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LONG-TERM OBLIGATIONS - Credit Facilities and Term Loans (Details) - American Tower Corporation $ in Millions | 6 Months Ended
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Jun. 30, 2025 USD ($) renewalPeriod
Revolving Credit Facility |
Line of Credit Facility [Line Items] |
Number of optional renewal periods | renewalPeriod | 2
2021 Multicurrency Credit Facility | Revolving Credit Facility |
Line of Credit Facility [Line Items] |
Outstanding principal balance | $ 750.0
Undrawn letters of credit | $ 6.3
Current margin over LIBOR or EURIBOR | 1.00%
Current commitment fee, percentage | 0.11%
2021 Credit Facility | Revolving Credit Facility |
Line of Credit Facility [Line Items] |
Outstanding principal balance | $ 815.0
Undrawn letters of credit | $ 29.8
Current margin over LIBOR or EURIBOR | 1.00%
Current commitment fee, percentage | 0.11%
2021 Term Loan | Unsecured debt |
Line of Credit Facility [Line Items] |
Outstanding principal balance | $ 1,000.0
Current margin over LIBOR or EURIBOR | 1.00%

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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