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LONG-TERM OBLIGATIONS - Current Portion of Long-Term Obligations (Details) € in Millions, $ in Millions	Sep. 30, 2025 USD ($)	Sep. 30, 2025 EUR (€)	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 2,387.7		$ 3,693.0
American Tower Corporation | Senior notes | 4.400% senior notes
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 500.0
Debt interest rate (as a percent)	4.40%	4.40%
American Tower Corporation | Senior notes | 1.600% senior notes
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 700.0
Debt interest rate (as a percent)	1.60%	1.60%
American Tower Corporation | Senior notes | 1.950% senior notes
Debt Instrument [Line Items]
Current portion of long-term obligations | €		€ 500.0
Debt interest rate (as a percent)	1.95%	1.95%
American Tower Corporation | Senior notes | 1.450% senior notes
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 600.0
Debt interest rate (as a percent)	1.45%	1.45%

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