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LONG-TERM OBLIGATIONS - Bank Facilities (Details) € in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 EUR (€)	Sep. 30, 2024 USD ($)	Sep. 12, 2025	May 30, 2025	Apr. 03, 2025	Jan. 28, 2025 USD ($)	Jan. 14, 2025	Dec. 31, 2024
Line of Credit Facility [Line Items]
Borrowings under credit facilities	$ 5,307.3		$ 6,147.9
American Tower Corporation | 2021 Term Loan | Unsecured debt
Line of Credit Facility [Line Items]
Aggregate principal 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 | 1.375% senior notes | Senior notes
Line of Credit Facility [Line Items]
Debt interest rate (as a percent)						1.375%			1.375%
American Tower Corporation | 4.000% senior notes | Senior notes
Line of Credit Facility [Line Items]
Debt interest rate (as a percent)					4.00%				4.00%
American Tower Corporation | 1.300% senior notes | Senior notes
Line of Credit Facility [Line Items]
Debt interest rate (as a percent)				1.30%					1.30%
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	2,400.0
Repayment of indebtedness under credit facility	2,000.0
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	2,900.0
Repayment of indebtedness under credit facility	2,100.0
American Tower Corporation | Revolving Credit Facility | 2021 Multicurrency Credit Facility In Euros
Line of Credit Facility [Line Items]
Borrowings under credit facilities	529.1	€ 492.0
Repayment of indebtedness under credit facility	$ 549.9	€ 492.0

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