Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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LONG-TERM OBLIGATIONS - Key Terms of Notes (Details) - American Tower Corporation - Senior notes € in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2026 USD ($)	Sep. 14, 2026 USD ($)	May 27, 2026 EUR (€)	May 27, 2026 USD ($)
Debt Instrument, Redemption Option One
Debt Instrument [Line Items]
Redemption price percentage	100.00%
4.000% senior notes
Debt Instrument [Line Items]
Contractual Interest Rate (as a percent)	4.00%		4.00%	4.00%
Aggregate Principal Amount	$ 872.0		€ 750.0	$ 872.0
5.300% senior notes
Debt Instrument [Line Items]
Contractual Interest Rate (as a percent)	5.30%	5.30%
Aggregate Principal Amount	$ 500.0	$ 500.0
5.560% senior notes
Debt Instrument [Line Items]
Contractual Interest Rate (as a percent)	5.56%	5.56%
Aggregate Principal Amount	$ 500.0	$ 500.0
5.750% senior notes
Debt Instrument [Line Items]
Contractual Interest Rate (as a percent)	5.75%	5.75%
Aggregate Principal Amount	$ 600.0	$ 600.0