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LONG-TERM OBLIGATIONS - Current Portion of Long-Term Obligations (Details) € in Millions, $ in Millions	Mar. 31, 2025 USD ($)	Mar. 31, 2025 EUR (€)	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 2,816.9		$ 3,693.0
American Tower Corporation | Senior notes | 1.375% senior notes
Debt Instrument [Line Items]
Current portion of long-term obligations | €		€ 500.0
Debt interest rate (as a percent)	1.375%	1.375%
American Tower Corporation | Senior notes | 4.000% senior notes
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 750.0
Debt interest rate (as a percent)	4.00%	4.00%
American Tower Corporation | Senior notes | 1.300% senior notes
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 500.0
Debt interest rate (as a percent)	1.30%	1.30%
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 subsidiary | Secured debt | Series 2015-2 notes
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 525.0

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