XML 53 R65.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Shareholders' Equity (Details) (USD $) | Mar. 31, 2015
--- | ---
Voting Preferred Stock [Member] |
Class of Stock [Line Items] |
Preferred Stock, par value | $ 0 us-gaap_PreferredStockNoParValue / us-gaap_StatementClassOfStockAxis = afg_VotingPreferredStockMember
Preferred Stock, shares authorized | 12,500,000.0 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = afg_VotingPreferredStockMember
Nonvoting Preferred Stock [Member] |
Class of Stock [Line Items] |
Preferred Stock, par value | $ 0 us-gaap_PreferredStockNoParValue / us-gaap_StatementClassOfStockAxis = afg_NonvotingPreferredStockMember
Preferred Stock, shares authorized | 12,500,000.0 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = afg_NonvotingPreferredStockMember

X
- Details
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
Name: | us-gaap_PreferredStockNoParValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
Name: | us-gaap_PreferredStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=afg_NonvotingPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=afg_VotingPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |