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Fair Value Measurements - Unobservable inputs used in determining fair value of embedded derivatives (Details) - Embedded derivatives | 12 Months Ended
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Dec. 31, 2019
Unobservable inputs used by management in determining fair value of embedded derivatives |
Risk margin for uncertainty in cash flows | 0.80%
Minimum |
Unobservable inputs used by management in determining fair value of embedded derivatives |
Fair Value Input Adjustment for Insurance Subsidiary’s Credit Risk | 0.20%
Surrenders | 3.00%
Partial surrenders | 2.00%
Annuitizations | 0.10%
Deaths | 1.50%
Budgeted option costs | 2.50%
Maximum |
Unobservable inputs used by management in determining fair value of embedded derivatives |
Fair Value Input Adjustment for Insurance Subsidiary’s Credit Risk | 2.40%
Surrenders | 22.00%
Partial surrenders | 9.00%
Annuitizations | 1.00%
Deaths | 10.60%
Budgeted option costs | 3.30%

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

X
- 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

X
- 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
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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

X
- Definition Unobservable inputs used in determining fair value of embedded derivatives. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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- Details
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