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Fair Value Measurements - Pricing Sources Used in Pricing Fixed Income Investments (Details)	Dec. 31, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Index providers	84.00%	87.00%
Pricing services	11.00%	7.00%
Broker-dealers	5.00%	6.00%
Total	100.00%	100.00%

X

- Definition

Fixed income investments brokers dealers.

+ References

No definition available.

+ Details

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X

- Definition

Fixed income investments index providers.

+ References

No definition available.

+ Details

Name:	ahl_FixedIncomeInvestmentsIndexProviders
Namespace Prefix:	ahl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fixed income investments pricing services.

+ References

No definition available.

+ Details

Name:	ahl_FixedIncomeInvestmentsPricingServices
Namespace Prefix:	ahl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Total pricing sources used in pricing fixed income investments.

+ References

No definition available.

+ Details

Name:	ahl_PricingSourcesUsedInPricingFixedIncomeInvestments
Namespace Prefix:	ahl_
Data Type:	num:percentItemType
Balance Type:	na
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X

- References

No definition available.

+ Details

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