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Fair Value Measurements (Details 1) (Embedded derivatives [Member]) | 3 Months Ended
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Mar. 31, 2015
Unobservable inputs used by management in determining fair value of embedded derivatives |
Risk margin for uncertainty in cash flows | 0.52%afg_FairValueInputsRiskMarginForUncertaintyInCashFlows
Minimum [Member] |
Unobservable inputs used by management in determining fair value of embedded derivatives |
Adjustment for insurance subsidiary's credit risk | 0.40%us-gaap_FairValueInputsEntityCreditRisk / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Surrenders | 4.00%afg_FairValueInputsSurrenders / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Partial surrenders | 2.00%afg_FairValueInputsPartialSurrenders / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Annuitizations | 1.00%afg_FairValueInputsAnnuitizations / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Deaths | 1.50%afg_FairValueInputsDeaths / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Budgeted option costs | 2.00%afg_FairValueInputsBudgetedOptionCosts / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |
Unobservable inputs used by management in determining fair value of embedded derivatives |
Adjustment for insurance subsidiary's credit risk | 1.75%us-gaap_FairValueInputsEntityCreditRisk / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Surrenders | 16.00%afg_FairValueInputsSurrenders / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Partial surrenders | 10.00%afg_FairValueInputsPartialSurrenders / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Annuitizations | 1.50%afg_FairValueInputsAnnuitizations / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Deaths | 3.00%afg_FairValueInputsDeaths / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Budgeted option costs | 3.25%afg_FairValueInputsBudgetedOptionCosts / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Risk associated with risk of annuitizations, expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
Name: | afg_FairValueInputsAnnuitizations
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk associated with risk of budgeted option costs, expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
Name: | afg_FairValueInputsBudgetedOptionCosts
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk associated with risk of deaths, expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
Name: | afg_FairValueInputsDeaths
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Risk associated with risk of partial surrenders, expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
Name: | afg_FairValueInputsPartialSurrenders
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk associated with risk margin for uncertainty in cash flows, expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
Name: | afg_FairValueInputsRiskMarginForUncertaintyInCashFlows
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk associated with risk of surrenders, expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
Name: | afg_FairValueInputsSurrenders
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | afg_UnobservableInputsUsedInDeterminingFairValueOfEmbeddedDerivativesAbstract
Namespace Prefix: | afg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsEntityCreditRisk
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |