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Subsequent Events - Narrative (Details) - Maximum - Subsequent Event	Apr. 30, 2019
Subsequent Event [Line Items]
Investment company advisory service, mark-up, percent	25.00%
Annual fee cap, percent	15.00%

X

- Definition

Annual Fee Cap, Percent

+ References

No definition available.

+ Details

Name:	ahl_AnnualFeeCapPercent
Namespace Prefix:	ahl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Investment Company Advisory Service, Percent

+ References

No definition available.

+ Details

Name:	ahl_InvestmentCompanyAdvisoryServicePercent
Namespace Prefix:	ahl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: