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Long-Term Debt (Details Textual) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Long-term Debt, Fiscal Year Maturity [Abstract]      
Scheduled principal payments on debt in 2015 $ 14,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear $ 14,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear  
Scheduled principal payments on debt in 2016 45,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo 45,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
Scheduled principal payments on debt in 2017 12,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree 12,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
Scheduled principal payments on debt in 2018 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
Scheduled principal payments on debt in 2019 350,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive 350,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Scheduled principal payments on debt in 2020 0afg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix 0afg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix  
Scheduled principal payments on debt after 2020 640,000,000afg_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearSix 640,000,000afg_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearSix  
AFG [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Revolving credit line 500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Amount borrowed under AFG revolving credit facility 0us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Interest rate description for revolving credit facility 1.00% to 1.875% (currently 1.375%) over LIBOR    
National Interstate [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Revolving credit line 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= afg_NationalInterstateMember
100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= afg_NationalInterstateMember
 
Interest rate on revolving debt facility   1.20%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= afg_NationalInterstateMember
 
Loans payable under National Interstate bank credit facility 12,000,000us-gaap_LoansPayableToBank
/ dei_LegalEntityAxis
= afg_NationalInterstateMember
12,000,000us-gaap_LoansPayableToBank
/ dei_LegalEntityAxis
= afg_NationalInterstateMember
 
Interest rate description for revolving credit facility six-month LIBOR plus 0.875% (currently 1.20%)    
9-7/8% Senior Notes due June 2019 [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Stated interest rate, percentage 9.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInJune2019Member
9.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInJune2019Member
 
9-7/8% Senior Notes due June 2019 [Member] | AFG [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Senior Notes 350,000,000us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInJune2019Member
350,000,000us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInJune2019Member
350,000,000us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInJune2019Member
6-3/8% Senior Notes due June 2042 [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Stated interest rate, percentage 6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInJune2042Member
6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInJune2042Member
 
6-3/8% Senior Notes due June 2042 [Member] | AFG [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Senior Notes 230,000,000us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInJune2042Member
230,000,000us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInJune2042Member
230,000,000us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInJune2042Member
5-3/4% Senior Notes due August 2042 [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Stated interest rate, percentage 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInAugust2042Member
5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInAugust2042Member
 
5-3/4% Senior Notes due August 2042 [Member] | AFG [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Senior Notes 125,000,000us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInAugust2042Member
125,000,000us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInAugust2042Member
125,000,000us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInAugust2042Member
7% Senior Notes due September 2050 [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Stated interest rate, percentage 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInSeptember2050Member
7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInSeptember2050Member
 
7% Senior Notes due September 2050 [Member] | AFG [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Senior Notes 132,000,000us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInSeptember2050Member
132,000,000us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInSeptember2050Member
132,000,000us-gaap_SeniorNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SeniorNotesDueInSeptember2050Member
6-1/4% Subordinated Debentures due September 2054 [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Stated interest rate, percentage 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= afg_SubordinatedDebenturesDueInSeptember2054Member
6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= afg_SubordinatedDebenturesDueInSeptember2054Member
 
6-1/4% Subordinated Debentures due September 2054 [Member] | AFG [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Subordinated Debentures $ 150,000,000us-gaap_SubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SubordinatedDebenturesDueInSeptember2054Member
$ 150,000,000us-gaap_SubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SubordinatedDebenturesDueInSeptember2054Member
$ 150,000,000us-gaap_SubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= afg_SubordinatedDebenturesDueInSeptember2054Member
LIBOR [Member] | AFG [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Interest rate on revolving debt facility   1.375%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
LIBOR [Member] | AFG [Member] | Minimum [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Interest rate on revolving debt facility   1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
LIBOR [Member] | AFG [Member] | Maximum [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Interest rate on revolving debt facility   1.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
LIBOR [Member] | National Interstate [Member] | Maximum [Member]      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Interest rate on revolving debt facility   0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= afg_NationalInterstateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember