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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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