def.xml </File> |
| | <File> aame-20230930_lab.xml </File> |
| | <File> aame-20230930_pre.xml </File> |
| | <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="ef20012318_10q.htm"> ef20012318_10q.htm </File> |
| | </InputFiles> |
| <SupplementalFiles/> |
| <BaseTaxonomies> |
| | <BaseTaxonomy items="878"> http://fasb.org/us-gaap/2023 </BaseTaxonomy> |
| | <BaseTaxonomy items="29"> http://xbrl.sec.gov/dei/2023 </BaseTaxonomy> |
| | </BaseTaxonomies> |
| <HasPresentationLinkbase> true </HasPresentationLinkbase> |
| <HasCalculationLinkbase> true </HasCalculationLinkbase> |
| </FilingSummary> |