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LONG-TERM OBLIGATIONS (Tables) | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Long-Term Debt Instruments | Outstanding amounts under the Company’s long-term obligations, reflecting discounts, premiums and debt issuance costs, consisted of the following:
| As of |  |
| September 30, 2025 |  | December 31, 2024 |  | Maturity Date
2021 Multicurrency Credit Facility (1) | $ | 445.0 |  |  | $ | — |  |  | January 28, 2028
2021 Term Loan (1) | 997.9 |  |  | 997.9 |  |  | January 28, 2028
2021 Credit Facility (1) | 815.0 |  |  | — |  |  | January 28, 2030
2.950% senior notes (2) | — |  |  | 650.0 |  |  | N/A
2.400% senior notes (3) | — |  |  | 749.7 |  |  | N/A
1.375% senior notes (4) (5) | — |  |  | 517.3 |  |  | N/A
4.000% senior notes (6) | — |  |  | 749.4 |  |  | N/A
1.300% senior notes (7) | — |  |  | 499.3 |  |  | N/A
4.400% senior notes | 499.8 |  |  | 499.3 |  |  | February 15, 2026
1.600% senior notes | 699.4 |  |  | 698.5 |  |  | April 15, 2026
1.950% senior notes (5) | 586.0 |  |  | 516.4 |  |  | May 22, 2026
1.450% senior notes | 598.5 |  |  | 597.4 |  |  | September 15, 2026
3.375% senior notes | 998.0 |  |  | 996.6 |  |  | October 15, 2026
3.125% senior notes | 399.5 |  |  | 399.3 |  |  | January 15, 2027
2.750% senior notes | 748.7 |  |  | 748.0 |  |  | January 15, 2027
0.450% senior notes (5) | 878.5 |  |  | 774.1 |  |  | January 15, 2027
0.400% senior notes (5) | 585.0 |  |  | 515.0 |  |  | February 15, 2027
3.650% senior notes | 647.6 |  |  | 646.4 |  |  | March 15, 2027
4.125% senior notes (5) | 702.1 |  |  | 618.5 |  |  | May 16, 2027
3.55% senior notes | 748.5 |  |  | 747.9 |  |  | July 15, 2027
3.600% senior notes | 697.7 |  |  | 697.0 |  |  | January 15, 2028
0.500% senior notes (5) | 877.1 |  |  | 772.6 |  |  | January 15, 2028
1.500% senior notes | 648.3 |  |  | 647.8 |  |  | January 31, 2028
5.500% senior notes | 696.1 |  |  | 695.0 |  |  | March 15, 2028
5.250% senior notes | 646.1 |  |  | 645.2 |  |  | July 15, 2028
5.800% senior notes | 745.5 |  |  | 744.6 |  |  | November 15, 2028
5.200% senior notes | 644.8 |  |  | 643.7 |  |  | February 15, 2029
3.950% senior notes | 595.7 |  |  | 594.8 |  |  | March 15, 2029
0.875% senior notes (5) | 877.1 |  |  | 773.0 |  |  | May 21, 2029
3.800% senior notes | 1,641.9 |  |  | 1,640.5 |  |  | August 15, 2029
2.900% senior notes | 745.8 |  |  | 745.1 |  |  | January 15, 2030
5.000% senior notes | 594.1 |  |  | 593.2 |  |  | January 31, 2030
4.900% senior notes | 847.9 |  |  | — |  |  | March 15, 2030
3.900% senior notes (5) | 582.4 |  |  | 512.9 |  |  | May 16, 2030
2.100% senior notes | 744.9 |  |  | 744.1 |  |  | June 15, 2030
0.950% senior notes (5) | 582.1 |  |  | 512.6 |  |  | October 5, 2030
1.875% senior notes | 795.0 |  |  | 794.3 |  |  | October 15, 2030
2.700% senior notes | 696.1 |  |  | 695.6 |  |  | April 15, 2031
4.625% senior notes (5) | 581.3 |  |  | 511.7 |  |  | May 16, 2031
2.300% senior notes | 694.3 |  |  | 693.6 |  |  | September 15, 2031
1.000% senior notes (5) | 757.9 |  |  | 667.6 |  |  | January 15, 2032
4.050% senior notes | 644.2 |  |  | 643.7 |  |  | March 15, 2032
3.625% senior notes (5) | 583.2 |  |  | — |  |  | May 30, 2032
5.650% senior notes | 792.1 |  |  | 791.4 |  |  | March 15, 2033
1.250% senior notes (5) | 581.6 |  |  | 512.1 |  |  | May 21, 2033
5.550% senior notes | 842.0 |  |  | 841.4 |  |  | July 15, 2033
5.900% senior notes | 742.7 |  |  | 742.2 |  |  | November 15, 2033
5.450% senior notes | 641.2 |  |  | 640.6 |  |  | February 15, 2034
4.100% senior notes (5) | 580.0 |  |  | 510.5 |  |  | May 16, 2034
5.400% senior notes | 592.4 |  |  | 591.9 |  |  | January 31, 2035
5.350% senior notes | 731.5 |  |  | — |  |  | March 15, 2035
3.700% senior notes | 592.7 |  |  | 592.6 |  |  | October 15, 2049
3.100% senior notes | 1,039.1 |  |  | 1,038.8 |  |  | June 15, 2050
2.950% senior notes | 1,024.3 |  |  | 1,023.8 |  |  | January 15, 2051
Total American Tower Corporation debt | 35,428.6 |  |  | 34,174.9 |  |  |
Series 2015-2 notes (8) | — |  |  | 524.7 |  |  | N/A
Series 2018-1A securities (9) | 498.1 |  |  | 497.6 |  |  | March 15, 2028
Series 2023-1A securities (10) | 1,290.8 |  |  | 1,288.0 |  |  | March 15, 2028
Other subsidiary debt (11) | 5.5 |  |  | — |  |  | Various
Total American Tower subsidiary debt | 1,794.4 |  |  | 2,310.3 |  |  |
Finance lease obligations | 15.9 |  |  | 16.6 |  |  |
Total | 37,238.9 |  |  | 36,501.8 |  |  |
Less current portion of long-term obligations | (2,387.7) |  |  | (3,693.0) |  |  |
Long-term obligations | $ | 34,851.2 |  |  | $ | 32,808.8 |  |  |
_______________ (1)Accrues interest at a variable rate. (2)Repaid in full on January 14, 2025 using cash on hand and borrowings under the 2021 Multicurrency Credit Facility (as defined below). (3)Repaid in full on March 14, 2025 using proceeds from the issuance of the 4.900% Notes and 5.350% Notes (each as defined below). (4)Repaid in full on April 3, 2025 using borrowings under the 2021 Multicurrency Credit Facility and cash on hand. (5)Notes are denominated in Euro (“EUR”). (6)Repaid in full on May 30, 2025 using borrowings under the 2021 Credit Facility (as defined below) and cash on hand. (7)Repaid in full on September 12, 2025 using borrowings under the 2021 Credit Facility. (8)Repaid in full on June 16, 2025 using borrowings under the 2021 Multicurrency Credit Facility and cash on hand. (9)Maturity date reflects the anticipated repayment date; final legal maturity is March 15, 2048. (10)Maturity date reflects the anticipated repayment date; final legal maturity is March 15, 2053. (11)As of September 30, 2025, includes the Bangladesh Term Loan and the CoreSite DE1 Note (as defined below). The key terms of the Notes are as follows:
Senior Notes |  | Aggregate Principal Amount (in millions) |  | Issue Date and Interest Accrual Date |  | Maturity Date |  | Contractual Interest Rate |  | First Interest Payment |  | Interest Payments Due (1) |  | Par Call Date (2)
4.900% Notes | (3) |  | $ | 850.0 |  |  | March 14, 2025 |  | March 15, 2030 |  | 4.900% |  | September 15, 2025 |  | March 15 and September 15 |  | February 15, 2030
5.350% Notes | (3) |  | $ | 725.0 |  |  | March 14, 2025 |  | March 15, 2035 |  | 5.350% |  | September 15, 2025 |  | March 15 and September 15 |  | December 15, 2034
3.625% Notes | (4) |  | $ | 567.4 |  |  | May 30, 2025 |  | May 30, 2032 |  | 3.625% |  | May 30, 2026 |  | May 30 |  | March 30, 2032
___________ (1)Accrued and unpaid interest on U.S. Dollar (“USD”) denominated notes is payable in USD semi-annually in arrears and will be computed from the issue date on the basis of a 360-day year comprised of twelve 30-day months. Interest on EUR denominated notes is payable in EUR annually in arrears and will be computed on the basis of the actual number of days in the period for which interest is being calculated and the actual number of days from and including the last date on which interest was paid on the notes, beginning on the issue date. (2)The Company may redeem the Notes at any time, in whole or in part, at a redemption price equal to 100% of the principal amount of the Notes plus a make-whole premium, together with accrued interest to the redemption date. If the Company redeems the Notes on or after the par call date, the Company will not be required to pay a make-whole premium. (3)The Initial 4.900% Notes and the Initial 5.350% Notes were issued on March 14, 2025. The Reopened 4.900% Notes and the Reopened 5.350% Notes were issued on September 16, 2025. The first interest payments made on September 15, 2025 related solely to the Initial 4.900% Notes and the Initial 5.350% Notes. The first interest payments on the Reopened 4.900% Notes and the Reopened 5.350% Notes are due on March 15, 2026. (4)The 3.625% Notes are denominated in EUR; dollar amounts represent the equivalent issuance date aggregate principal amount. As of September 30, 2025, the key terms under the 2021 Multicurrency Credit Facility, the 2021 Credit Facility and the 2021 Term Loan were as follows:
| Outstanding Principal Balance (in millions) |  | Undrawn letters of credit (in millions) |  | Maturity Date |  | Current margin over SOFR or EURIBOR (1) |  | Current commitment fee (2)
2021 Multicurrency Credit Facility | $ | 445.0 |  |  | $ | 6.3 |  |  | January 28, 2028 | (3) | 0.875 | % |  | 0.100 | %
2021 Credit Facility | 815.0 |  |  | 29.8 |  |  | January 28, 2030 | (3) | 0.875 | % |  | 0.100 | %
2021 Term Loan | 1,000.0 |  |  | N/A |  | January 28, 2028 |  | 0.875 | % |  | N/A
_______________ (1)Secured Overnight Financing Rate (“SOFR”) applies to the USD denominated borrowings under the 2021 Multicurrency Credit Facility, the 2021 Credit Facility and the 2021 Term Loan. Euro Interbank Offer Rate (“EURIBOR”) applies for EURIBOR based borrowings. (2)Fee on undrawn portion of each credit facility. (3)Subject to two optional renewal periods.

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