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LONG-TERM OBLIGATIONS - Bank Facilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Jan. 28, 2025	Jan. 14, 2025	Dec. 31, 2024
Line of Credit Facility [Line Items]
Borrowings under credit facilities	$ 850.0	$ 2,790.5
American Tower Corporation | 2021 Term Loan | Unsecured debt
Line of Credit Facility [Line Items]
Debt face amount			$ 1,000.0
American Tower Corporation | 2.950% senior notes | Senior notes
Line of Credit Facility [Line Items]
Debt interest rate (as a percent)				2.95%	2.95%
American Tower Corporation | Revolving Credit Facility | 2021 Multicurrency Credit Facility
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity			6,000.0
Borrowings under credit facilities	240.0
Repayment of indebtedness under credit facility	190.0
American Tower Corporation | Revolving Credit Facility | 2021 Credit Facility
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity			$ 4,000.0
Borrowings under credit facilities	610.0
Repayment of indebtedness under credit facility	$ 250.0

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