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Statutory Accounting and Regulation (Details)	24 Months Ended
	Sep. 30, 2025
Statutory Net Income [Line Items]
Percentage of written premiums	1.00%

X

- Definition

Percentage of written premiums.

+ References

No definition available.

+ Details

Name:	acic_PercentageOfWrittenPremiums
Namespace Prefix:	acic_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Statutory Net Income [Line Items]

+ References

No definition available.

+ Details

Name:	acic_StatutoryNetIncomeLineItems
Namespace Prefix:	acic_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration