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CONSOLIDATED INCOME STATEMENTS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CONSOLIDATED INCOME STATEMENTS
Non-controlling interest, net of tax (benefit) expense	$ (2.3)	$ (0.8)	$ (0.4)

X

- Definition

Amount of current income tax expense (benefit) reported by noncontrolling interests.

+ References

No definition available.

+ Details

Name:	atni_NoncontrollingInterestIncomeTaxExpenseBenefit
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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