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LONG-TERM OBLIGATIONS (Tables)
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments Outstanding amounts under the Company’s long-term obligations, reflecting discounts, premiums, debt issuance costs and fair value adjustments due to interest rate swaps consisted of the following:
As of
December 31, 2022December 31, 2021Contractual Interest Rate (1)Maturity Date (1)
2021 Multicurrency Credit Facility (2) (3)3,788.7 4,388.4 4.683 %June 30, 2025
2021 Term Loan (2) 996.3 995.4 5.460 %January 31, 2027
2021 Credit Facility (2)1,080.0 1,410.0 5.456 %January 31, 2027
2021 EUR Three Year Delayed Draw Term Loan (2) (3)882.9 937.6 2.730 %May 28, 2024
2021 USD 364-Day Delayed Draw Term Loan (4) — 2,998.5 N/AN/A
2021 USD Two Year Delayed Draw Term Loan (2) 1,499.3 1,498.4 5.563 %December 28, 2023
2.250% senior notes (5)
— 600.3 N/AN/A
3.50% senior notes (6)
999.8 997.9 3.500 %January 31, 2023
3.000% senior notes
694.5 709.9 3.000 %June 15, 2023
0.600% senior notes
498.9 497.9 0.600 %January 15, 2024
5.00% senior notes
1,000.5 1,000.9 5.000 %February 15, 2024
3.375% senior notes
648.3 647.0 3.375 %May 15, 2024
2.950% senior notes
646.4 644.7 2.950 %January 15, 2025
2.400% senior notes
747.3 746.1 2.400 %March 15, 2025
1.375% senior notes (7)
532.1 563.8 1.375 %April 4, 2025
4.000% senior notes
746.8 745.5 4.000 %June 1, 2025
1.300% senior notes
497.3 496.4 1.300 %September 15, 2025
4.400% senior notes
498.1 497.6 4.400 %February 15, 2026
1.600% senior notes
696.3 695.2 1.600 %April 15, 2026
1.950% senior notes (7)
532.1 564.3 1.950 %May 22, 2026
1.450% senior notes
594.5 593.0 1.450 %September 15, 2026
3.375% senior notes
992.9 991.2 3.375 %October 15, 2026
3.125% senior notes
398.6 398.3 3.125 %January 15, 2027
2.750% senior notes
746.1 745.2 2.750 %January 15, 2027
0.450% senior notes (7)
798.2 847.1 0.450 %January 15, 2027
0.400% senior notes (7)
530.4 562.5 0.400 %February 15, 2027
3.650% senior notes
643.3 — 3.650 %March 15, 2027
3.55% senior notes
746.3 745.5 3.550 %July 15, 2027
3.600% senior notes
695.1 694.3 3.600 %January 15, 2028
0.500% senior notes (7)
796.6 845.3 0.500 %January 15, 2028
1.500% senior notes
646.5 645.8 1.500 %January 31, 2028
3.950% senior notes
592.6 591.6 3.950 %March 15, 2029
0.875% senior notes (7)
797.8 847.3 0.875 %May 21, 2029
3.800% senior notes
1,636.8 1,635.1 3.800 %August 15, 2029
2.900% senior notes
743.4 742.5 2.900 %January 15, 2030
2.100% senior notes
742.2 741.2 2.100 %June 15, 2030
0.950% senior notes (7)
528.5 561.0 0.950 %October 5, 2030
1.875% senior notes
792.5 791.4 1.875 %October 15, 2030
2.700% senior notes
694.4 693.7 2.700 %April 15, 2031
2.300% senior notes
691.9 691.0 2.300 %September 15, 2031
1.000% senior notes (7)
689.1 731.7 1.000 %January 15, 2032
4.050% senior notes
642.2 — 4.050 %March 15, 2032
1.250% senior notes (7)
528.5 561.2 1.250 %May 21, 2033
3.700% senior notes
592.2 592.1 3.700 %October 15, 2049
3.100% senior notes
1,038.3 1,038.0 3.100 %June 15, 2050
2.950% senior notes
1,022.5 1,021.5 2.950 %January 15, 2051
Total American Tower Corporation debt36,307.0 39,943.3 
Series 2013-2A Securities (8)1,299.7 1,298.2 3.070 %March 15, 2023
Series 2018-1A Securities (8)496.1 495.3 3.652 %March 15, 2028
Series 2015-2 Notes (9)523.4 522.7 3.482 %June 16, 2025
CoreSite Debt (10)— 955.1 N/AN/A
Other subsidiary debt (11)16.2 8.0 VariousVarious
Total American Tower subsidiary debt2,335.4 3,279.3 
Finance lease obligations27.8 31.6 
Total38,670.2 43,254.2 
Less current portion of long-term obligations(4,514.2)(4,568.7)
Long-term obligations$34,156.0 $38,685.5 
_______________
(1)Reflects interest rate or maturity date as of December 31, 2022; interest rate does not reflect the impact of the interest rate swap agreements.
(2)Accrues interest at a variable rate.
(3)Reflects borrowings denominated in EUR and, for the 2021 Multicurrency Credit Facility (as defined below), reflects borrowings denominated in both EUR and U.S. Dollars (“USD”).
(4)Repaid in full during the year ended December 31, 2022 using proceeds from (i) the issuance of the 3.650% Notes and the 4.050% Notes (each as defined below), (ii) the June 2022 common stock offering (as further discussed in note 14), (iii) the Stonepeak Transaction (as defined and further discussed in note 15) and (iv) cash on hand.
(5)Repaid in full on January 14, 2022 using borrowings under the 2021 Credit Facility (as defined below).
(6)Repaid in full on January 31, 2023 using borrowings under the 2021 Credit Facility.
(7)Notes are denominated in EUR.
(8)Maturity date reflects the anticipated repayment date; final legal maturity is March 15, 2048.
(9)Maturity date reflects the anticipated repayment date; final legal maturity is June 15, 2050.
(10)Debt entered into by CoreSite assumed in connection with the CoreSite Acquisition (the “CoreSite Debt”). On January 7, 2022, all amounts outstanding under the CoreSite Debt were repaid using borrowings under the 2021 Multicurrency Credit Facility and cash on hand.
(11)Includes the Nigeria Letters of Credit (as defined below). As of December 31, 2021, also included the Kenya Debt and the U.S. Subsidiary Debt (each as defined below).
As of December 31, 2022, the key terms under the 2021 Multicurrency Credit Facility, the 2021 Credit Facility, the Company’s $1.0 billion unsecured term loan, as amended and restated in December 2021 (the “2021 Term Loan”), the Company’s 825.0 million EUR unsecured term loan, as amended in December 2021 (the “2021 EUR Three Year Delayed Draw Term Loan”) and the Company’s $1.5 billion unsecured term loan entered into in December 2021 (the “2021 USD Two Year Delayed Draw Term Loan”) were as follows:
Outstanding Principal BalanceUndrawn letters of creditMaturity DateCurrent margin over LIBOR or EURIBOR (1)Current commitment fee (2)
2021 Multicurrency Credit Facility$3,788.7 $3.5 June 30, 2025(3)1.125 %0.110 %
2021 Credit Facility1,080.0 30.9 January 31, 2027(3)1.125 %0.110 %
2021 Term Loan1,000.0 N/AJanuary 31, 20271.125 %N/A
2021 EUR Three Year Delayed Draw Term Loan883.2 N/AMay 28, 20241.125 %N/A
2021 USD Two Year Delayed Draw Term Loan1,500.0 N/ADecember 28, 20231.125 %N/A
_______________
(1)    London Interbank Offered Rate (“LIBOR”) applies to the USD denominated borrowings under the 2021 Multicurrency Credit Facility, the 2021 Credit Facility, the 2021 Term Loan and the 2021 USD Two Year Delayed Draw Term Loan. Euro Interbank Offer Rate (“EURIBOR”) applies to the EUR denominated borrowings under the 2021 Multicurrency Credit Facility and all of the borrowings under the 2021 EUR Three Year Delayed Draw Term Loan.
(2)    Fee on undrawn portion of each credit facility.
(3)    Subject to two optional renewal periods.
The following table outlines key terms related to the Company’s outstanding senior notes as of December 31, 2022:
Adjustments to Principal Amount (1)
Aggregate Principal Amount20222021Interest
payments due (2)		Issue DatePar Call Date (3)
3.50% Notes
1,000.0 (0.2)(2.1)January 31 and July 31January 8, 2013N/A
3.000% Notes (4)
700.0 (5.5)9.9 June 15 and December 15December 8, 2017N/A
0.600% Notes
500.0 (1.1)(2.1)January 15 and July 15November 20, 2020N/A
5.00% Notes (5)
1,000.0 0.5 0.9 February 15 and August 15August 19, 2013N/A
3.375% Notes
650.0 (1.7)(3.0)May 15 and November 15March 15, 2019April 15, 2024
2.950% Notes
650.0 (3.6)(5.3)January 15 and July 15June 13, 2019December 15, 2024
2.400% Notes
750.0 (2.7)(3.9)March 15 and September 15January 10, 2020February 15, 2025
1.375% Notes (6)
535.3 (3.2)(4.8)April 4April 6, 2017January 4, 2025
4.000% Notes
750.0 (3.2)(4.5)June 1 and December 1May 7, 2015March 1, 2025
1.300% Notes
500.0 (2.7)(3.6)March 15 and September 15June 3, 2020August 15, 2025
4.400% Notes
500.0 (1.9)(2.4)February 15 and August 15January 12, 2016November 15, 2025
1.600% Notes
700.0 (3.7)(4.8)April 15 and October 15March 29, 2021March 15, 2026
1.950% Notes (6)
535.3 (3.2)(4.3)May 22May 22, 2018February 22, 2026
1.450% Notes
600.0 (5.5)(7.0)March 15 and September 15September 27, 2021August 15, 2026
3.375% Notes
1,000.0 (7.1)(8.8)April 15 and October 15May 13, 2016July 15, 2026
3.125% Notes
400.0 (1.4)(1.7)January 15 and July 15September 30, 2016October 15, 2026
2.750% Notes
750.0 (3.9)(4.8)January 15 and July 15October 3, 2019November 15, 2026
0.450% Notes (6)
802.9 (4.7)(5.9)January 15May 21, 2021November 15, 2026
0.400% Notes (6)
535.3 (4.9)(6.1)February 15October 5, 2021December 15, 2026
3.650% Notes
650.0 (6.7)— March 15 and September 15April 1, 2022February 15, 2027
3.55% Notes
750.0 (3.7)(4.5)January 15 and July 15June 30, 2017April 15, 2027
3.600% Notes
700.0 (4.9)(5.7)January 15 and July 15December 8, 2017October 15, 2027
0.500% Notes (6)
802.9 (6.3)(7.7)January 15September 10, 2020October 15, 2027
1.500% Notes
650.0 (3.5)(4.2)January 31 and July 31November 20, 2020November 30, 2027
3.950% Notes
600.0 (7.4)(8.4)March 15 and September 15March 15, 2019December 15, 2028
0.875% Notes (6)
802.9 (5.1)(5.7)May 21May 21, 2021February 21, 2029
3.800% Notes
1,650.0 (13.2)(14.9)February 15 and August 15June 13, 2019May 15, 2029
2.900% Notes
750.0 (6.6)(7.5)January 15 and July 15January 10, 2020October 15, 2029
2.100% Notes
750.0 (7.8)(8.8)June 15 and December 15June 3, 2020March 15, 2030
0.950% Notes (6)
535.3 (6.8)(7.6)October 5October 5, 2021July 5, 2030
1.875% Notes
800.0 (7.5)(8.6)April 15 and October 15September 28, 2020July 15, 2030
2.700% Notes
700.0 (5.6)(6.3)April 15 and October 15March 29, 2021January 15, 2031
2.300% Notes
700.0 (8.1)(9.0)March 15 and September 15September 27, 2021June 15, 2031
1.000% Notes (6)
695.9 (6.8)(7.5)January 15September 10, 2020October 15, 2031
4.050% Notes
650.0 (7.8)— March 15 and September 15April 1, 2022December 15, 2031
1.250% Notes (6)
535.3 (6.8)(7.4)May 21May 21, 2021February 21, 2033
3.700% Notes
600.0 (7.8)(7.9)April 15 and October 15October 3, 2019April 15, 2049
3.100% Notes (7)
1,050.0 (11.7)(12.0)June 15 and December 15June 3, 2020December 15, 2049
2.950% Notes (8)
1,050.0 (27.5)(28.5)January 15 and July 15November 20, 2020July 15, 2050
_______________
(1)    Includes unamortized discounts, premiums and debt issuance costs and fair value adjustments due to interest rate swaps.
(2)    Accrued and unpaid interest on 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.
(3)    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.
(4)    Includes $(4.9) million and $11.8 million fair value adjustment due to interest rate swaps in 2022 and 2021, respectively.
(5)    The original issue date for the initial 5.00% Notes was August 19, 2013. The issue date for the reopened 5.00% Notes was January 10, 2014.
(6)    Notes are denominated in EUR.
(7)    The original issue date for the initial 3.100% Notes was June 3, 2020. The issue date for the reopened 3.100% Notes was September 28, 2020.
(8)    The original issue date for the initial 2.950% Notes was November 20, 2020. The issue date for the reopened 2.950% Notes was September 27, 2021.
Amounts outstanding and key terms of the India indebtedness consisted of the following as of December 31, 2022 (in millions, except percentages):
Amount Outstanding (INR)Amount Outstanding (USD)Interest Rate (Range)Maturity Date (Range)
Working capital facilities (1)
— $— 
8.03% - 8.80%
February 4, 2023 - October 22, 2023
_______________
(1)    7.9 billion Indian Rupees (“INR”) ($95.6 million) of borrowing capacity as of December 31, 2022. The Company has 0.2 billion INR (approximately $2.6 million) of bank guarantees outstanding included within the overall borrowing capacity.
Amounts outstanding and key terms of other subsidiary debt consisted of the following as of December 31, (in millions, except percentages):
Carrying Value
 (USD)		Interest RateMaturity Date
20222021
Nigeria Letters of Credit (1)$16.2 $— VariousVarious
Kenya Debt (2)$— $7.4 N/AN/A
U.S. Subsidiary Debt (3)$— $0.6 N/AN/A
_______________
(1)    Denominated in USD. During the year ended December 31, 2022, we drew on letters of credit in Nigeria. The drawn amounts bear interest at a rate equal to the Secured Overnight Financing Rate at the time of drawing plus a spread. Amounts are due 270 days from the date of drawing.
(2)    Denominated in USD, with an original principal amount of $51.8 million. The loan agreement for the Kenya Debt required that the debt be paid either (i) in future installments subject to the satisfaction of specified conditions or (ii) five years from the note origination date, including the exercise of an optional two year extension, subject to the satisfaction of specified conditions. As of December 31, 2022, there are no amounts outstanding under the Kenya Debt.
(3)    Related to a seller-financed acquisition. Denominated in USD with an original principal amount of $2.5 million. Repaid in full during the year ended December 31, 2022.
Schedule of Maturities of Long-term Debt Aggregate principal maturities of long-term debt, including finance leases, for the next five years and thereafter are expected to be:
Fiscal YearAmount
2023$4,514.2 
20243,038.6 
20257,501.3 
20263,336.6 
20275,969.2 
Thereafter14,541.9 
Total cash obligations38,901.8 
Unamortized discounts, premiums and debt issuance costs and fair value adjustments, net(231.6)
Balance as of December 31, 2022$38,670.2