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CONSOLIDATED INCOME STATEMENTS (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Statement [Abstract] |  |  |
Non-controlling interest, net of tax (benefit) expense | $ (3.1) | $ (2.3) | $ (0.8)

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