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LONG-TERM OBLIGATIONS - Key Terms of Notes (Details) € in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 16, 2025 USD ($)	May 30, 2025 USD ($)	May 30, 2025 EUR (€)	Mar. 14, 2025 USD ($)
Debt Instrument [Line Items]
Redemption price percentage	101.00%
Senior notes
Debt Instrument [Line Items]
Redemption price percentage	100.00%
American Tower Corporation | Senior notes | 4.900% senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)	4.90%	4.90%
Aggregate Principal Amount		$ 850.0
American Tower Corporation | Senior notes | Initial 4.900% senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)					4.90%
Aggregate Principal Amount					$ 650.0
American Tower Corporation | Senior notes | Reopened 4.900% senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)		4.90%
Aggregate Principal Amount		$ 200.0
American Tower Corporation | Senior notes | 5.350% senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)	5.35%	5.35%
Aggregate Principal Amount		$ 725.0
American Tower Corporation | Senior notes | Initial 5.350% senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)					5.35%
Aggregate Principal Amount					$ 350.0
American Tower Corporation | Senior notes | Reopened 5.350% senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)		5.35%
Aggregate Principal Amount		$ 375.0
American Tower Corporation | Senior notes | 3.625% senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)	3.625%		3.625%	3.625%
Aggregate Principal Amount			$ 567.4	€ 500.0

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