Name:	argo_NetSupplementaryInsuranceInformationAmortizationDeferralOfDeferredPolicyAcquisitionCosts
Namespace Prefix:	argo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Other Underwriting Acquisition And Insurance Expenses

No definition available.

Name:	argo_OtherUnderwritingAcquisitionAndInsuranceExpenses
Namespace Prefix:	argo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Costs incurred during the period, such as those relating to general administration and policy maintenance that do not vary with and are not primarily related to the acquisition or renewal of insurance contracts, excluding amortization of deferred acquisition costs.

No definition available.

Name:	argo_UnderwritingAcquisitionAndInsuranceExpenseGross
Namespace Prefix:	argo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Costs incurred during the period related to selling the Company's products and services including the amortization of deferred policy acquisition costs charged to expense in the period, as well as other costs incurred during the period, such as those relating to general administration and policy maintenance.

No definition available.

Name:	argo_UnderwritingAcquisitionAndInsuranceExpenses
Namespace Prefix:	argo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Underwriting, Acquisition and Insurance Expenses

No definition available.

Name:	argo_UnderwritingAcquisitionAndInsuranceExpensesAbstract
Namespace Prefix:	argo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of fees incurred for commissions on mutual funds and insurance products.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14)
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260