XML 62 R51.htm IDEA: XBRL DOCUMENT v3.8.0.1

Variable Interest Entities - Narrative (Details)	Mar. 31, 2018 variable_interest_entity
Payables and Accruals [Abstract]
Number of Variable Interest Entities	2

X

- Definition

Number of Variable Interest Entities

+ References

No definition available.

+ Details

Name:	ahl_NumberofVariableInterestEntities
Namespace Prefix:	ahl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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