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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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