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LONG-TERM OBLIGATIONS - Key Terms of Notes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 14, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Redemption price percentage	101.00%
Senior notes
Debt Instrument [Line Items]
Redemption price percentage	100.00%
American Tower Corporation
Debt Instrument [Line Items]
Debt outstanding	$ 34,533.4		$ 34,174.9
American Tower Corporation | Senior notes | 4.900% senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)	4.90%	4.90%
Debt outstanding	$ 643.9	$ 650.0	0.0
American Tower Corporation | Senior notes | 5.350% senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)	5.35%	5.35%
Debt outstanding	$ 346.1	$ 350.0	$ 0.0

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