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CONSOLIDATED INCOME STATEMENTS (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
CONSOLIDATED INCOME STATEMENTS |  |  |
Noncontrolling interest income tax expense | $ 1.3 | $ 1.5 | $ 1.0

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

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- References No definition available. + Details
Name: | us-gaap_IncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration