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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS |  |
Non-controlling interest income tax expense (benefit) | $ (0.6) | $ (0.5)

X
- Definition Amount of current income tax expense (benefit) reported by noncontrolling interests. + References No definition available. + Details
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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