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LONG-TERM OBLIGATIONS - Repayments of Senior Notes (Details) - American Tower Corporation - USD ($) $ in Millions	Mar. 14, 2025	Jan. 14, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Long-term debt			$ 34,533.4	$ 34,174.9
2.950% senior notes | Senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)		2.95%		2.95%
Aggregate principal amount		$ 650.0
Long-term debt			0.0	$ 650.0
2.400% senior notes | Senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)	2.40%			2.40%
Aggregate principal amount	$ 750.0
Long-term debt			$ 0.0	$ 749.7
4.900% senior notes | Senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)	4.90%		4.90%
Long-term debt	$ 650.0		$ 643.9	0.0
5.350% senior notes | Senior notes
Debt Instrument [Line Items]
Debt interest rate (as a percent)	5.35%		5.35%
Long-term debt	$ 350.0		$ 346.1	$ 0.0

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