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v3.21.1

Subsequent Events - Narrative (Details) - USD ($) | Apr. 01, 2021 | Mar. 27, 2017
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Subsequent Event [Line Items] |  |
Line of credit facility, maximum borrowing capacity |  | $ 200,000,000
Subsequent Event | Aspen Specialty | Federal Home Loan Bank of Boston |  |
Subsequent Event [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 98,000,000 |
Subsequent Event | AAIC | Federal Home Loan Bank of Boston |  |
Subsequent Event [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 97,000,000 |
Percentage limit of pledged assets permitted to secure debt obligations | 10.00% |

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- Definition Percentage limit of reserve assets permitted to secure debt obligations + References No definition available. + Details
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Namespace Prefix: | ahl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Balance Type: | na
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- Details
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Namespace Prefix: |
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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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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |