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Investment Information - Restricted assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Restricted Assets [Line Items]
Restricted assets	$ 8,503,071	$ 8,249,732
Collateral or guarantees - affiliated transactions
Restricted Assets [Line Items]
Restricted assets	4,202,190	4,223,955
Collateral or guarantees - third party agreements
Restricted Assets [Line Items]
Restricted assets	3,018,035	2,721,160
Deposits with US regulatory authorities
Restricted Assets [Line Items]
Restricted assets	773,105	798,100
Deposits with non-US regulatory authorities
Restricted Assets [Line Items]
Restricted assets	$ 509,741	$ 506,517

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- Definition

Assets, consisting primarily of fixed maturities, that the Company is required to maintain with various regulatory authorities to support its insurance and reinsurance operations. The Company's insurance and reinsurance subsidiaries maintain assets in trust accounts as collateral for insurance and reinsurance transactions with affiliated companies and also have investments in segregated portfolios primarily to provide collateral or guarantees for letters of credit to third parties.

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No definition available.

+ Details

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Namespace Prefix:	acgl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Balance Type:
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X

- Details

Name:	acgl_RestrictedAssetsRestrictionTypeAxis=acgl_CollateralOrGuaranteesThirdPartyAgreementsMember
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Balance Type:
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X

- Details

Name:	acgl_RestrictedAssetsRestrictionTypeAxis=acgl_DepositsWithUsRegulatoryAuthoritiesMember
Namespace Prefix:
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X

- Details

Name:	acgl_RestrictedAssetsRestrictionTypeAxis=acgl_DepositsWithNonUsRegulatoryAuthoritiesMember
Namespace Prefix:
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Period Type: