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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_
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Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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