10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One):

☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended March 31, 2021.

☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.

Commission File Number: 001-14195

AMERICAN TOWER CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	65-0723837
(State or other jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)

116 Huntington Avenue

Boston, Massachusetts 02116

(Address of principal executive offices)

Telephone Number (617) 375-7500

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each Class	Trading Symbol(s)	Name of exchange on which registered
Common Stock, $0.01 par value	AMT	New York Stock Exchange
1.375% Senior Notes due 2025	AMT 25A	New York Stock Exchange
1.950% Senior Notes due 2026	AMT 26B	New York Stock Exchange
0.500% Senior Notes due 2028	AMT 28A	New York Stock Exchange
1.000% Senior Notes due 2032	AMT 32	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days:    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.   ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act):    Yes  ☐    No  ☒

As of April 22, 2021, there were 444,797,395 shares of common stock outstanding.

AMERICAN TOWER CORPORATION

TABLE OF CONTENTS

QUARTERLY REPORT ON FORM 10-Q

FOR THE QUARTER ENDED MARCH 31, 2021

		Page Nos.
PART I. FINANCIAL INFORMATION
Item 1.	Unaudited Consolidated and Condensed Consolidated Financial Statements		1
	Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020		1
	Consolidated Statements of Operations for the three months ended March 31, 2021 and 2020		2
	Consolidated Statements of Comprehensive Income (Loss) for the three months ended March 31, 2021 and 2020		3
	Consolidated Statements of Cash Flows for the three months ended March 31, 2021 and 2020		4
	Consolidated Statements of Equity for the three months ended March 31, 2021 and 2020		5
	Notes to Consolidated and Condensed Consolidated Financial Statements		6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		28
Item 3.	Quantitative and Qualitative Disclosures about Market Risk		49
Item 4.	Controls and Procedures		49
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings		51
Item 1A.	Risk Factors		51
Item 6.	Exhibits		52
Signatures			55

PART I. FINANCIAL INFORMATION

ITEM 1. UNAUDITED CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(in millions, except share count and per share data)

	March 31, 2021		December 31, 2020
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	1,913.6	$	1,746.3
Restricted cash	79.7		115.1
Accounts receivable, net	537.7		511.6
Prepaid and other current assets	490.6		532.6
Total current assets	3,021.6		2,905.6
PROPERTY AND EQUIPMENT, net	12,712.5		12,808.7
GOODWILL	7,262.4		7,282.7
OTHER INTANGIBLE ASSETS, net	13,507.3		13,839.8
DEFERRED TAX ASSET	127.3		123.1
DEFERRED RENT ASSET	2,197.4		2,084.3
RIGHT-OF-USE ASSET	7,719.9		7,789.2
NOTES RECEIVABLE AND OTHER NON-CURRENT ASSETS	394.1		400.1
TOTAL	$	46,942.5	$	47,233.5
LIABILITIES
CURRENT LIABILITIES:
Accounts payable	$	130.1	$	139.1
Accrued expenses	944.8		1,043.7
Distributions payable	555.8		544.6
Accrued interest	167.1		207.8
Current portion of operating lease liability	555.8		539.9
Current portion of long-term obligations	1,336.5		789.8
Unearned revenue	506.5		390.6
Total current liabilities	4,196.6		3,655.5
LONG-TERM OBLIGATIONS	27,990.3		28,497.7
OPERATING LEASE LIABILITY	6,812.9		6,884.4
ASSET RETIREMENT OBLIGATIONS	1,574.6		1,571.3
DEFERRED TAX LIABILITY	854.7		859.5
OTHER NON-CURRENT LIABILITIES	961.6		984.6
Total liabilities	42,390.7		42,453.0
COMMITMENTS AND CONTINGENCIES
REDEEMABLE NONCONTROLLING INTERESTS	212.9		212.1
EQUITY (shares in thousands):
Common stock: $.01 par value; 1,000,000 shares authorized; 455,708 and 455,245 shares issued; and 444,793 and 444,330 shares outstanding, respectively	4.6		4.6
Additional paid-in capital	10,474.6		10,473.7
Distributions in excess of earnings	(1,251.8)		(1,343.0)
Accumulated other comprehensive loss	(4,061.6)		(3,759.4)
Treasury stock (10,915 shares at cost)	(1,282.4)		(1,282.4)
Total American Tower Corporation equity	3,883.4		4,093.5
Noncontrolling interests	455.5		474.9
Total equity	4,338.9		4,568.4
TOTAL	$	46,942.5	$	47,233.5

See accompanying notes to unaudited consolidated and condensed consolidated financial statements.

1

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

(in millions, except share and per share data)

	Three Months Ended March 31,
	2021		2020
REVENUES:
Property	$	2,129.7	$	1,973.2
Services	28.8		19.9
Total operating revenues	2,158.5		1,993.1
OPERATING EXPENSES:
Costs of operations (exclusive of items shown separately below):
Property	563.3		544.1
Services	11.0		7.9
Depreciation, amortization and accretion	522.5		472.3
Selling, general, administrative and development expense	182.6		217.8
Other operating expenses	50.4		14.2
Total operating expenses	1,329.8		1,256.3
OPERATING INCOME	828.7		736.8
OTHER INCOME (EXPENSE):
Interest income	11.4		10.1
Interest expense	(207.0)		(208.8)
Loss on retirement of long-term obligations	(25.7)		(34.6)
Other income (expense) (including foreign currency gains (losses) of $94.7 and $(65.5), respectively)	95.2		(63.8)
Total other expense	(126.1)		(297.1)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	702.6		439.7
Income tax provision	(50.3)		(21.1)
NET INCOME	652.3		418.6
Net income attributable to noncontrolling interests	(7.3)		(3.6)
NET INCOME ATTRIBUTABLE TO AMERICAN TOWER CORPORATION COMMON STOCKHOLDERS	$	645.0	$	415.0
NET INCOME PER COMMON SHARE AMOUNTS:
Basic net income attributable to American Tower Corporation common stockholders	$	1.45	$	0.94
Diluted net income attributable to American Tower Corporation common stockholders	$	1.45	$	0.93
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING (in thousands):
BASIC	444,486		443,055
DILUTED	446,294		445,832

See accompanying notes to unaudited consolidated and condensed consolidated financial statements.

2

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(in millions)

	Three Months Ended March 31,
	2021		2020
Net income	$	652.3	$	418.6
Other comprehensive income (loss):
Changes in fair value of cash flow hedges, each net of tax expense of $0	(0.0)		(0.0)
Reclassification of unrealized losses on cash flow hedges to net income, each net of tax expense of $0	0.0		0.0
Foreign currency translation adjustments, each net of tax benefit of $(0.0)	(323.7)		(1,343.5)
Other comprehensive loss	(323.7)		(1,343.5)
Comprehensive income (loss)	328.6		(924.9)
Allocation of accumulated other comprehensive income (loss) resulting from purchases of redeemable noncontrolling interests	0.1		(142.2)
Comprehensive loss attributable to noncontrolling interests	14.1		34.0
Comprehensive income (loss) attributable to American Tower Corporation stockholders	$	342.8	$	(1,033.1)

See accompanying notes to unaudited consolidated and condensed consolidated financial statements.

3

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in millions)

	Three Months Ended March 31,
	2021		2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	652.3	$	418.6
Adjustments to reconcile net income to cash provided by operating activities
Depreciation, amortization and accretion	522.5		472.3
Stock-based compensation expense	38.0		47.7
Loss on early retirement of long-term obligations	25.7		34.6
Other non-cash items reflected in statements of operations	(87.5)		81.6
Increase in net deferred rent balances	(119.9)		(56.2)
Right-of-use asset and Operating lease liability, net	4.1		1.0
Decrease (increase) in assets	18.1		(210.8)
Increase in liabilities	39.4		11.2
Cash provided by operating activities	1,092.7		800.0
CASH FLOWS FROM INVESTING ACTIVITIES
Payments for purchase of property and equipment and construction activities	(324.8)		(214.4)
Payments for acquisitions, net of cash acquired	(114.8)		(49.3)
Proceeds from sale of short-term investments and other non-current assets	4.4		5.8
Deposits and other	(3.5)		4.5
Cash used for investing activities	(438.7)		(253.4)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings under credit facilities	1,870.0		2,642.3
Proceeds from issuance of senior notes, net	1,398.1		1,496.0
Proceeds from term loan	—		750.0
Repayments of notes payable, credit facilities, senior notes, secured debt, term loan and finance leases	(3,071.3)		(4,351.2)
Distributions to noncontrolling interest holders, net	(8.1)		(13.5)
Purchases of common stock	—		(39.7)
Proceeds from stock options	1.9		11.1
Distributions paid on common stock	(544.9)		(454.9)
Payment for early retirement of long-term obligations	(61.9)		(33.5)
Deferred financing costs and other financing activities	(61.3)		(88.2)
Purchase of redeemable noncontrolling interest	(2.5)		(524.4)
Cash used for financing activities	(480.0)		(606.0)
Net effect of changes in foreign currency exchange rates on cash and cash equivalents, and restricted cash	(42.1)		(118.3)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH	131.9		(177.7)
CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF PERIOD	1,861.4		1,578.0
CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD	$	1,993.3	$	1,400.3
CASH PAID FOR INCOME TAXES (NET OF REFUNDS OF $24.8 AND $0.1, RESPECTIVELY)	$	5.8	$	35.1
CASH PAID FOR INTEREST	$	239.1	$	262.0
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Purchases of property and equipment under finance leases and perpetual easements	$	10.5	$	13.1
Decrease in accounts payable and accrued expenses for purchases of property and equipment and construction activities	$	(34.4)	$	(15.0)
Settlement of third-party debt	$	—	$	(5.0)

See accompanying notes to unaudited consolidated and condensed consolidated financial statements.

4

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF EQUITY

(in millions, share counts in thousands)

	Common Stock			Treasury Stock			Additional Paid-in Capital		Accumulated Other Comprehensive Loss		Distributions in Excess of Earnings		Noncontrolling Interests		Total Equity
Three Months Ended March 31, 2020 and 2021	Issued Shares	Amount		Shares	Amount
BALANCE, JANUARY 1, 2020	453,541	$	4.5	(10,651)	$	(1,226.4)	$	10,117.7	$	(2,823.6)	$	(1,016.8)	$	435.0	$	5,490.4
Stock-based compensation related activity	655	0.0		—	—		(4.3)		—		—		—		(4.3)
Treasury stock activity	—	—		(213)	(45.1)		—		—		—		—		(45.1)
Changes in fair value of cash flow hedges, net of tax	—	—		—	—		—		(0.0)		—		—		(0.0)
Reclassification of unrealized losses on cash flow hedges to net income, net of tax	—	—		—	—		—		0.0		—		—		0.0
Foreign currency translation adjustment, net of tax	—	—		—	—		—		(1,305.9)		—		(5.5)		(1,311.4)
Distributions to noncontrolling interest	—	—		—	—		—		—		—		(1.5)		(1.5)
Purchase of redeemable noncontrolling interest	—	—		—	—		142.2		(142.2)		—		—		—
Common stock distributions declared	—	—		—	—		—		—		(480.7)		—		(480.7)
Net income	—	—		—	—		—		—		415.0		2.2		417.2
BALANCE, MARCH 31, 2020	454,196	$	4.5	(10,864)	$	(1,271.5)	$	10,255.6	$	(4,271.7)	$	(1,082.5)	$	430.2	$	4,064.6
BALANCE, JANUARY 1, 2021	455,245	$	4.6	(10,915)	$	(1,282.4)	$	10,473.7	$	(3,759.4)	$	(1,343.0)	$	474.9	$	4,568.4
Stock-based compensation related activity	437	0.0		—	—		(0.7)		—		—		—		(0.7)
Changes in fair value of cash flow hedges, net of tax	—	—		—	—		—		(0.0)		—		—		(0.0)
Reclassification of unrealized losses on cash flow hedges to net income, net of tax	—	—		—	—		—		0.0		—		—		0.0
Foreign currency translation adjustment, net of tax	—	—		—	—		—		(302.3)		—		(21.2)		(323.5)
Distributions to noncontrolling interest	—	—		—	—		—		—		—		(0.3)		(0.3)
Redemption of noncontrolling interest	26	0.0		—	—		1.7		—		—		(1.7)		—
Purchase of redeemable noncontrolling interest	—	—		—	—		(0.1)		0.1		—		—		—
Common stock distributions declared	—	—		—	—		—		—		(553.8)		—		(553.8)
Net income	—	—		—	—		—		—		645.0		3.8		648.8
BALANCE, MARCH 31, 2021	455,708	$	4.6	(10,915)	$	(1,282.4)	$	10,474.6	$	(4,061.6)	$	(1,251.8)	$	455.5	$	4,338.9

See accompanying notes to unaudited consolidated and condensed consolidated financial statements.

5

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

1.    BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

The accompanying consolidated and condensed consolidated financial statements have been prepared by American Tower Corporation (together with its subsidiaries, “ATC” or the “Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). The financial information included herein is unaudited. However, the Company believes that all adjustments, which are of a normal and recurring nature, considered necessary for a fair presentation of its financial position and results of operations for such periods have been included herein. The consolidated and condensed consolidated financial statements and related notes should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (the “2020 Form 10-K”). The results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results that may be expected for the entire year.

Principles of Consolidation and Basis of Presentation—The accompanying consolidated and condensed consolidated financial statements include the accounts of the Company and those entities in which it has a controlling interest. Investments in entities that the Company does not control are accounted for using the equity method or as investments in equity securities, depending upon the Company’s ability to exercise significant influence over operating and financial policies. All intercompany accounts and transactions have been eliminated. As of March 31, 2021, the Company holds (i) a 51% controlling interest in ATC Europe B.V. (“ATC Europe”), a joint venture that primarily consists of the Company’s operations in France, Germany and Poland (PGGM holds a 49% noncontrolling interest) and (ii) a 92% controlling interest in ATC Telecom Infrastructure Private Limited (“ATC TIPL”), formerly Viom Networks Limited (“Viom”), in India.

Reportable Segments— During the fourth quarter of 2020, as a result of the Company’s acquisition of InSite Wireless Group, LLC (“InSite,” and the acquisition, the “InSite Acquisition”), the Company updated its reportable segments to rename U.S. property and Asia property to U.S. & Canada property and Asia-Pacific property, respectively. The Company continues to report its results in six segments – U.S. & Canada property, Asia-Pacific property, Africa property, Europe property, Latin America property and services, which are discussed further in note 15. The change in reportable segment names is solely reflective of the inclusion of Canada and Australia in the Company’s business operations, as a result of the InSite Acquisition, and had no impact on the Company’s consolidated financial statements or historical segment financial information for any prior periods.

Significant Accounting Policies—The Company’s significant accounting policies are described in note 1 to the Company’s consolidated financial statements included in the 2020 Form 10-K. There have been no material changes to the Company’s significant accounting policies during the three months ended March 31, 2021.

Cash and Cash Equivalents and Restricted Cash—The reconciliation of cash and cash equivalents and restricted cash reported within the applicable balance sheet that sum to the total of the same such amounts shown in the statement of cash flows is as follows:

	Three Months Ended March 31,
	2021		2020
Cash and cash equivalents	$	1,913.6	$	1,326.0
Restricted cash	79.7		74.3
Total cash, cash equivalents and restricted cash	$	1,993.3	$	1,400.3

Revenue—The Company’s revenue is derived from leasing the right to use its communications sites and the land on which the sites are located (the “lease component”) and from the reimbursement of costs incurred by the Company in operating the communications sites and supporting the tenants’ equipment as well as other services and contractual rights (the “non-lease component”). Most of the Company’s revenue is derived from leasing arrangements and is accounted for as lease revenue unless the timing and pattern of revenue recognition of the non-lease component differs from the lease component. If the timing and pattern of the non-lease component revenue recognition differs from that of the lease component, the Company separately determines the stand-alone selling prices and pattern of revenue recognition for each performance obligation. Revenue related to distributed antenna system (“DAS”) networks and fiber and other related assets results from agreements with tenants that are not leases.

6

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

Non-lease revenue—Non-lease revenue consists primarily of revenue generated from DAS networks, fiber and other property related revenue. DAS networks and fiber arrangements require that the Company provide the tenant the right to use the applicable communications infrastructure. Performance obligations are satisfied over time for the duration of the arrangements. Other property related revenue streams, which include site inspections, are not material on either an individual or consolidated basis. There were no material changes in the receivables, contract assets and contract liabilities from contracts with tenants for the three months ended March 31, 2021.

Services revenue—The Company offers tower-related services in the United States. These services include site application, zoning and permitting (“AZP”) and structural analysis. There is a single performance obligation related to AZP and revenue is recognized over time based on milestones achieved, which are determined based on costs expected to be incurred. Structural analysis services may have more than one performance obligation, contingent upon the number of contracted services. Revenue is recognized at the point in time the services are completed.

A summary of revenue disaggregated by source and geography is as follows:

Three Months Ended March 31, 2021	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America		Total
Non-lease property revenue	$	71.6	$	2.5	$	4.9	$	2.2	$	31.9	$	113.1
Services revenue	28.8		—		—		—		—		28.8
Total non-lease revenue	$	100.4	$	2.5	$	4.9	$	2.2	$	31.9	$	141.9
Property lease revenue	1,159.7		278.9		230.8		42.4		304.8		2,016.6
Total revenue	$	1,260.1	$	281.4	$	235.7	$	44.6	$	336.7	$	2,158.5

Three Months Ended March 31, 2020	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America		Total
Non-lease property revenue	$	58.6	$	2.2	$	2.9	$	1.5	$	32.9	$	98.1
Services revenue	19.9		—		—		—		—		19.9
Total non-lease revenue	$	78.5	$	2.2	$	2.9	$	1.5	$	32.9	$	118.0
Property lease revenue	1,031.3		284.4		222.6		33.0		303.8		1,875.1
Total revenue	$	1,109.8	$	286.6	$	225.5	$	34.5	$	336.7	$	1,993.1

Accounting Standards Updates

In March 2020, the Financial Accounting Standards Board (the “FASB”) issued guidance to provide optional expedients and exceptions for applying accounting principles generally accepted in the United States to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The guidance applies only to contracts, hedging relationships and other transactions that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by the guidance do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022 for which an entity has elected certain optional expedients that are retained through the end of the hedging relationship. In January 2021, the FASB issued additional guidance that clarifies that certain practical expedients and exceptions for contract modifications and hedge accounting apply to derivatives that are affected by reference rate reform. As of March 31, 2021, the Company has not modified any contracts as a result of reference rate reform and is evaluating the impact this standard may have on its financial statements.

7

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

2.    PREPAID AND OTHER CURRENT ASSETS

Prepaid and other current assets consisted of the following:

	As of
	March 31, 2021		December 31, 2020
Prepaid assets	$	76.2	$	66.1
Prepaid income tax	100.3		143.7
Unbilled receivables	160.8		176.9
Value added tax and other consumption tax receivables	58.1		66.3
Other miscellaneous current assets	95.2		79.6
Prepaid and other current assets	$	490.6	$	532.6

3.    LEASES

The Company determines if an arrangement is a lease at the inception of the agreement. The Company considers an arrangement to be a lease if it conveys the right to control the use of the communications site or ground space underneath a communications site for a period of time in exchange for consideration. The Company is both a lessor and a lessee.

During the three months ended March 31, 2021, the Company made no changes to the methods described in note 4 to its consolidated financial statements included in the 2020 Form 10-K. As of March 31, 2021, the Company does not have any material related party leases as either a lessor or a lessee. To the extent there are any intercompany leases, these are eliminated in consolidation.

Lessor— Historically, the Company has been able to successfully renew its ground leases as needed to ensure continuation of its tower revenue. Accordingly, the Company assumes that it will have access to the land underneath its tower sites when calculating future minimum rental receipts. Future minimum rental receipts expected under non-cancellable operating lease agreements as of March 31, 2021 were as follows:

Fiscal Year	Amount (1)
Remainder of 2021	$	4,632.2
2022	5,976.8
2023	5,866.5
2024	5,755.9
2025	5,330.3
Thereafter	32,576.0
Total	$	60,137.7

_______________

(1)Balances are translated at the applicable period-end exchange rate, which may impact comparability between periods.    

Lessee—The Company assesses its right-of-use asset and other lease-related assets for impairment, as described in note 1 to the Company’s consolidated financial statements included in the 2020 Form 10-K. There were no material impairments recorded related to these assets during the three months ended March 31, 2021 and 2020.

The Company leases certain land and office space under operating leases and land and improvements, towers and vehicles under finance leases. As of March 31, 2021, operating lease assets were included in Right-of-use asset and finance lease assets were included in Property and equipment, net in the consolidated balance sheet. During the three months ended March 31, 2021, there were no material changes in the terms and provisions of the Company’s operating leases in which the Company is a lessee. There were no material changes in finance lease assets and liabilities during the three months ended March 31, 2021.

8

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

Information about other lease-related balances is as follows:

	As of
	March 31, 2021		December 31, 2020
Operating leases:
Right-of-use asset	$	7,719.9	$	7,789.2
Current portion of lease liability	$	555.8	$	539.9
Lease liability	6,812.9		6,884.4
Total operating lease liability	$	7,368.7	$	7,424.3

The weighted-average remaining lease terms and incremental borrowing rates are as follows:

	As of
	March 31, 2021		December 31, 2020
Operating leases:
Weighted-average remaining lease term (years)	13.6		13.7
Weighted-average incremental borrowing rate	5.6	%	5.6	%

The following table sets forth the components of lease cost:

	Three Months Ended March 31,
	2021		2020
Operating lease cost	$	251.3	$	250.7
Variable lease costs not included in lease liability (1)	69.3		61.4

_______________

(1)Includes property tax paid on behalf of the landlord.

Supplemental cash flow information is as follows:

	Three Months Ended March 31,
	2021		2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	(244.9)	$	(252.0)
Non-cash items:
New operating leases (1)	$	89.2	$	50.1
Operating lease modifications and reassessments	$	85.7	$	96.9

_______________

(1)Amount includes new operating leases and leases acquired in connection with acquisitions.

As of March 31, 2021, the Company does not have material operating or financing leases that have not yet commenced.

9

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

Maturities of operating lease liabilities as of March 31, 2021 were as follows:

Fiscal Year	Operating Lease (1)
Remainder of 2021	$	678.3
2022	874.6
2023	842.7
2024	805.2
2025	759.8
Thereafter	6,497.9
Total lease payments	10,458.5
Less amounts representing interest	(3,089.8)
Total lease liability	7,368.7
Less current portion of lease liability	555.8
Non-current lease liability	$	6,812.9

_______________

(1)Balances are translated at the applicable period-end exchange rate, which may impact comparability between periods.

4.    GOODWILL AND OTHER INTANGIBLE ASSETS

The changes in the carrying value of goodwill for each of the Company’s business segments were as follows:

	Property										Services		Total
	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America
Balance as of January 1, 2021	$	4,750.8	$	1,016.9	$	625.6	$	279.1	$	608.3	$	2.0	$	7,282.7
Additions and adjustments (1)	21.3		(0.0)		—		—		—		—		21.3
Effect of foreign currency translation	4.2		(0.5)		(3.4)		(11.1)		(30.8)		—		(41.6)
Balance as of March 31, 2021	$	4,776.3	$	1,016.4	$	622.2	$	268.0	$	577.5	$	2.0	$	7,262.4

_______________

(1)Consists of an aggregate of $21.3 million of measurement period adjustments related to the InSite Acquisition.

The Company’s other intangible assets subject to amortization consisted of the following:

		As of March 31, 2021						As of December 31, 2020
	Estimated Useful Lives (years)	Gross Carrying Value		Accumulated Amortization		Net Book Value		Gross Carrying Value		Accumulated Amortization		Net Book Value
Acquired network location intangibles (1)	Up to 20	$	5,751.7	$	(2,171.1)	$	3,580.6	$	5,784.0	$	(2,117.6)	$	3,666.4
Acquired tenant-related intangibles	Up to 20	14,221.7		(4,379.6)		9,842.1		14,322.5		(4,237.5)		10,085.0
Acquired licenses and other intangibles	3-20	94.6		(10.0)		84.6		97.8		(9.4)		88.4
Total other intangible assets		$	20,068.0	$	(6,560.7)	$	13,507.3	$	20,204.3	$	(6,364.5)	$	13,839.8

_______________

(1)Acquired network location intangibles are amortized over the shorter of the term of the corresponding ground lease, taking into consideration lease renewal options and residual value, generally up to 20 years, as the Company considers these intangibles to be directly related to the tower assets.

The acquired network location intangibles represent the value to the Company of the incremental revenue growth that could potentially be obtained from leasing the excess capacity on acquired communications sites. The acquired tenant-

10

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

related intangibles typically represent the value to the Company of tenant contracts and relationships in place at the time of an acquisition or similar transaction, including assumptions regarding estimated renewals.

The Company amortizes its acquired network location intangibles and tenant-related intangibles on a straight-line basis over their estimated useful lives. As of March 31, 2021, the remaining weighted average amortization period of the Company’s intangible assets was 15 years. Amortization of intangible assets for the three months ended March 31, 2021 and 2020 was $253.4 million and $217.5 million, respectively. Based on current exchange rates, the Company expects to record amortization expense as follows over the remaining current year and the five subsequent years:

Fiscal Year	Amount
Remainder of 2021	$	735.9
2022	975.8
2023	954.5
2024	944.9
2025	914.5
2026	873.2

5.    ACCRUED EXPENSES

Accrued expenses consisted of the following:

	As of
	March 31, 2021		December 31, 2020
Accrued construction costs	$	37.8	$	46.5
Accrued income tax payable	22.3		20.6
Accrued pass-through costs	78.3		67.1
Amounts payable for acquisitions	15.7		58.9
Amounts payable to tenants	63.5		66.4
Accrued property and real estate taxes	222.0		219.1
Accrued rent	81.0		82.6
Payroll and related withholdings	67.1		104.4
Other accrued expenses	357.1		378.1
Total accrued expenses	$	944.8	$	1,043.7

6.    LONG-TERM OBLIGATIONS
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:

11

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

	As of
	March 31, 2021		December 31, 2020		Maturity Date
2020 Term Loan (1) (2)	$	—	$	749.4	N/A
2021 Multicurrency Credit Facility (1)	270.0		—		June 28, 2024
2019 Term Loan (1)	995.8		996.1		January 31, 2025
2021 Credit Facility (1)	2,345.0		2,295.0		January 31, 2026
2.250% senior notes	604.0		605.1		January 15, 2022
4.70% senior notes	699.2		699.0		March 15, 2022
3.50% senior notes	996.5		996.1		January 31, 2023
3.000% senior notes	718.7		721.9		June 15, 2023
0.600% senior notes	497.1		496.8		January 15, 2024
5.00% senior notes	1,001.2		1,001.3		February 15, 2024
3.375% senior notes	646.0		645.7		May 15, 2024
2.950% senior notes	643.4		643.1		January 15, 2025
2.400% senior notes	745.3		745.0		March 15, 2025
1.375% senior notes (3)	580.2		604.1		April 4, 2025
4.000% senior notes	744.8		744.3		June 1, 2025
1.300% senior notes	495.6		495.4		September 15, 2025
4.400% senior notes	497.2		497.1		February 15, 2026
1.600% senior notes	694.4		—		April 15, 2026
1.950% senior notes (3)	581.2		605.2		May 22, 2026
3.375% senior notes	989.9		989.5		October 15, 2026
3.125% senior notes	398.0		397.9		January 15, 2027
2.750% senior notes	744.5		744.3		January 15, 2027
3.55% senior notes	745.0		744.8		July 15, 2027
0.500% senior notes (3)	871.2		907.4		January 15, 2028
3.600% senior notes	693.6		693.4		January 15, 2028
1.500% senior notes	645.3		645.1		January 31, 2028
3.950% senior notes	590.8		590.6		March 15, 2029
3.800% senior notes	1,633.9		1,633.5		August 15, 2029
2.900% senior notes	741.9		741.7		January 15, 2030
2.100% senior notes	740.5		740.2		June 15, 2030
1.875% senior notes	790.8		790.5		October 15, 2030
2.700% senior notes	693.3		—		April 15, 2031
1.000% senior notes (3)	754.5		786.1		January 15, 2032
3.700% senior notes	591.9		591.9		October 15, 2049
3.100% senior notes	1,037.8		1,037.7		June 15, 2050
2.950% senior notes	538.3		538.2		January 15, 2051
Total American Tower Corporation debt	26,956.8		26,113.4
Series 2013-2A securities (4)	1,297.0		1,296.6		March 15, 2023
Series 2018-1A securities (4)	494.8		494.6		March 15, 2028
Series 2015-2 notes (5)	522.2		522.1		June 16, 2025
InSite Debt (6)	—		800.0		N/A
Other subsidiary debt (7)	26.1		32.9		Various
Total American Tower subsidiary debt	2,340.1		3,146.2
Finance lease obligations	29.9		27.9
Total	29,326.8		29,287.5
Less current portion of long-term obligations	(1,336.5)		(789.8)
Long-term obligations	$	27,990.3	$	28,497.7

_______________

(1)Accrues interest at a variable rate.

(2)Repaid in full on February 5, 2021 using borrowings from the 2021 Multicurrency Credit Facility (as defined below) and cash on hand.

(3)Notes are denominated in Euros (“EUR”).

(4)Maturity date reflects the anticipated repayment date; final legal maturity is March 15, 2048.

12

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

(5)Maturity date reflects the anticipated repayment date; final legal maturity is June 15, 2050.

(6)Debt entered into by certain InSite subsidiaries acquired in connection with the InSite Acquisition (the “InSite Debt”). On January 15, 2021, all amounts outstanding under the InSite Debt were repaid.

(7)Includes (a) the Colombian credit facility, which is denominated in Colombian Pesos (“COP”) and amortizes through April 24, 2021, (b) debt entered into by the Company’s Kenyan subsidiary in connection with an acquisition of sites in Kenya, which is denominated in U.S. Dollars (“USD”) and is payable either (i) in future installments subject to the satisfaction of specified conditions or (ii) three years from the note origination date, and (c) U.S. subsidiary debt related to a seller-financed acquisition.

Current portion of long-term obligations—The Company’s current portion of long-term obligations primarily includes (i) $600.0 million aggregate principal amount of 2.250% senior unsecured notes due January 15, 2022 and (ii) $700.0 million aggregate principal amount of 4.70% senior unsecured notes due March 15, 2022.

Securitized Debt—Cash flows generated by the sites that secure the securitized debt of the Company are only available for payment of such debt and are not available to pay the Company’s other obligations or the claims of its creditors. However, subject to certain restrictions, the Company holds the right to receive the excess cash flows not needed to service the securitized debt and other obligations arising out of the securitizations. The securitized debt is the obligation of the issuers thereof or borrowers thereunder, as applicable, and their subsidiaries, and not of the Company or its other subsidiaries.

Repayment of InSite Debt—The InSite Debt included securitizations entered into by certain InSite subsidiaries. The Company acquired this debt in connection with the InSite Acquisition. The InSite Debt was recorded at fair value upon acquisition. On January 15, 2021, the Company repaid the entire amount outstanding under the InSite Debt, plus accrued and unpaid interest up to, but excluding, January 15, 2021, for an aggregate redemption price of $826.4 million, including $2.3 million in accrued and unpaid interest. The Company recorded a loss on retirement of long-term obligations of approximately $25.7 million, which includes prepayment consideration partially offset by the unamortized fair value adjustment recorded upon acquisition. The repayment of the InSite Debt was funded with borrowings under the 2021 Multicurrency Credit Facility and the 2021 Credit Facility (as defined below) and cash on hand.

Offerings of Senior Notes

1.600% Senior Notes and 2.700% Senior Notes Offering—On March 29, 2021, the Company completed a registered public offering of $700.0 million aggregate principal amount of 1.600% senior unsecured notes due 2026 (the “1.600% Notes”) and $700.0 million aggregate principal amount of 2.700% senior unsecured notes due 2031 (the “2.700% Notes” and, together with the 1.600% Notes, the “Notes”). The net proceeds from this offering were approximately $1,386.3 million, after deducting commissions and estimated expenses. The Company used all of the net proceeds to repay existing indebtedness under the 2021 Multicurrency Credit Facility.

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)
1.600% Notes	$	700.0	March 29, 2021	April 15, 2026	1.600	%	October 15, 2021	April 15 and October 15	March 15, 2026
2.700% Notes	$	700.0	March 29, 2021	April 15, 2031	2.700	%	October 15, 2021	April 15 and October 15	January 15, 2031

___________

(1)Accrued and unpaid interest 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.

(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.

If the Company undergoes a change of control and corresponding ratings decline, each as defined in the supplemental indenture for the Notes, the Company may be required to repurchase all of the Notes at a purchase price equal to 101% of the principal amount of such Notes, plus accrued and unpaid interest (including additional interest, if any), up to but not including the repurchase date. The Notes rank equally with all of the Company’s other senior unsecured debt and are structurally subordinated to all existing and future indebtedness and other obligations of its subsidiaries.

The supplemental indenture contains certain covenants that restrict the Company’s ability to merge, consolidate or sell assets and its (together with its subsidiaries’) ability to incur liens. These covenants are subject to a number of

13

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

exceptions, including that the Company and its subsidiaries may incur certain liens on assets, mortgages or other liens securing indebtedness if the aggregate amount of indebtedness secured by such liens does not exceed 3.5x Adjusted EBITDA, as defined in the applicable supplemental indenture.

Bank Facilities

Amendments to Bank Facilities—On February 10, 2021, the Company amended and restated its senior unsecured multicurrency revolving credit facility (as amended, the “2021 Multicurrency Credit Facility”) and its senior unsecured revolving credit facility (as amended, the “2021 Credit Facility”) and entered into an amendment agreement with respect to its $1.0 billion unsecured term loan, as amended and restated in December 2019 (as amended, the “2019 Term Loan”).

These amendments, among other things,

i.extend the maturity dates by one year to June 28, 2024 and January 31, 2026 for the 2021 Multicurrency Credit Facility and the 2021 Credit Facility, respectively,

ii.increase the commitments under the 2021 Multicurrency Credit Facility and the 2021 Credit Facility to $4.1 billion and $2.9 billion, respectively, of which 1.3 billion EUR borrowed under the 2021 Multicurrency Credit Facility is to be reserved to finance the Pending Telxius Acquisition (as defined in note 14),

iii.increase the maximum Revolving Loan Commitments, after giving effect to any Incremental Commitments (each as defined in the loan agreements for each of the 2021 Multicurrency Credit Facility and the 2021 Credit Facility) to $6.1 billion and $4.4 billion under the 2021 Multicurrency Credit Facility and the 2021 Credit Facility, respectively,

iv.expand the sublimit for multicurrency borrowings under the 2021 Multicurrency Credit Facility from $1.0 billion to $3.0 billion and add a EUR borrowing option for the 2021 Credit Facility with a $1.5 billion sublimit,

v.amend the limitation of the Company’s permitted ratio of Total Debt to Adjusted EBITDA (each as defined in each of the loan agreements for each of the facilities) to be no greater than 7.50 to 1.00 for the four fiscal quarters following the consummation of the Pending Telxius Acquisition, stepping down to 6.00 to 1.00 thereafter (with a further step up to 7.00 to 1.00 if the Company consummates a Qualified Acquisition (as defined in each of the loan agreements for the facilities)),

vi.amend the limitation on indebtedness of, and guaranteed by, the Company’s subsidiaries to the greater of (a) $3.0 billion and (b) 50% of Adjusted EBITDA (as defined in each of the loan agreements for the facilities) of the Company and its subsidiaries on a consolidated basis and

vii.increase the threshold for certain defaults with respect to judgments, attachments or acceleration of indebtedness from $400.0 million to $500.0 million.

2021 Multicurrency Credit Facility—During the three months ended March 31, 2021, the Company borrowed an aggregate of $1.8 billion and repaid an aggregate of $1.6 billion of revolving indebtedness under the 2021 Multicurrency Credit Facility. The Company used the borrowings to repay existing indebtedness, including the InSite Debt and its $750.0 million unsecured term loan due February 12, 2021 (the “2020 Term Loan”), and for general corporate purposes.

2021 Credit Facility—During the three months ended March 31, 2021, the Company borrowed an aggregate of $50.0 million and made no repayments of revolving indebtedness under the 2021 Credit Facility. The Company used the borrowings for general corporate purposes.

Repayment of the 2020 Term Loan—On February 5, 2021, the Company repaid all amounts outstanding under the 2020 Term Loan with borrowings from the 2021 Multicurrency Credit Facility and cash on hand.

14

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

2021 Delayed Draw Term Loans—On February 10, 2021, the Company entered into (i) a 1.1 billion EUR (approximately $1.3 billion at the date of signing) unsecured term loan, the proceeds of which are to be used to fund the Pending Telxius Acquisition, with a maturity date that is 364 days from the date of the first draw thereunder and that bears interest at a rate based on the senior unsecured debt rating of the Company, which, based on the Company’s current debt ratings, is 1.000% above the Euro Interbank Offered Rate (“EURIBOR”) (the “2021 364-Day Delayed Draw Term Loan”) and (ii) an 825.0 million EUR (approximately $1.0 billion at the date of signing) unsecured term loan, the proceeds of which are to be used to fund the Pending Telxius Acquisition, with a maturity date that is three years from the date of the first draw thereunder and that bears interest at a rate based on the senior unsecured debt rating of the Company, which, based on the Company’s current debt ratings, is 1.125% above EURIBOR (the “2021 Three Year Delayed Draw Term Loan,” and, together with the 2021 364-Day Delayed Draw Term Loan, the “2021 Delayed Draw Term Loans”).

The loan agreements for the 2021 Delayed Draw Term Loans contain certain reporting, information, financial and operating covenants and other restrictions (including limitations on additional debt, guaranties, sales of assets and liens) with which the Company must comply. Failure to comply with the financial and operating covenants of the loan agreements could not only prevent the Company from being able to borrow additional funds under the revolving credit facilities, but may constitute a default, which could result in, among other things, the amounts outstanding, including all accrued interest and unpaid fees, becoming immediately due and payable.

Bridge Facility—In connection with entering into the Pending Telxius Acquisition, the Company entered into a commitment letter (the “Commitment Letter”), dated January 13, 2021, with Bank of America, N.A. and BofA Securities, Inc. (together, “BofA”) pursuant to which BofA has, with respect to bridge financing, committed to provide up to 7.5 billion EUR (approximately $9.1 billion at the date of signing) in bridge loans (the “Bridge Loan Commitment”) to ensure financing for the Pending Telxius Acquisition. Effective February 10, 2021, the Bridge Loan Commitment was reduced to 4.275 billion EUR (approximately $5.2 billion at the date of signing) as a result of an aggregate of 3.225 billion EUR (approximately $3.9 billion at the date of signing) of additional committed amounts under the 2021 Multicurrency Credit Facility, the 2021 Credit Facility and the 2021 Delayed Draw Term Loans, as described above.

The Commitment Letter contains, and the credit agreement in respect of the Bridge Loan Commitment, if any, will contain, certain customary conditions to funding, including, without limitation, (i) the execution and delivery of definitive financing agreements for the Bridge Loan Commitment and (ii) other customary closing conditions set forth in the Commitment Letter. The Company will pay certain customary commitment fees and, in the event it makes any borrowings in connection with the Bridge Loan Commitment, funding and other fees.

India Credit Facility—During the three months ended March 31, 2021, the Company entered into a working capital facility in India with a borrowing capacity of 1.0 billion Indian Rupees (“INR”) (approximately $13.7 million). The working capital facility is subject to annual renewal and bears interest at a rate equal to the one-month India Treasury Bill rate at the time of borrowing plus a spread. As of March 31, 2021, the Company has not borrowed under this facility.

As of March 31, 2021, the key terms under the 2021 Multicurrency Credit Facility, the 2021 Credit Facility, the 2019 Term Loan, the 2021 364-Day Delayed Draw Term Loan, the 2021 Three Year Delayed Draw Term Loan and the Bridge Loan Commitment were as follows:

	Outstanding Principal Balance (in millions)		Undrawn letters of credit (in millions)		Maturity Date		Current margin over LIBOR or EURIBOR (1)		Current commitment fee (2)
2021 Multicurrency Credit Facility	$	270.0	$	3.8	June 28, 2024	(3)	1.125	%	0.110	%
2021 Credit Facility	$	2,345.0	$	0.8	January 31, 2026	(3)	1.125	%	0.110	%
2019 Term Loan	$	1,000.0	N/A		January 31, 2025		1.125	%	N/A
2021 364-Day Delayed Draw Term Loan	—		N/A		N/A	(4)	1.000	%	0.110	%
2021 Three Year Delayed Draw Term Loan	—		N/A		N/A	(4)	1.125	%	0.110	%
Bridge Loan Commitment (5)	—		N/A		N/A	(5)	1.125	%	0.110	%

_______________

(1)LIBOR, which means the London Interbank Offered Rate, applies to the 2021 Multicurrency Credit Facility, the 2021 Credit Facility and the 2019 Term Loan. EURIBOR, which means the Euro Interbank Offered Rate, applies to the 2021 Delayed Draw Term Loans and the Bridge Loan Commitment.

15

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

(2)Fee on undrawn portion of each credit facility.

(3)Subject to two optional renewal periods.

(4)The maturity dates for the 2021 364-Day Delayed Draw Term Loan and the 2021 Three Year Delayed Draw Term Loan are 364 days and three years, respectively, from the date of the first borrowing under each facility. As of March 31, 2021, no borrowings were made under these facilities, and as such, no maturity dates have been set. The Company’s ability to borrow thereunder is subject to the occurrence of certain conditions related to the Pending Telxius Acquisition, as set forth in the agreements for the 2021 Delayed Draw Term Loans.

(5)The Bridge Loan Commitment includes subfacilities relating to the various tranches of closings under the Pending Telxius Acquisition. The maturity dates of the subfacilities are 364 days from the first closing date pursuant to such tranche. Each subfacility is subject to a duration fee that applies to the outstanding principal balance beginning 90 days after the related acquisition closing date. As of March 31, 2021, there have been no closings related to the Pending Telxius Acquisition, and as such, no maturity dates have been set and no duration fees apply.

7.    FAIR VALUE MEASUREMENTS

The Company determines the fair value of its financial instruments based on the fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Below are the three levels of inputs that may be used to measure fair value:

Level 1	Quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
Level 2	Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3	Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Items Measured at Fair Value on a Recurring Basis—The fair values of the Company’s financial assets and liabilities that are required to be measured on a recurring basis at fair value were as follows:

	March 31, 2021					December 31, 2020
	Fair Value Measurements Using					Fair Value Measurements Using
	Level 1		Level 2		Level 3	Level 1		Level 2		Level 3
Assets:
Interest rate swap agreements	—		$	24.5	—	—		$	29.2	—
Liabilities:
Interest rate swap agreements	—		$	0.0	—	—		$	0.1	—
Fair value of debt related to interest rate swap agreements (1)	$	26.3	—		—	$	31.4	—		—

_______________

(1)Included in the carrying values of the corresponding debt obligations.

During the three months ended March 31, 2021, the Company made no changes to the methods described in note 12 to its consolidated financial statements included in the 2020 Form 10-K that it used to measure the fair value of its interest rate swap agreements.

 Items Measured at Fair Value on a Nonrecurring Basis

Assets Held and Used—The Company’s long-lived assets are recorded at amortized cost and, if impaired, are adjusted to fair value using Level 3 inputs. During the three months ended March 31, 2021 and 2020, the Company recorded $0.6 million and $3.7 million of impairments, respectively. There were no other items measured at fair value on a nonrecurring basis during the three months ended March 31, 2021 or 2020.

16

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

Fair Value of Financial Instruments—The Company’s financial instruments for which the carrying value reasonably approximates fair value at March 31, 2021 and December 31, 2020 include cash and cash equivalents, restricted cash, accounts receivable and accounts payable. The Company’s estimates of fair value of its long-term obligations, including the current portion, are based primarily upon reported market values. For long-term debt not actively traded, fair value is estimated using either indicative price quotes or a discounted cash flow analysis using rates for debt with similar terms and maturities. As of March 31, 2021 and December 31, 2020, the carrying value of long-term obligations, including the current portion, was $29.3 billion. As of March 31, 2021, the fair value of long-term obligations, including the current portion, was $30.4 billion, of which $24.3 billion was measured using Level 1 inputs and $6.1 billion was measured using Level 2 inputs. As of December 31, 2020, the fair value of long-term obligations, including the current portion, was $31.4 billion, of which $24.0 billion was measured using Level 1 inputs and $7.4 billion was measured using Level 2 inputs.

8.    INCOME TAXES

The Company provides for income taxes at the end of each interim period based on the estimated effective tax rate (“ETR”) for the full fiscal year. Cumulative adjustments to the Company’s estimate are recorded in the interim period in which a change in the estimated annual ETR is determined. Under the provisions of the Internal Revenue Code of 1986, as amended, the Company may deduct amounts distributed to stockholders against the income generated by its real estate investment trust (“REIT”) operations. The Company continues to be subject to income taxes on the income of its domestic taxable REIT subsidiaries and income taxes in foreign jurisdictions where it conducts operations. In addition, the Company is able to offset certain income by utilizing its net operating losses, subject to specified limitations.

The Company provides valuation allowances if, based on the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. Management assesses the available evidence to estimate if sufficient future taxable income will be generated to use the existing deferred tax assets.

The increase in the income tax provision during the three months ended March 31, 2021 as compared to the three months ended March 31, 2020 was primarily attributable to an increase in foreign earnings in the current period and higher benefits related to foreign exchange losses during the three months ended March 31, 2020.

As of March 31, 2021 and December 31, 2020, the total unrecognized tax benefits that would impact the ETR, if recognized, were approximately $104.7 million and $105.9 million, respectively. The amount of unrecognized tax benefits during the three months ended March 31, 2021 includes (i) reductions due to foreign currency exchange rate fluctuations of $2.2 million, (ii) reductions to the Company’s prior year tax positions of $1.5 million and (iii) additions to the Company’s existing tax positions of $1.2 million. Unrecognized tax benefits are expected to change over the next 12 months if certain tax matters ultimately settle with the applicable taxing jurisdiction during this time frame, as described in note 13 to the Company’s consolidated financial statements included in the 2020 Form 10-K. The impact of the amount of these changes to previously recorded uncertain tax positions could range from zero to $34.2 million.

The Company recorded the following penalties and income tax-related interest expense during the three months ended March 31, 2021 and 2020:

	Three Months Ended March 31,
	2021		2020
Penalties and income tax-related interest expense	$	3.7	$	1.7

As of March 31, 2021 and December 31, 2020, the total amount of accrued income tax related interest and penalties included in the consolidated balance sheets were $37.1 million and $34.4 million, respectively.

9.    STOCK-BASED COMPENSATION

Summary of Stock-Based Compensation Plans—The Company maintains equity incentive plans that provide for the grant of stock-based awards to its directors, officers and employees. The 2007 Equity Incentive Plan, as amended (the “2007 Plan”), provides for the grant of non-qualified and incentive stock options, as well as restricted stock units, restricted stock and other stock-based awards. Exercise prices for non-qualified and incentive stock options are not less than the fair value of the underlying common stock on the date of grant. Equity awards typically vest ratably, generally over four years for time-based restricted stock units (“RSUs”) and stock options and three years for performance-based restricted stock units (“PSUs”). Stock options generally expire ten years from the date of grant. As of March 31, 2021, the Company had the ability to grant stock-based awards with respect to an aggregate of 5.9 million shares of common

17

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

stock under the 2007 Plan. In addition, the Company maintains an employee stock purchase plan (the “ESPP”) pursuant to which eligible employees may purchase shares of the Company’s common stock on the last day of each bi-annual offering period at a 15% discount from the lower of the closing market value on the first or last day of such offering period. The offering periods run from June 1 through November 30 and from December 1 through May 31 of each year.

During the three months ended March 31, 2021 and 2020, the Company recorded and capitalized the following stock-based compensation expense:

	Three Months Ended March 31,
	2021 (1)		2020 (2)
Stock-based compensation expense	$	38.0	$	47.7
Total stock-based compensation expense	$	38.0	$	47.7

_______________

(1)For the three months ended March 31, 2021, stock-based compensation expense consisted of $38.0 million included in selling, general, administrative and development expense.

(2)For the three months ended March 31, 2020, stock-based compensation expense consisted of (i) $0.6 million included in Property costs of operations, (ii) $0.3 million included in Services costs of operations and (iii) $46.8 million included in selling, general, administrative and development expense. For the three months ended March 31, 2020, stock-based compensation expense capitalized as property and equipment was $0.5 million.

Stock Options—As of March 31, 2021, total unrecognized compensation expense related to unvested stock options was less than $0.1 million, which is expected to be recognized over a weighted average period of less than one year.

The Company’s option activity for the three months ended March 31, 2021 was as follows (shares disclosed in full amounts):

	Number of Options
Outstanding as of January 1, 2021	2,016,261
Exercised	(23,958)
Forfeited	—
Expired	—
Outstanding as of March 31, 2021	1,992,303

Restricted Stock Units—As of March 31, 2021, total unrecognized compensation expense related to unvested RSUs granted under the 2007 Plan was $197.7 million and is expected to be recognized over a weighted average period of approximately three years. Vesting of RSUs is subject generally to the employee’s continued employment or death, disability or qualified retirement (each as defined in the applicable RSU award agreement).

Performance-Based Restricted Stock Units—During the three months ended March 31, 2021, the Company’s Compensation Committee (the “Compensation Committee”) granted an aggregate of 92,312 PSUs (the “2021 PSUs”) to its executive officers and established the performance metrics for these awards. During the years ended December 31, 2020 and 2019, the Compensation Committee granted an aggregate of 110,925 PSUs (the “2020 PSUs”) and 114,823 PSUs (the “2019 PSUs”), respectively, to its executive officers and established the performance metrics for these awards. Threshold, target and maximum parameters were established for the metrics for a three-year performance period with respect to each of the 2021 PSUs, the 2020 PSUs and the 2019 PSUs and will be used to calculate the number of shares that will be issuable when each award vests, which may range from zero to 200% of the target amounts. At the end of each three-year performance period, the number of shares that vest will depend on the degree of achievement against the pre-established performance goals. PSUs will be paid out in common stock at the end of each performance period, subject generally to the executive’s continued employment or death, disability or qualified retirement (each as defined in the applicable PSU award agreement). PSUs will accrue dividend equivalents prior to vesting, which will be paid out only in respect of shares that actually vest.

Restricted Stock Units and Performance-Based Restricted Stock Units—The Company’s RSU and PSU activity for the three months ended March 31, 2021 was as follows (shares disclosed in full amounts): 

18

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

	RSUs	PSUs
Outstanding as of January 1, 2021 (1)	1,245,075	320,510
Granted (2)	538,239	92,312
Vested and Released (3)	(547,567)	(66,834)
Forfeited	(13,424)	—
Outstanding as of March 31, 2021	1,222,323	345,988
Vested and deferred as of March 31, 2021 (4)	—	96,048

_______________

(1)PSUs consist of the target number of shares issuable at the end of the three-year performance period for the outstanding 2020 PSUs and the outstanding 2019 PSUs, or 70,739 and 86,889 shares, respectively, and the shares issuable at the end of the three-year performance period for the PSUs granted in 2018 (the “2018 PSUs”) based on achievement against the performance metrics for the three-year performance period, or 162,882 shares.

(2)PSUs consist of the target number of shares issuable at the end of the three-year performance period for the 2021 PSUs, or 92,312 shares.

(3)This includes 58,204 of previously vested and deferred RSUs. PSUs consist of shares vested pursuant to the 2018 PSUs. There are no additional shares to be earned related to the 2018 PSUs.

(4)Vested and deferred PSUs are related to deferred compensation for certain former employees.

During the three months ended March 31, 2021, the Company recorded $1.5 million in stock-based compensation expense for equity awards in which the performance goals have been established and were probable of being achieved. The remaining unrecognized compensation expense related to these awards at March 31, 2021 was $20.8 million based on the Company’s current assessment of the probability of achieving the performance goals. The weighted average period over which the cost will be recognized is approximately three years.

10.    REDEEMABLE NONCONTROLLING INTERESTS

India Redeemable Noncontrolling Interests—On April 21, 2016, the Company, through its wholly owned subsidiary, ATC Asia Pacific Pte. Ltd., acquired a 51% controlling ownership interest in ATC TIPL (formerly Viom), a telecommunications infrastructure company that owns and operates wireless communications towers and indoor DAS networks in India (the “Viom Acquisition”), which was subsequently merged with the Company’s existing India property operations.

In connection with the Viom Acquisition, the Company, through one of its subsidiaries, entered into a shareholders agreement (the “Shareholders Agreement”) with Viom and the following remaining Viom shareholders: Tata Sons Limited (“Tata Sons”), Tata Teleservices Limited (“Tata Teleservices”), IDFC Private Equity Fund III (“IDFC”), Macquarie SBI Infrastructure Investments Pte Limited and SBI Macquarie Infrastructure Trust (together, “Macquarie,” and, collectively with Tata Sons, Tata Teleservices and IDFC, the “Remaining Shareholders”).

The Shareholders Agreement also provides the Remaining Shareholders with put options, which allow them to sell outstanding shares of ATC TIPL to the Company, and the Company with call options, which allow it to buy the noncontrolling shares of ATC TIPL. The put options, which are not under the Company’s control, cannot be separated from the noncontrolling interests. As a result, the combination of the noncontrolling interests and the redemption feature requires classification as redeemable noncontrolling interests in the consolidated balance sheet, separate from equity.

During the three months ended March 31, 2021, the Company made no changes to the methods of determining redemption value described in note 15 to its consolidated financial statements included in the 2020 Form 10-K.

During the year ended December 31, 2020, the Company redeemed 100% of Tata Teleservices and Tata Sons’ remaining combined holdings of ATC TIPL for total consideration of INR 24.8 billion ($337.3 million at the date of redemption). As a result of the redemption, the Company’s controlling interest in ATC TIPL increased from 79% to 92% and the noncontrolling interest decreased from 21% to 8%.

During the three months ended March 31, 2021, the Company entered into an agreement with Macquarie to redeem 100% of their combined holdings in ATC TIPL at a price of INR 175 per share, subject to certain adjustments. Accordingly, the Company expects to pay an amount equivalent to INR 12.9 billion (approximately $176.5 million) to redeem the shares in 2021, subject to regulatory approval. After the completion of the redemption, the Company will hold a 100% ownership interest in ATC TIPL.

Other Redeemable Noncontrolling Interests—During the year ended December 31, 2020, the Company completed the acquisition of MTN Group Limited’s noncontrolling interests in each of the Company’s joint ventures in Ghana and Uganda for total consideration of approximately $524.4 million, including a net adjustment of $1.4 million made during

19

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

the three months ended March 31, 2020, which resulted in an increase in the Company’s controlling interests in such joint ventures from 51% to 100%.

In 2019, the Company, through a subsidiary of ATC Europe, entered into an agreement with its local partners in France to form Eure-et-Loir Réseaux Mobiles SAS (“Eure-et-Loir”), a telecommunications infrastructure company that owned and operated wireless communications towers in France. During the three months ended March 31, 2021, the Company liquidated its interests in Eure-et-Loir for total consideration of 2.2 million EUR (approximately $2.5 million at the date of redemption).

The changes in Redeemable noncontrolling interests were as follows:

	Three Months Ended March 31,
	2021		2020
Balance as of January 1,	$	212.1	$	1,096.5
Net income attributable to noncontrolling interests	2.3		7.7
Adjustment to noncontrolling interest redemption value	1.2		(6.3)
Purchase of redeemable noncontrolling interest	(2.5)		(524.4)
Foreign currency translation adjustment attributable to noncontrolling interests	(0.2)		(32.1)
Balance as of March 31,	$	212.9	$	541.4

11.    EQUITY

Sales of Equity Securities—The Company receives proceeds from sales of its equity securities pursuant to the ESPP and upon exercise of stock options granted under the 2007 Plan. During the three months ended March 31, 2021, the Company received an aggregate of $1.9 million in proceeds upon exercises of stock options.

2020 “At the Market” Stock Offering Program—In August 2020, the Company established an “at the market” stock offering program through which it may issue and sell shares of its common stock having an aggregate gross sales price of up to $1.0 billion (the “2020 ATM Program”). Sales under the 2020 ATM Program may be made by means of ordinary brokers’ transactions on the New York Stock Exchange or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or, subject to specific instructions of the Company, at negotiated prices. The Company intends to use the net proceeds from any issuances under the 2020 ATM Program for general corporate purposes, which may include, among other things, the funding of acquisitions, additions to working capital and repayment or refinancing of existing indebtedness. As of March 31, 2021, the Company has not sold any shares of common stock under the 2020 ATM Program.

Stock Repurchase Programs—In March 2011, the Company’s Board of Directors approved a stock repurchase program, pursuant to which the Company is authorized to repurchase up to $1.5 billion of its common stock (the “2011 Buyback”). In December 2017, the Board of Directors approved an additional stock repurchase program, pursuant to which the Company is authorized to repurchase up to $2.0 billion of its common stock (the “2017 Buyback,” and, together with the 2011 Buyback, the “Buyback Programs”).

During the three months ended March 31, 2021, there were no repurchases under either of the Buyback Programs. As of March 31, 2021, the Company has repurchased a total of 14,361,283 shares of its common stock under the 2011 Buyback for an aggregate of $1.5 billion, including commissions and fees. As of March 31, 2021, the Company has not made any repurchases under the 2017 Buyback.

Under the Buyback Programs, the Company is authorized to purchase shares from time to time through open market purchases, in privately negotiated transactions not to exceed market prices, and (with respect to such open market purchases) pursuant to plans adopted in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, in accordance with securities laws and other legal requirements and subject to market conditions and other factors.

The Company expects to fund any further repurchases of its common stock through a combination of cash on hand, cash generated by operations and borrowings under its credit facilities. Repurchases under the Buyback Programs are subject to, among other things, the Company having available cash to fund the repurchases.

20

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

Distributions—During the three months ended March 31, 2021, the Company declared or paid the following cash distributions (per share data reflects actual amounts):

Declaration Date	Payment Date	Record Date	Distribution per share		Aggregate Payment Amount (1)
Common Stock
March 4, 2021	April 29, 2021	April 13, 2021	$	1.24	$	551.5
December 3, 2020	February 2, 2021	December 28, 2020	$	1.21	$	537.6

_______________

(1)Does not include amounts accrued for distributions payable related to unvested restricted stock units.

During the three months ended March 31, 2020, the Company declared or paid the following cash distributions (per share data reflects actual amounts):

Declaration Date	Payment Date	Record Date	Distribution per share		Aggregate Payment Amount (1)
Common Stock
March 12, 2020	April 29, 2020	April 14, 2020	$	1.08	$	478.8
December 11, 2019	January 14, 2020	December 27, 2019	$	1.01	$	447.3

_______________

(1)Does not include amounts accrued for distributions payable related to unvested restricted stock units.

The Company accrues distributions on unvested restricted stock units, which are payable upon vesting. As of March 31, 2021, the amount accrued for distributions payable related to unvested restricted stock units was $7.6 million. During the three months ended March 31, 2021 and 2020, the Company paid $7.3 million and $7.6 million of distributions upon the vesting of restricted stock units, respectively. To maintain its qualification for taxation as a REIT, the Company expects to continue paying distributions, the amount, timing and frequency of which will be determined, and subject to adjustment, by the Company’s Board of Directors.

Dividend to noncontrolling interest— The Company’s joint ventures may, from time to time, declare dividends. During the year ended December 31, 2020, ATC Europe declared a dividend of 13.2 million EUR (approximately $16.2 million accrued as of December 31, 2020) payable in cash to the Company and PGGM in proportion to their respective equity interests in the joint venture. The dividend was paid on January 6, 2021.

Purchase of Interests—During the three months ended March 31, 2021, the Company purchased the remaining minority interests held in a subsidiary for an aggregate purchase price of $6.0 million of unregistered shares of the Company’s common stock, in lieu of cash. The Company now owns 100% of the subsidiary as a result of the purchase.

12.    EARNINGS PER COMMON SHARE

The following table sets forth basic and diluted net income per common share computational data (shares in thousands, except per share data):

	Three Months Ended March 31,
	2021		2020
Net income attributable to American Tower Corporation common stockholders	$	645.0	$	415.0
Basic weighted average common shares outstanding	444,486		443,055
Dilutive securities	1,808		2,777
Diluted weighted average common shares outstanding	446,294		445,832
Basic net income attributable to American Tower Corporation common stockholders per common share	$	1.45	$	0.94
Diluted net income attributable to American Tower Corporation common stockholders per common share	$	1.45	$	0.93

Shares Excluded From Dilutive Effect—The following shares were not included in the computation of diluted earnings per share because the effect would be anti-dilutive (in thousands, on a weighted average basis):

21

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

	Three Months Ended March 31,
	2021	2020
Restricted stock units	—	86

13.    COMMITMENTS AND CONTINGENCIES

Litigation—The Company periodically becomes involved in various claims, lawsuits and proceedings that are incidental to its business. In the opinion of Company management, after consultation with counsel, there are no matters currently pending that would, in the event of an adverse outcome, materially impact the Company’s consolidated financial position, results of operations or liquidity.

Verizon Transaction—In March 2015, the Company entered into an agreement with various operating entities of Verizon Communications Inc. (“Verizon”) that currently provides for the lease, sublease or management of approximately 11,250 wireless communications sites commencing March 27, 2015. The average term of the lease or sublease for all sites at the inception of the agreement was approximately 28 years, assuming renewals or extensions of the underlying ground leases for the sites. The Company has the option to purchase the leased sites in tranches, subject to the applicable lease, sublease or management rights upon its scheduled expiration. Each tower is assigned to an annual tranche, ranging from 2034 to 2047, which represents the outside expiration date for the sublease rights to the towers in that tranche. The purchase price for each tranche is a fixed amount stated in the lease for such tranche plus the fair market value of certain alterations made to the related towers. The aggregate purchase option price for the towers leased and subleased is approximately $5.0 billion. Verizon will occupy the sites as a tenant for an initial term of ten years with eight optional successive five-year terms; each such term shall be governed by standard master lease agreement terms established as a part of the transaction.

AT&T Transaction—The Company has an agreement with SBC Communications Inc., a predecessor entity to AT&T Inc. (“AT&T”), that currently provides for the lease or sublease of approximately 2,100 towers commencing between December 2000 and August 2004. Substantially all of the towers are part of the securitization transactions completed in March 2013 and March 2018. The average term of the lease or sublease for all sites at the inception of the agreement was approximately 27 years, assuming renewals or extensions of the underlying ground leases for the sites. The Company has the option to purchase the sites subject to the applicable lease or sublease upon its expiration. Each tower is assigned to an annual tranche, ranging from 2013 to 2032, which represents the outside expiration date for the sublease rights to that tower. The purchase price for each site is a fixed amount stated in the lease for that site plus the fair market value of certain alterations made to the related tower by AT&T. As of March 31, 2021, the Company has purchased an aggregate of 331 of the subleased towers which are subject to the applicable agreement. The aggregate purchase option price for the remaining towers leased and subleased is $997.0 million and includes per annum accretion through the applicable expiration of the lease or sublease of a site. For all such sites, AT&T has the right to continue to lease the reserved space through June 30, 2025 at the then-current monthly fee, which shall escalate in accordance with the standard master lease agreement for the remainder of AT&T’s tenancy. Thereafter, AT&T shall have the right to renew such lease for up to five successive five-year terms.

Other Contingencies—The Company is subject to income tax and other taxes in the geographic areas where it holds assets or operates, and periodically receives notifications of audits, assessments or other actions by taxing authorities. Taxing authorities may issue notices or assessments while audits are being conducted. In certain jurisdictions, taxing authorities may issue assessments with minimal examination. These notices and assessments do not represent amounts that the Company is obligated to pay and are often not reflective of the actual tax liability for which the Company will ultimately be liable. In the process of responding to assessments of taxes that the Company believes are not enforceable, the Company avails itself of both administrative and judicial remedies. The Company evaluates the circumstances of each notification or assessment based on the information available and, in those instances in which the Company does not anticipate a successful defense of positions taken in its tax filings, a liability is recorded in the appropriate amount based on the underlying assessment.

On December 5, 2016, the Company received an income tax assessment of Essar Telecom Infrastructure Private Limited (“ETIPL”) from the India Income Tax Department (the “Tax Department”) for the fiscal year ending 2008 in the amount of INR 4.75 billion ($69.8 million on the date of assessment) related to capital contributions. The Company challenged the assessment before the Office of Commissioner of Income Tax - Appeals, which ruled in the Company’s favor in January 2018. However, the Tax Department has appealed this ruling at a higher appellate authority. The Company estimates that there is a more likely than not probability that the Company’s position will be sustained upon appeal. Accordingly, no liability has been recorded. Additionally, the assessment was made with respect to transactions

22

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

that took place in the tax year commencing in 2007, prior to the Company’s acquisition of ETIPL. Under the Company’s definitive acquisition agreement with ETIPL, the seller is obligated to indemnify and defend the Company with respect to any tax-related liability that may arise from activities prior to March 31, 2010.

Guaranties and Indemnifications— If the Company is unable to close the Pending Telxius Acquisition, the Company would be liable under the terms of the agreements to make certain payments to Telxius (each as defined below), which could be material.

14.    ACQUISITIONS

Impact of current year acquisitions—The Company typically acquires communications sites and other communications infrastructure assets from wireless carriers or other tower operators and subsequently integrates those sites and related assets into its existing portfolio of communications sites and related assets. The financial results of the Company’s acquisitions have been included in the Company’s consolidated statements of operations for the three months ended March 31, 2021 from the date of the respective acquisition. The date of acquisition, and by extension the point at which the Company begins to recognize the results of an acquisition, may depend on, among other things, the receipt of contractual consents, the commencement and extent of leasing arrangements and the timing of the transfer of title or rights to the assets, which may be accomplished in phases. Sites acquired from communications service providers may never have been operated as a business and may instead have been utilized solely by the seller as a component of its network infrastructure. An acquisition may or may not involve the transfer of business operations or employees.

The Company evaluates each of its acquisitions under the accounting guidance framework to determine whether to treat an acquisition as an asset acquisition or a business combination. For those transactions treated as asset acquisitions, the purchase price is allocated to the assets acquired, with no recognition of goodwill.

For those acquisitions accounted for as business combinations, the Company recognizes acquisition and merger related expenses in the period in which they are incurred and services are received; for transactions accounted for as asset acquisitions, these costs are capitalized as part of the purchase price. Acquisition and merger related costs may include finder’s fees, advisory, legal, accounting, valuation and other professional or consulting fees and general administrative costs directly related to completing the transaction. Integration costs include incremental and non-recurring costs necessary to convert data, retain employees and otherwise enable the Company to operate acquired businesses or assets efficiently. The Company records acquisition and merger related expenses for business combinations, as well as integration costs for all acquisitions, in Other operating expenses in the consolidated statements of operations.

During the three months ended March 31, 2021 and 2020, the Company recorded acquisition and merger related expenses for business combinations and non-capitalized asset acquisition costs and integration costs as follows:

	Three Months Ended March 31,
	2021		2020
Acquisition and merger related expenses	$	34.6	$	7.6
Integration costs	$	16.6	$	6.6

During the three months ended March 31, 2021, the Company also recorded benefits of $4.0 million related to pre-acquisition contingencies and settlements. The increase in acquisition and merger related costs during the three months ended March 31, 2021 was primarily associated with the Pending Telxius Acquisition (as defined below).

2021 Transactions

The estimated aggregate impact of the acquisitions completed in 2021 on the Company’s revenues and gross margin for the three months ended March 31, 2021 was approximately $0.5 million and $0.4 million, respectively. The revenues and gross margin amounts also reflect incremental revenues from the addition of new tenants to such sites subsequent to the transaction date.

Entel Acquisition—On December 19, 2019, the Company entered into a definitive agreement to acquire approximately 3,200 communications sites in Chile and Peru from Entel PCS Telecomunicaciones S.A. and Entel Peru S.A. for total consideration of approximately $0.8 billion (as of the date of signing). The Company completed the acquisition of approximately 2,400 communications sites in December 2019 and an additional 530 communications sites pursuant to this agreement during the year ended December 31, 2020. During the three months ended March 31, 2021, the Company completed the acquisition of an additional 50 communications sites pursuant to this agreement for an aggregate total

23

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

purchase price of $14.7 million (as of the dates of acquisition), including value added tax, which are being accounted for as an acquisition of assets and are included in the table below. The remaining communications sites are expected to continue to close in tranches, subject to certain closing conditions.

Other Acquisitions—During the three months ended March 31, 2021, the Company acquired a total of 66 communications sites as well as other communications infrastructure assets in the United States, Mexico and Peru, for an aggregate purchase price of $62.5 million. Of the aggregate purchase price, $4.0 million is reflected as a payable in the consolidated balance sheet as of March 31, 2021. These acquisitions were accounted for as asset acquisitions.

The following table summarizes the allocations of the purchase prices for the fiscal year 2021 acquisitions based upon their estimated fair value at the date of acquisition:

	Allocation (1)
Current assets	$	0.3
Property and equipment	22.5
Intangible assets (2):
Tenant-related intangible assets	37.3
Network location intangible assets	15.7
Other intangible assets	—
Other non-current assets	5.8
Current liabilities	(1.0)
Deferred tax liability	—
Other non-current liabilities	(3.4)
Net assets acquired	77.2
Goodwill	—
Fair value of net assets acquired	77.2
Debt assumed	—
Purchase price	$	77.2

_______________

(1)Includes 12 sites in Peru held pursuant to long-term finance leases.

(2)Tenant-related intangible assets and network location intangible assets are amortized on a straight-line basis generally over a 20 year period.

Other Signed Acquisitions

Orange Acquisition—On November 28, 2019, ATC France, a majority-owned subsidiary of the Company, entered into definitive agreements with Orange S.A. for the acquisition of up to approximately 2,000 communications sites in France over a period of up to five years for total consideration in the range of approximately 500.0 million EUR to 600.0 million EUR (approximately $550.5 million to $660.5 million at the date of signing) to be paid over the five-year term. The Company completed the acquisition of 564 of these sites during the year ended December 31, 2020. Subsequent to March 31, 2021, the Company completed the acquisition of an additional 81 communications sites. The remaining communications sites are expected to close in tranches, subject to customary closing conditions.

Pending Telxius Acquisition—On January 13, 2021, the Company entered into two agreements with Telxius Telecom, S.A. (“Telxius”), a subsidiary of Telefónica, S.A., pursuant to which the Company expects to acquire Telxius’ European and Latin American tower divisions, comprising approximately 31,000 communications sites in Argentina, Brazil, Chile, Germany, Peru and Spain, for approximately 7.7 billion EUR (approximately $9.4 billion at the date of signing) (the “Pending Telxius Acquisition”), subject to certain adjustments. As of April 28, 2021, the Company has received all required government and regulatory approvals in Germany and Spain and expects to close on the majority of the European sites in the second quarter of 2021, with approximately 4,000 sites in Germany expected to close in the third quarter of 2021. The Latin American sites are expected to close either late in the second quarter or in the third quarter of 2021, subject to customary closing conditions, including government and regulatory approval.

2020 Transactions

InSite Acquisition—On December 23, 2020, the Company acquired 100% of the outstanding units of IWG Holdings, LLC, the parent company of InSite, which owned, operated and managed approximately 3,000 communications sites in

24

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

the U.S. and Canada. The portfolio included approximately 1,400 owned towers in the United States, over 200 owned towers in Canada and approximately 40 DAS networks in the United States. In addition, the portfolio included more than 600 land parcels under communications sites in the United States, Canada and Australia, as well as approximately 400 rooftop sites. The total consideration for the InSite Acquisition, including cash acquired, the repayment and assumption of certain debt held by InSite, was approximately $3.5 billion, subject to certain post-closing adjustments. The InSite Acquisition was accounted for as a business combination and is subject to post-closing adjustments. During the three months ended March 31, 2021, certain adjustments were made to reduce assets by $3.1 million and increase liabilities by $18.2 million with a corresponding increase in goodwill of $21.3 million and there were no other material post-closing adjustments. The full reconciliation and finalization of the assets acquired and liabilities assumed, including those subject to valuation, have not been completed and, as a result, there may be additional post-closing adjustments.

Pro Forma Consolidated Results (Unaudited)

The following table presents the unaudited pro forma financial results as if the 2021 acquisitions had occurred on January 1, 2020 and the 2020 acquisitions had occurred on January 1, 2019. The pro forma results do not include any anticipated cost synergies, costs or other integration impacts. Accordingly, such pro forma amounts are not necessarily indicative of the results that actually would have occurred had the transactions been completed on the date indicated, nor are they indicative of the future operating results of the Company.

	Three Months Ended March 31,
	2021		2020
Pro forma revenues	$	2,158.9	$	2,044.6
Pro forma net income attributable to American Tower Corporation common stockholders	$	644.9	$	369.8
Pro forma net income per common share amounts:
Basic net income attributable to American Tower Corporation common stockholders	$	1.45	$	0.83
Diluted net income attributable to American Tower Corporation common stockholders	$	1.45	$	0.83

15.    BUSINESS SEGMENTS

The Company’s primary business is leasing space on multitenant communications sites to wireless service providers, radio and television broadcast companies, wireless data providers, government agencies and municipalities and tenants in a number of other industries. This business is referred to as the Company’s property operations.

During the fourth quarter of 2020, as a result of the InSite Acquisition, the Company updated its reportable segments to rename U.S. property and Asia property to U.S. & Canada property and Asia-Pacific property, respectively. The Company continues to report its results in six segments – U.S. & Canada property, Asia-Pacific property, Africa property, Europe property, Latin America property and services. The change in reportable segment names is solely reflective of the inclusion of Canada and Australia in the Company’s business operations, as a result of the InSite Acquisition, and had no impact on the Company’s consolidated financial statements or historical segment financial information for any prior periods.

As of March 31, 2021, the Company’s property operations consisted of the following:

•U.S. & Canada: property operations in Canada and the United States;

•Asia-Pacific: property operations in Australia and India;

•Africa: property operations in Burkina Faso, Ghana, Kenya, Niger, Nigeria, South Africa and Uganda;

•Europe: property operations in France, Germany and Poland; and

•Latin America: property operations in Argentina, Brazil, Chile, Colombia, Costa Rica, Mexico, Paraguay and Peru.

The Company’s services segment offers tower-related services in the United States, including AZP and structural analysis, which primarily support its site leasing business, including the addition of new tenants and equipment on its sites. The services segment is a strategic business unit that offers different services from, and requires different resources, skill sets and marketing strategies than, the property operating segments.

The accounting policies applied in compiling segment information below are similar to those described in note 1 to the Company’s consolidated financial statements included in the 2020 Form 10-K and as updated in note 1 above. Among other factors, in evaluating financial performance in each business segment, management uses segment gross margin and

25

AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

segment operating profit. The Company defines segment gross margin as segment revenue less segment operating expenses excluding stock-based compensation expense recorded in costs of operations; Depreciation, amortization and accretion; Selling, general, administrative and development expense; and Other operating expenses. The Company defines segment operating profit as segment gross margin less Selling, general, administrative and development expense attributable to the segment, excluding stock-based compensation expense and corporate expenses. These measures of segment gross margin and segment operating profit are also before Interest income, Interest expense, Gain (loss) on retirement of long-term obligations, Other income (expense), Net income (loss) attributable to noncontrolling interests and Income tax benefit (provision). The categories of expenses indicated above, such as depreciation, have been excluded from segment operating performance as they are not considered in the review of information or the evaluation of results by management. There are no significant revenues resulting from transactions between the Company’s operating segments. All intercompany transactions are eliminated to reconcile segment results and assets to the consolidated statements of operations and consolidated balance sheets.

Summarized financial information concerning the Company’s reportable segments for the three months ended March 31, 2021 and 2020 is shown in the following tables. The “Other” column (i) represents amounts excluded from specific segments, such as business development operations, stock-based compensation expense and corporate expenses included in Selling, general, administrative and development expense; Other operating expenses; Interest income; Interest expense; Gain (loss) on retirement of long-term obligations; and Other income (expense), and (ii) reconciles segment operating profit to Income from continuing operations before income taxes.

	Property										Total  Property		Services		Other		Total
Three Months Ended March 31, 2021	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America
Segment revenues	$	1,231.3	$	281.4	$	235.7	$	44.6	$	336.7	$	2,129.7	$	28.8			$	2,158.5
Segment operating expenses	197.9		175.5		80.9		7.8		101.2		563.3		11.0				574.3
Segment gross margin	1,033.4		105.9		154.8		36.8		235.5		1,566.4		17.8				1,584.2
Segment selling, general, administrative and development expense (1)	39.3		7.1		18.9		5.6		23.3		94.2		4.2				98.4
Segment operating profit	$	994.1	$	98.8	$	135.9	$	31.2	$	212.2	$	1,472.2	$	13.6			$	1,485.8
Stock-based compensation expense															$	38.0	38.0
Other selling, general, administrative and development expense															46.2		46.2
Depreciation, amortization and accretion															522.5		522.5
Other expense (2)															176.5		176.5
Income from continuing operations before income taxes																	$	702.6
Total assets	$	27,331.9	$	5,214.1	$	4,905.4	$	1,836.7	$	7,127.2	$	46,415.3	$	59.4	$	467.8	$	46,942.5

_______________

(1)Segment selling, general, administrative and development expenses exclude stock-based compensation expense of $38.0 million.

(2)Primarily includes interest expense.

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AMERICAN TOWER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED AND CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(tabular amounts in millions, unless otherwise noted)

	Property										Total  Property		Services		Other		Total
Three Months Ended March 31, 2020	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America
Segment revenues	$	1,089.9	$	286.6	$	225.5	$	34.5	$	336.7	$	1,973.2	$	19.9			$	1,993.1
Segment operating expenses (1)	190.0		164.0		77.7		6.6		105.2		543.5		7.6				551.1
Segment gross margin	899.9		122.6		147.8		27.9		231.5		1,429.7		12.3				1,442.0
Segment selling, general, administrative and development expense (1)	42.0		32.6		17.1		5.5		26.6		123.8		3.5				127.3
Segment operating profit	$	857.9	$	90.0	$	130.7	$	22.4	$	204.9	$	1,305.9	$	8.8			$	1,314.7
Stock-based compensation expense															$	47.7	47.7
Other selling, general, administrative and development expense															43.7		43.7
Depreciation, amortization and accretion															472.3		472.3
Other expense (2)															311.3		311.3
Income from continuing operations before income taxes																	$	439.7
Total assets	$	22,486.9	$	4,986.0	$	4,510.3	$	1,554.5	$	6,739.0	$	40,276.7	$	29.0	$	483.4	$	40,789.1

_______________

(1)Segment operating expenses and segment selling, general, administrative and development expenses exclude stock-based compensation expense of $0.9 million and $46.8 million, respectively.

(2)Primarily includes interest expense.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

This Quarterly Report on Form 10-Q (this “Quarterly Report”) contains forward-looking statements relating to our goals, beliefs, plans or current expectations and other statements that are not of historical facts. For example, when we use words such as “project,” “believe,” “anticipate,” “expect,” “forecast,” “estimate,” “intend,” “should,” “would,” “could,” “may” or other words that convey uncertainty of future events or outcomes, we are making forward-looking statements. Certain important factors may cause actual results to differ materially from those indicated by our forward-looking statements, including those set forth under the caption “Risk Factors” in Part I, Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2020 (the “2020 Form 10-K”). Forward-looking statements represent management’s current expectations and are inherently uncertain. We do not undertake any obligation to update forward-looking statements made by us.

The discussion and analysis of our financial condition and results of operations that follow are based upon our consolidated and condensed consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”). The preparation of our financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and the related disclosure of contingent assets and liabilities at the date of our financial statements. Actual results may differ from these estimates and such differences could be material to the financial statements. This discussion should be read in conjunction with our consolidated and condensed consolidated financial statements herein and the accompanying notes, information set forth under the caption “Critical Accounting Policies and Estimates” in the 2020 Form 10-K, and in particular, the information set forth therein under Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

During the fourth quarter of 2020, as a result of the acquisition of InSite Wireless Group, LLC (“InSite,” and the acquisition, the “InSite Acquisition”), we updated our reportable segments to rename U.S. property and Asia property to U.S. & Canada property and Asia-Pacific property, respectively. We continue to report our results in six segments – U.S. & Canada property, Asia-Pacific property, Africa property, Europe property, Latin America property and services (see note 15 to our consolidated and condensed consolidated financial statements included in this Quarterly Report). The change in reportable segment names was solely reflective of the inclusion of Canada and Australia in our business operations, as a result of the InSite Acquisition, and had no impact on our consolidated financial statements or historical segment financial information for any prior periods.

Overview

We are one of the largest global real estate investment trusts and a leading independent owner, operator and developer of multitenant communications real estate. Our primary business is the leasing of space on communications sites to wireless service providers, radio and television broadcast companies, wireless data providers, government agencies and municipalities and tenants in a number of other industries. In addition to the communications sites in our portfolio, we manage rooftop and tower sites for property owners under various contractual arrangements. We also hold other telecommunications infrastructure, fiber and property interests that we lease primarily to communications service providers and third-party tower operators. We refer to the business encompassing the above as our property operations, which accounted for 99% of our total revenues for the three months ended March 31, 2021 and includes our U.S. & Canada property, Asia-Pacific property, Africa property, Europe property and Latin America property segments.

We also offer tower-related services in the United States, including site application, zoning and permitting and structural analysis, which primarily support our site leasing business, including the addition of new tenants and equipment on our sites.

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The following table details the number of communications sites, excluding managed sites, that we owned or operated as of March 31, 2021: 

	Number of Owned Towers	Number of Operated  Towers (1)	Number of Owned DAS Sites
U.S. & Canada:
Canada	211	—	—
United States	27,140	15,430	441
U.S. & Canada total	27,351	15,430	441
Asia-Pacific: (2)
India	75,258	—	1,018
Asia-Pacific total	75,258	—	1,018
Africa:
Burkina Faso	707	—	—
Ghana	3,323	663	28
Kenya	2,590	—	9
Niger	719	—	—
Nigeria	6,030	—	—
South Africa	2,837	—	—
Uganda	3,454	—	12
Africa total	19,660	663	49
Europe:
France	2,776	309	9
Germany	2,221	—	—
Poland	27	—	—
Europe total	5,024	309	9
Latin America:
Argentina	125	—	10
Brazil	16,793	2,167	104
Chile	3,054	—	23
Colombia	4,986	—	4
Costa Rica	669	—	2
Mexico	9,535	186	92
Paraguay	1,431	—	—
Peru	1,943	441	—
Latin America total	38,536	2,794	235

_______________

(1)Approximately 95% of the operated towers are held pursuant to long-term finance leases, including those subject to purchase options.

(2)We also control land under carrier or other third-party communication sites in Australia, which provides recurring cash flow through tenant leasing arrangements.

On January 13, 2021, we entered into two agreements with Telxius Telecom, S.A. (“Telxius”), a subsidiary of Telefónica, S.A., pursuant to which we expect to acquire approximately 31,000 communications sites in Argentina, Brazil, Chile, Germany, Peru and Spain, for approximately 7.7 billion Euros (“EUR”) (approximately $9.4 billion at the time of signing) (the “Pending Telxius Acquisition”) at closing, subject to certain conditions and limited adjustments. As of April 28, 2021, we have received all required government and regulatory approvals in Germany and Spain and expect to close on the majority of the European sites in the second quarter of 2021, with approximately 4,000 sites in Germany expected to close in the third quarter of 2021. The Latin American sites are expected to close either late in the second quarter or in the third quarter of 2021, subject to customary closing conditions, including government and regulatory approval. The impact of the Pending Telxius Acquisition on our 2021 results of operations will be dependent on a number of factors, including the timing of any closings.

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We operate in six reportable segments: U.S. & Canada property, Asia-Pacific property, Africa property, Europe property, Latin America property and services. In evaluating operating performance in each business segment, management uses, among other factors, segment gross margin and segment operating profit (see note 15 to our consolidated and condensed consolidated financial statements included in this Quarterly Report).

The 2020 Form 10-K contains information regarding management’s expectations of long-term drivers of demand for our communications sites, as well as key trends, which management believes provide valuable insight into our operating and financial resource allocation decisions. The discussion below should be read in conjunction with the 2020 Form 10-K and, in particular, the information set forth therein under Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Executive Overview.”

In most of our markets, our tenant leases with wireless carriers generally have initial non-cancellable terms of five to ten years with multiple renewal terms. Accordingly, the vast majority of the revenue generated by our property operations during the three months ended March 31, 2021 was recurring revenue that we should continue to receive in future periods. Based upon existing tenant leases and foreign currency exchange rates as of March 31, 2021, we expect to generate over $60 billion of non-cancellable tenant lease revenue over future periods, before the impact of straight-line lease accounting. Most of our tenant leases have provisions that periodically increase the rent due under the lease, typically based on an annual fixed escalation (averaging approximately 3% in the United States) or an inflationary index in most of our international markets, or a combination of both. In addition, certain of our tenant leases provide for additional revenue primarily to cover costs (pass-through revenue), such as ground rent or power and fuel costs.

The revenues generated by our property operations may be affected by cancellations of existing tenant leases. As discussed above, most of our tenant leases with wireless carriers and broadcasters are multiyear contracts, which typically are non-cancellable; however, in some instances, a lease may be cancelled upon the payment of a termination fee. Revenue lost from either tenant lease cancellations or the non-renewal of leases or rent renegotiations, which we refer to as churn, has historically not had a material adverse effect on the revenues generated by our consolidated property operations. During the three months ended March 31, 2021, churn was approximately 3% of our tenant billings.

Beginning in late 2017, we experienced an increase in revenue lost from cancellations or non-renewals primarily due to carrier consolidation-driven churn in India, which compressed our gross margin and operating profit, particularly in our Asia-Pacific property segment, although this impact was partially offset by lower expenses due to reduced tenancy on existing sites and the decommissioning of certain sites. For the three months ended March 31, 2021, aggregate carrier consolidation in India did not have a material impact on our consolidated property revenue, gross margin or operating profit, although overall churn rates in India remained elevated relative to historical levels.

We anticipate that our churn rate in India will moderate over time and result in reduced impacts on our property revenue, gross margin and operating profit. In the immediate term, we believe that our churn rate may remain elevated as our tenants in India evaluate how to best comply with rulings by the Indian Supreme Court and determine their obligations under payment plans for the adjusted gross revenue (“AGR”) fees and charges prescribed by such court, as set forth in Item 1A of the 2020 Form 10-K, under the caption “Risk Factors—Our business, and that of our tenants, is subject to laws, regulations and administrative and judicial decisions, and changes thereto, that could restrict our ability to operate our business as we currently do or impact our competitive landscape.” We expect to periodically evaluate the carrying value of our Indian assets, which may result in the realization of additional impairment expense or other similar charges. For more information, please see Item 7 of the 2020 Form 10-K under the caption “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates.”

Additionally, we expect that our churn rate in our U.S. & Canada property segment will be elevated for a period of several years due to contractual lease cancellations and non-renewals by T-Mobile, including legacy Sprint Corporation leases, pursuant to the terms of our master lease agreement with T-Mobile US, Inc. (the “T-Mobile MLA”) entered into in September 2020.

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As further set forth under the caption “Risk Factors” in Part I, Item 1A of the 2020 Form 10-K, the ongoing coronavirus (“COVID-19”) pandemic, as well as the response to mitigate its spread and effects, may adversely impact us and our tenants and the demand for our communications sites in the United States and globally. We have taken a variety of actions to ensure the continued availability of our communications sites, while ensuring the safety and security of our employees, tenants, vendors and surrounding communities. These measures include providing support for our tenants remotely, requiring continued work-from-home arrangements and restricting travel for our employees where practicable and other modifications to our business practices. We will continue to actively monitor the situation and may take further actions as may be required by governmental authorities or that we determine are in the best interests of our employees, tenants and business partners.

In 2020, as a result of the impact of COVID-19 on global financial markets, we experienced volatility in foreign currency exchange rates in many of the markets in which we operate, although we do not expect significant impacts from exchange rate fluctuations in 2021. If exchange rates become significantly more unfavorable, the impact to our revenue and other future operating results could be material. Additionally, the impact of COVID-19 on our operational results in subsequent periods will largely depend on future developments, which are highly uncertain and cannot be accurately predicted at this time. These developments may include, but are not limited to, new information concerning the severity and duration of the COVID-19 pandemic, the degree of success of actions taken to contain or treat COVID-19, including the availability and effectiveness of vaccines and treatments, and the reactions by consumers, companies, governmental entities and capital markets to such actions.

Non-GAAP Financial Measures

Included in our analysis of our results of operations are discussions regarding earnings before interest, taxes, depreciation, amortization and accretion, as adjusted (“Adjusted EBITDA”), Funds From Operations, as defined by the National Association of Real Estate Investment Trusts (“Nareit FFO”) attributable to American Tower Corporation common stockholders, Consolidated Adjusted Funds From Operations (“Consolidated AFFO”) and AFFO attributable to American Tower Corporation common stockholders.

We define Adjusted EBITDA as Net income before Income (loss) from equity method investments; Income tax benefit (provision); Other income (expense); Gain (loss) on retirement of long-term obligations; Interest expense; Interest income; Other operating income (expense); Depreciation, amortization and accretion; and stock-based compensation expense.

Nareit FFO attributable to American Tower Corporation common stockholders is defined as net income before gains or losses from the sale or disposal of real estate, real estate related impairment charges, real estate related depreciation, amortization and accretion and dividends on preferred stock, and including adjustments for (i) unconsolidated affiliates and (ii) noncontrolling interests. In this section, we refer to Nareit FFO attributable to American Tower Corporation common stockholders as “Nareit FFO (common stockholders).”

We define Consolidated AFFO as Nareit FFO (common stockholders) before (i) straight-line revenue and expense; (ii) stock-based compensation expense; (iii) the deferred portion of income tax; (iv) non-real estate related depreciation, amortization and accretion; (v) amortization of deferred financing costs, capitalized interest, debt discounts and premiums and long-term deferred interest charges; (vi) other income (expense); (vii) gain (loss) on retirement of long-term obligations; (viii) other operating income (expense); and adjustments for (ix) unconsolidated affiliates and (x) noncontrolling interests, less cash payments related to capital improvements and cash payments related to corporate capital expenditures.

We define AFFO attributable to American Tower Corporation common stockholders as Consolidated AFFO, excluding the impact of noncontrolling interests on both Nareit FFO (common stockholders) and the other adjustments included in the calculation of Consolidated AFFO. In this section, we refer to AFFO attributable to American Tower Corporation common stockholders as “AFFO (common stockholders).”

Adjusted EBITDA, Nareit FFO (common stockholders), Consolidated AFFO and AFFO (common stockholders) are not intended to replace net income or any other performance measures determined in accordance with GAAP. None of Adjusted EBITDA, Nareit FFO (common stockholders), Consolidated AFFO or AFFO (common stockholders) represents cash flows from operating activities in accordance with GAAP and, therefore, these measures should not be considered indicative of cash flows from operating activities, as a measure of liquidity or a measure of funds available to fund our cash needs, including our ability to make cash distributions. Rather, Adjusted EBITDA, Nareit FFO (common stockholders), Consolidated AFFO and AFFO (common stockholders) are presented as we believe each is a useful indicator of our current operating performance. We believe that these metrics are useful to an investor in evaluating our

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operating performance because (1) each is a key measure used by our management team for decision making purposes and for evaluating our operating segments’ performance; (2) Adjusted EBITDA is a component underlying our credit ratings; (3) Adjusted EBITDA is widely used in the telecommunications real estate sector to measure operating performance as depreciation, amortization and accretion may vary significantly among companies depending upon accounting methods and useful lives, particularly where acquisitions and non-operating factors are involved; (4) Consolidated AFFO is widely used in the telecommunications real estate sector to adjust Nareit FFO (common stockholders) for items that may otherwise cause material fluctuations in Nareit FFO (common stockholders) growth from period to period that would not be representative of the underlying performance of property assets in those periods; (5) each provides investors with a meaningful measure for evaluating our period-to-period operating performance by eliminating items that are not operational in nature; and (6) each provides investors with a measure for comparing our results of operations to those of other companies, particularly those in our industry.

Our measurement of Adjusted EBITDA, Nareit FFO (common stockholders), Consolidated AFFO and AFFO (common stockholders) may not, however, be fully comparable to similarly titled measures used by other companies. Reconciliations of Adjusted EBITDA, Nareit FFO (common stockholders), Consolidated AFFO and AFFO (common stockholders) to net income, the most directly comparable GAAP measure, have been included below.

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Results of Operations

Three Months Ended March 31, 2021 and 2020

(in millions, except percentages)

Revenue

	Three Months Ended March 31,				Percent Increase (Decrease)
	2021		2020
Property
U.S. & Canada	$	1,231.3	$	1,089.9	13	%
Asia-Pacific	281.4		286.6		(2)
Africa	235.7		225.5		5
Europe	44.6		34.5		29
Latin America	336.7		336.7		0
Total property	2,129.7		1,973.2		8
Services	28.8		19.9		45
Total revenues	$	2,158.5	$	1,993.1	8	%

Three Months Ended March 31, 2021

U.S. & Canada property segment revenue growth of $141.4 million was attributable to:

• Tenant billings growth of $78.5 million, which was driven by:

• $42.6 million generated from sites acquired or constructed since the beginning of the prior-year period (“newly acquired or constructed sites”), primarily related to the InSite Acquisition;

• $27.9 million due to leasing additional space on our sites (“colocations”) and amendments; and

• $10.2 million from contractual escalations, net of churn (as discussed above, we expect that our churn rate will be elevated for a period of several years due to the terms of the T-Mobile MLA);

•Partially offset by a decrease of $2.2 million from other tenant billings; and

• An increase of $62.9 million in other revenue, which includes a $61.3 million increase due to straight-line accounting, primarily due to the impact of the T-Mobile MLA.

Segment revenue growth was not meaningfully impacted by foreign currency translation related to fluctuations in the Canadian Dollar. During the three months ended March 31, 2021, the assets acquired pursuant to the InSite Acquisition generated approximately $40.0 million in property revenue.

Asia-Pacific property segment revenue decrease of $5.2 million was attributable to:

• A decrease of $6.5 million in other revenue;

• Partially offset by an increase of $1.6 million in pass-through revenue and an increase of $3.1 million in tenant billings, which was driven by:

• $12.9 million due to colocations and amendments; and

• $5.6 million generated from newly acquired or constructed sites;

• Partially offset by:

▪A decrease of $15.1 million resulting from churn in excess of contractual escalations; and

▪A decrease of $0.3 million from other tenant billings.

Segment revenue decline included a decrease of $3.4 million attributable to the negative impact of foreign currency translation related to fluctuations in Indian Rupee (“INR”).

Africa property segment revenue growth of $10.2 million was attributable to:

• Tenant billings growth of $18.1 million, which was driven by:

• $9.4 million due to colocations and amendments;

• $6.2 million generated from newly acquired or constructed sites; 

• $1.7 million from contractual escalations, net of churn; and

• $0.8 million from other tenant billings;

• Partially offset by:

• A decrease of $4.1 million in other revenue, primarily due to a decrease in tenant settlement payments received attributable to prior tenant cancellations; and

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• A decrease of $0.2 million in pass-through revenue.

Segment revenue growth included a decrease of $3.6 million attributable to the impact of foreign currency translation, which included, among others, negative impacts of $2.5 million related to fluctuations in Nigerian Naira, $2.1 million related to fluctuations in Kenyan Schilling and $1.8 million related to fluctuations in Ghanaian Cedi, partially offset by positive impacts related to fluctuations in the currencies of our other African markets.

Europe property segment revenue growth of $10.1 million was attributable to:

• Tenant billings growth of $3.3 million, which was driven by:

• $2.3 million generated from newly acquired or constructed sites, primarily attributable to our agreements with Orange S.A.;

• $1.3 million due to colocations and amendments; and

• $0.1 million from other tenant billings;

• Partially offset by a decrease of $0.4 million resulting from churn in excess of contractual escalations; and

• An increase of $2.9 million in other revenue.

Segment revenue growth included an increase of $3.9 million attributable to the positive impact of foreign currency translation related to fluctuations in EUR.

Latin America property segment revenue remained consistent as compared to the prior-year period, which was attributable to:

• An increase of $21.2 million in tenant billings, which was driven by:

• $8.5 million from contractual escalations, net of churn;

• $8.3 million due to colocations and amendments;

• $3.2 million generated from newly acquired or constructed sites; and

• $1.2 million from other tenant billings;

• An increase of $8.0 million in pass-through revenue; and

• An increase of $4.3 million in other revenue.

Segment revenue included a decrease of $33.5 million attributable to the negative impact of foreign currency translation, which included, among others, $30.6 million related to fluctuations in Brazilian Real and $3.5 million related to fluctuations in Mexican Peso.

The increase in services segment revenue of $8.9 million was primarily attributable to an increase in site application, zoning and permitting services.

Gross Margin

	Three Months Ended March 31,				Percent Increase (Decrease)
	2021		2020
Property
U.S. & Canada	$	1,033.4	$	899.9	15	%
Asia-Pacific	105.9		122.6		(14)
Africa	154.8		147.8		5
Europe	36.8		27.9		32
Latin America	235.5		231.5		2
Total property	1,566.4		1,429.7		10
Services	17.8		12.3		45	%

Three Months Ended March 31, 2021

•The increase in U.S. & Canada property segment gross margin was primarily attributable to the increase in revenue described above, partially offset by an increase in direct expenses of $7.9 million.

•The decrease in Asia-Pacific property segment gross margin was primarily attributable to an increase in direct expenses of $13.6 million, primarily due to a combination of (i) an increase in costs associated with pass-

34

through revenue, including fuel costs, and (ii) an increase in property taxes, and the decrease in revenue described above. Direct expenses also benefited by $2.1 million from the impact of foreign currency translation.

•The increase in Africa property segment gross margin was primarily attributable to the increase in revenue described above, partially offset by an increase in direct expenses of $5.3 million. Direct expenses also benefited by $2.1 million from the impact of foreign currency translation.

•The increase in Europe property segment gross margin was primarily attributable to the increase in revenue described above, partially offset by an increase in direct expenses of $0.6 million. Direct expenses were also negatively impacted by $0.6 million from the impact of foreign currency translation.

•The increase in Latin America property segment gross margin was primarily attributable to a $10.0 million benefit to direct expenses attributable to the impact of foreign currency translation, partially offset by an increase in direct expenses of $6.0 million.

•The increase in services segment gross margin was primarily due to the increase in revenue described above, partially offset by an increase in direct expenses of $3.4 million.

Selling, General, Administrative and Development Expense (“SG&A”)

	Three Months Ended March 31,				Percent Increase (Decrease)
	2021		2020
Property
U.S. & Canada	$	39.3	$	42.0	(6)	%
Asia-Pacific	7.1		32.6		(78)
Africa	18.9		17.1		11
Europe	5.6		5.5		2
Latin America	23.3		26.6		(12)
Total property	94.2		123.8		(24)
Services	4.2		3.5		20
Other	84.2		90.5		(7)
Total selling, general, administrative and development expense	$	182.6	$	217.8	(16)	%

Three Months Ended March 31, 2021

•The decrease in our U.S. & Canada property segment SG&A was primarily driven by decreased personnel costs and lower canceled construction costs as well as lower travel and discretionary spending as a result of the COVID-19 pandemic and stay-at-home orders.

•The decrease in our Asia-Pacific property segment SG&A was primarily driven by a decrease in bad debt expense of $24.8 million due to collections from a tenant.

•The increase in our Africa property segment SG&A was primarily driven by increased personnel costs to support our business and an increase in bad debt expense of $1.1 million as a result of receivable reserves with certain tenants.

•Europe property segment SG&A was relatively consistent as compared to the prior-year period.

•The decrease in our Latin America property segment SG&A was primarily driven by (i) decreased personnel costs, (ii) lower travel and discretionary spending as a result of the COVID-19 pandemic and stay-at-home orders and (iii) the benefit of foreign currency translation on SG&A.

•The increase in our services segment SG&A was primarily driven by an increase in personnel costs, partially offset by lower travel and discretionary spending as a result of the COVID-19 pandemic and stay-at-home orders.

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•The decrease in other SG&A was primarily attributable to a decrease in stock-based compensation expense of $8.8 million, partially offset by an increase in corporate SG&A.

Operating Profit

	Three Months Ended March 31,				Percent Increase (Decrease)
	2021		2020
Property
U.S. & Canada	$	994.1	$	857.9	16	%
Asia-Pacific	98.8		90.0		10
Africa	135.9		130.7		4
Europe	31.2		22.4		39
Latin America	212.2		204.9		4
Total property	1,472.2		1,305.9		13
Services	13.6		8.8		55	%

•The increases in operating profit for the three months ended March 31, 2021 for our U.S. & Canada and Latin America property segments were primarily attributable to increases in our segment gross margin and decreases in our segment SG&A.

•The increase in operating profit for the three months ended March 31, 2021 for our Asia-Pacific property segment was primarily attributable a decrease in our segment SG&A, partially offset by the decrease in our segment gross margin.

•The increases in operating profit for the three months ended March 31, 2021 for our Africa and Europe property segments and our services segment were primarily attributable to increases in our segment gross margin, partially offset by increases in our segment SG&A.

Depreciation, Amortization and Accretion

	Three Months Ended March 31,				Percent Increase (Decrease)
	2021		2020
Depreciation, amortization and accretion	$	522.5	$	472.3	11	%

The increase in depreciation, amortization and accretion expense for the three months ended March 31, 2021 was primarily attributable to the acquisition, lease or construction of new sites since the beginning of the prior-year period, which resulted in increases in property and equipment and intangible assets subject to amortization, partially offset by foreign currency exchange rate fluctuations.

Other Operating Expenses

	Three Months Ended March 31,				Percent Increase (Decrease)
	2021		2020
Other operating expenses	$	50.4	$	14.2	255	%

The increase in other operating expenses during the three months ended March 31, 2021 was primarily attributable to an increase in acquisition related costs, including pre-acquisition contingencies and settlements of $33.0 million, primarily associated with the Pending Telxius Acquisition.

Total Other Expense

	Three Months Ended March 31,				Percent Increase (Decrease)
	2021		2020
Total other expense	$	126.1	$	297.1	(58)	%

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Total other expense consists primarily of interest expense and realized and unrealized foreign currency gains and losses. We record unrealized foreign currency gains or losses as a result of foreign currency exchange rate fluctuations primarily associated with our intercompany notes and similar unaffiliated balances denominated in a currency other than the subsidiaries’ functional currencies.

The decrease in total other expense during the three months ended March 31, 2021 was primarily due to foreign currency gains of $94.7 million in the current period, as compared to foreign currency losses of $65.5 million in the prior-year period. The decrease also includes a lower loss on retirement of long-term obligations in the current period, attributable to the repayment of all amounts outstanding under the securitizations assumed in connection with the InSite Acquisition (the “InSite Debt”), as compared to the loss on the retirement of long-term obligations in the prior-year period, attributable to the retirement of the 5.900% senior unsecured notes due 2021.

Income Tax Provision

	Three Months Ended March 31,						Percent Increase (Decrease)
	2021			2020
Income tax provision	$	50.3		$	21.1		138	%
Effective tax rate	7.2		%	4.8		%

As a real estate investment trust for U.S. federal income tax purposes (“REIT”), we may deduct earnings distributed to stockholders against the income generated by our REIT operations. In addition, we are able to offset certain income by utilizing our net operating losses (“NOLs”), subject to specified limitations. Consequently, the effective tax rate on income from continuing operations for the three months ended March 31, 2021 and 2020 differs from the federal statutory rate.

The increase in the income tax provision during the three months ended March 31, 2021 was primarily attributable to an increase in foreign earnings in the current period and higher benefits related to foreign exchange losses during the three months ended March 31, 2020.

Net Income / Adjusted EBITDA and Net Income / Nareit FFO attributable to American Tower Corporation common stockholders / Consolidated AFFO / AFFO attributable to American Tower Corporation common stockholders 

	Three Months Ended March 31,				Percent Increase (Decrease)
	2021		2020
Net income	$	652.3	$	418.6	56	%
Income tax provision	50.3		21.1		138
Other (income) expense	(95.2)		63.8		(249)
Loss on retirement of long-term obligations	25.7		34.6		(26)
Interest expense	207.0		208.8		(1)
Interest income	(11.4)		(10.1)		13
Other operating expenses	50.4		14.2		255
Depreciation, amortization and accretion	522.5		472.3		11
Stock-based compensation expense	38.0		47.7		(20)
Adjusted EBITDA	$	1,439.6	$	1,271.0	13	%

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	Three Months Ended March 31,				Percent Increase (Decrease)
	2021		2020
Net income	$	652.3	$	418.6	56	%
Real estate related depreciation, amortization and accretion	467.0		419.5		11
Losses from sale or disposal of real estate and real estate related impairment charges (1)	6.2		7.5		(17)
Adjustments for unconsolidated affiliates and noncontrolling interests	(20.1)		(26.4)		(24)
Nareit FFO attributable to American Tower Corporation common stockholders	$	1,105.4	$	819.2	35	%
Straight-line revenue	(119.9)		(56.2)		113
Straight-line expense	15.0		12.7		18
Stock-based compensation expense	38.0		47.7		(20)
Deferred portion of income tax	44.5		(14.0)		(418)
Non-real estate related depreciation, amortization and accretion	55.5		52.8		5
Amortization of deferred financing costs, capitalized interest, debt discounts and premiums and long-term deferred interest charges	8.6		7.9		9
Payment of shareholder loan interest (2)	—		(63.3)		(100)
Other (income) expense (3)	(95.2)		63.8		(249)
Loss on retirement of long-term obligations	25.7		34.6		(26)
Other operating expense (4)	44.2		6.7		560
Capital improvement capital expenditures	(18.4)		(30.3)		(39)
Corporate capital expenditures	(0.9)		(1.4)		(36)
Adjustments for unconsolidated affiliates and noncontrolling interests	20.1		26.4		(24)
Consolidated AFFO	$	1,122.6	$	906.6	24	%
Adjustments for unconsolidated affiliates and noncontrolling interests (5)	(22.8)		38.8		(159)	%
AFFO attributable to American Tower Corporation common stockholders	$	1,099.8	$	945.4	16	%

_______________

(1)Included in these amounts are impairment charges of $0.6 million and $3.7 million, respectively.

(2)For the three months ended March 31, 2020, relates to the payment of capitalized interest associated with the acquisition of MTN Group Limited’s (“MTN”) redeemable noncontrolling interests in each of our joint ventures in Ghana and Uganda (see note 10 to our consolidated and condensed consolidated financial statements included in this Quarterly Report). This long-term deferred interest payment was previously expensed but excluded from Consolidated AFFO.

(3)Includes gains (losses) on foreign currency exchange rate fluctuations of $94.7 million and ($65.5 million), respectively.

(4)Primarily includes acquisition-related costs and integration costs. 

(5)Includes adjustments for the impact on both Nareit FFO attributable to American Tower Corporation common stockholders as well as the other line items included in the calculation of Consolidated AFFO. 

The increase in net income for the three months ended March 31, 2021 was primarily due to (i) an increase in our operating profit, (ii) a decrease in other expenses and (iii) a decrease in loss on retirement of long-term obligations, partially offset by (i) an increase in depreciation, amortization and accretion expense, (ii) an increase in other operating expense, primarily attributable to acquisition related costs associated with the Pending Telxius Acquisition and (iii) an increase in the income tax provision.

The increase in Adjusted EBITDA for the three months ended March 31, 2021 was primarily attributable to the increase in our gross margin and the decrease in SG&A, excluding the impact of stock-based compensation expense of $26.4 million.

The growth in Consolidated AFFO and AFFO attributable to American Tower Corporation common stockholders for the three months ended March 31, 2021 was primarily attributable to (i) the increase in our operating profit, excluding the impact of straight-line accounting, (ii) decreases in cash paid for interest and cash paid for taxes and (iii) a decrease in capital improvement capital expenditures. The growth in Consolidated AFFO also benefited from the non-recurrence of previously deferred interest associated with the shareholder loan recognized during the three months ended March 31, 2020. The growth in AFFO attributable to American Tower Corporation common stockholders was also impacted by changes in noncontrolling interests held in India and Africa since the beginning of the prior-year period.

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Liquidity and Capital Resources

The information in this section updates as of March 31, 2021 the “Liquidity and Capital Resources” section of the 2020 Form 10-K and should be read in conjunction with that report.

Overview

During the three months ended March 31, 2021, we increased our financial flexibility and our ability to grow our business while maintaining our long-term financial policies. During the three months ended March 31, 2021, our significant financing transactions included:

•Entry into the 2021 Delayed Draw Term Loans and the Bridge Loan Commitment (each as defined below).

•Registered public offerings in an aggregate amount of $1.4 billion of senior unsecured notes with maturities of 2026 and 2031.

•Increase of our commitments under (i) our senior unsecured multicurrency revolving credit facility to $4.1 billion (as amended and restated as further described below, the “2021 Multicurrency Credit Facility”) and (ii) our senior unsecured revolving credit facility to $2.9 billion (as amended and restated as further described below, the “2021 Credit Facility”).

•Repayment of all amounts outstanding under our $750.0 million unsecured term loan due February 12, 2021 (the “2020 Term Loan”).

•Repayment of all amounts outstanding under the InSite Debt.

As a holding company, our cash flows are derived primarily from the operations of, and distributions from, our operating subsidiaries or funds raised through borrowings under our credit facilities and debt or equity offerings.

The following table summarizes the significant components of our liquidity (in millions):

	As of March 31, 2021
Available under the 2021 Multicurrency Credit Facility	$	3,830.0
Available under the 2021 Credit Facility	555.0
Letters of credit	(4.6)
Total available under credit facilities, net	$	4,380.4
Cash and cash equivalents	1,913.6
Total liquidity (1)	$	6,294.0

_______________

(1)Excludes an aggregate of approximately $7.3 billion available under the 2021 Delayed Draw Term Loans and the Bridge Loan Commitment for use to finance the Pending Telxius Acquisition.

Subsequent to March 31, 2021, we made an additional net repayment of $80.0 million under the 2021 Multicurrency Credit Facility and an additional borrowing of $550.0 million under the 2021 Credit Facility.

Summary cash flow information is set forth below (in millions):

	Three Months Ended March 31,
	2021		2020
Net cash provided by (used for):
Operating activities	$	1,092.7	$	800.0
Investing activities	(438.7)		(253.4)
Financing activities	(480.0)		(606.0)
Net effect of changes in foreign currency exchange rates on cash and cash equivalents, and restricted cash	(42.1)		(118.3)
Net increase in cash and cash equivalents, and restricted cash	$	131.9	$	(177.7)

We use our cash flows to fund our operations and investments in our business, including tower maintenance and improvements, communications site construction, managed network installations and tower and land acquisitions. Additionally, we use our cash flows to make distributions, including distributions of our REIT taxable income to maintain our qualification for taxation as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”). We may also repay or repurchase our existing indebtedness or equity from time to time. We typically fund our

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international expansion efforts primarily through a combination of cash on hand, intercompany debt and equity contributions.

In February 2021, we entered into an agreement with Macquarie SBI Infrastructure Investments Pte Limited and SBI Macquarie Infrastructure Trust, our remaining minority holders in ATC Telecom Infrastructure Private Limited (“ATC TIPL”), to redeem 100% of their combined holdings in ATC TIPL (see note 10 to our consolidated and condensed consolidated financial statements included in this Quarterly Report) at a price of INR 175 per share, subject to certain adjustments. Accordingly, we expect to pay an amount equivalent to INR 12.9 billion (approximately $176.5 million) to redeem the shares in 2021, subject to regulatory approval. After the completion of the redemption, we will hold a 100% ownership interest in ATC TIPL.

As of March 31, 2021, we had total outstanding indebtedness of $29.5 billion, with a current portion of $1.3 billion. During the three months ended March 31, 2021, we generated sufficient cash flow from operations, together with borrowings under our credit facilities and cash on hand, to fund our capital expenditures and debt service obligations, as well as our required distributions. We believe the cash generated by operating activities during the year ending December 31, 2021, together with our increased borrowing capacity under our credit facilities, the recently executed 2021 Delayed Draw Term Loans and Bridge Loan Commitment, will be sufficient to fund our required distributions, capital expenditures, debt service obligations (interest and principal repayments) and signed acquisitions. There were no material changes to the Material Cash Requirements section of the 2020 Form 10-K.

As of March 31, 2021, we had $1.5 billion of cash and cash equivalents held by our foreign subsidiaries, of which $611.8 million was held by our joint ventures. While certain subsidiaries may pay us interest or principal on intercompany debt, it has not been our practice to repatriate earnings from our foreign subsidiaries primarily due to our ongoing expansion efforts and related capital needs. However, in the event that we do repatriate any funds, we may be required to accrue and pay certain taxes.

Cash Flows from Operating Activities

The increase in cash provided by operating activities for the three months ended March 31, 2021 was primarily attributable to a decrease in cash required for working capital, primarily as a result of accounts receivable collections, and an increase in the operating profit of our property segments.

Cash Flows from Investing Activities

Our significant investing activities during the three months ended March 31, 2021 are highlighted below:

•We spent $114.8 million for acquisitions.

•We spent $334.5 million for capital expenditures, as follows (in millions):

Discretionary capital projects (1)	$	175.7
Ground lease purchases (2)	48.8
Capital improvements and corporate expenditures (3)	19.3
Redevelopment	41.3
Start-up capital projects	49.4
Total capital expenditures (4)	$	334.5

_______________

(1)Includes the construction of 1,971 communications sites globally.

(2)Includes $9.3 million of perpetual land easement payments reported in Deferred financing costs and other financing activities in the cash flows from financing activities in our condensed consolidated statements of cash flows.

(3)Includes $1.6 million of finance lease payments reported in Repayments of notes payable, credit facilities, senior notes, secured debt, term loan and finance leases in the cash flows from financing activities in our condensed consolidated statements of cash flows.

(4)Net of purchase credits of $1.2 million on certain assets, which are recorded in investing activities in our condensed consolidated statements of cash flows.

We plan to continue to allocate our available capital, after satisfying our distribution requirements, among investment alternatives that meet our return on investment criteria, while maintaining our commitment to our long-term financial policies. Accordingly, we expect to continue to deploy capital through our annual capital expenditure program, including land purchases and new site construction, and through acquisitions. We also regularly review our tower portfolios as to capital expenditures required to upgrade our towers to our structural standards or address capacity, structural or permitting issues. 

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We expect that our 2021 total capital expenditures will be as follows (in millions):

Discretionary capital projects (1)	$	475	to	$	505
Ground lease purchases	$	245	to	$	265
Capital improvements and corporate expenditures	$	165	to	$	175
Redevelopment	$	290	to	$	310
Start-up capital projects	$	200	to	$	220
Total capital expenditures	$	1,375	to	$	1,475

_______________

(1)Includes the construction of approximately 6,000 to 7,000 communications sites globally.

Cash Flows from Financing Activities

Our significant financing activities were as follows (in millions):

	Three Months Ended March 31,
	2021		2020
Proceeds from issuance of senior notes, net	$	1,398.1	$	1,496.0
Proceeds from credit facilities, net	320.0		86.8
Proceeds from term loan	—		750.0
Repayments of term loan	(750.0)		(1,000.0)
Repayments of securitized debt (1)	(763.5)		—
Repayments of senior notes	—		(500.0)
Distributions to noncontrolling interest holders, net	(8.1)		(13.5)
Purchase of redeemable noncontrolling interest (2)	(2.5)		(524.4)
Distributions paid on common stock	(544.9)		(454.9)
Purchases of common stock	—		(39.7)

___________

(1)As of December 31, 2020, the InSite Debt included $763.5 million aggregate principal amount and a fair value adjustment of $36.5 million. During the three months ended March 31, 2021, we repaid all amounts outstanding under the InSite Debt.

(2)During the three months ended March 31, 2021, we liquidated our interests in a company held in France for total consideration of 2.2 million EUR (approximately $2.5 million at the date of redemption). During the three months ended March 31, 2020, we completed the acquisition of MTN’s 49% redeemable noncontrolling interests in each of the our joint ventures in Ghana and Uganda for total consideration of approximately $524.4 million, including an adjustment of $1.4 million.

Offerings of Senior Notes

1.600% Senior Notes and 2.700% Senior Notes Offering—On March 29, 2021, we completed a registered public offering of $700.0 million aggregate principal amount of 1.600% senior unsecured notes due 2026 (the “1.600% Notes”) and $700.0 million aggregate principal amount of 2.700% senior unsecured notes due 2031 (the “2.700% Notes” and, together with the 1.600% Notes, the “Notes”). The net proceeds from this offering were approximately $1,386.3 million, after deducting commissions and estimated expenses. We used all of the net proceeds to repay existing indebtedness under the 2021 Multicurrency Credit Facility.

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)
1.600% Notes	$	700.0	March 29, 2021	April 15, 2026	1.600	%	October 15, 2021	April 15 and October 15	March 15, 2026
2.700% Notes	$	700.0	March 29, 2021	April 15, 2031	2.700	%	October 15, 2021	April 15 and October 15	January 15, 2031

___________

(1)Accrued and unpaid interest 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.

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(2)We 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 we redeem the Notes on or after the par call date, we will not be required to pay a make-whole premium.

If we undergo a change of control and corresponding ratings decline, each as defined in the supplemental indenture for the Notes, we may be required to repurchase all of the Notes at a purchase price equal to 101% of the principal amount of such Notes, plus accrued and unpaid interest (including additional interest, if any), up to but not including the repurchase date. The Notes rank equally with all of our other senior unsecured debt and are structurally subordinated to all existing and future indebtedness and other obligations of our subsidiaries.

The supplemental indenture contains certain covenants that restrict our ability to merge, consolidate or sell assets and our (together with our subsidiaries’) ability to incur liens. These covenants are subject to a number of exceptions, including that we and our subsidiaries may incur certain liens on assets, mortgages or other liens securing indebtedness if the aggregate amount of indebtedness secured by such liens does not exceed 3.5x Adjusted EBITDA, as defined in the applicable supplemental indenture.

Repayment of InSite Debt—The InSite Debt included securitizations entered into by certain InSite subsidiaries. The InSite Debt was recorded at fair value upon acquisition. On January 15, 2021, we repaid the entire amount outstanding under the InSite Debt, plus accrued and unpaid interest up to, but excluding, January 15, 2021, for an aggregate redemption price of $826.4 million, including $2.3 million in accrued and unpaid interest. We recorded a loss on retirement of long-term obligations of approximately $25.7 million, which includes prepayment consideration partially offset by the unamortized fair value adjustment recorded upon acquisition. The repayment of the InSite Debt was funded with borrowings under the 2021 Multicurrency Credit Facility and the 2021 Credit Facility, and cash on hand.

Bank Facilities

Amendments to Bank Facilities—On February 10, 2021, we amended and restated the 2021 Multicurrency Credit Facility and the 2021 Credit Facility and entered into an amendment agreement with respect to our $1.0 billion unsecured term loan, as amended and restated in December 2019 (as amended, the “2019 Term Loan”).

These amendments, among other things,

i.extend the maturity dates by one year to June 28, 2024 and January 31, 2026 for the 2021 Multicurrency Credit Facility and the 2021 Credit Facility, respectively,

ii.increase the commitments under the 2021 Multicurrency Credit Facility and the 2021 Credit Facility to $4.1 billion and $2.9 billion, respectively, of which 1.3 billion EUR borrowed under the 2021 Multicurrency Credit Facility is to be reserved to finance the Pending Telxius Acquisition,

iii.increase the maximum Revolving Loan Commitments, after giving effect to any Incremental Commitments (each as defined in the loan agreements for each of the 2021 Multicurrency Credit Facility and the 2021 Credit Facility) to $6.1 billion and $4.4 billion under the 2021 Multicurrency Credit Facility and the 2021 Credit Facility, respectively,

iv.expand the sublimit for multicurrency borrowings under the 2021 Multicurrency Credit Facility from $1.0 billion to $3.0 billion and add a EUR borrowing option for the 2021 Credit Facility with a $1.5 billion sublimit,

v.amend the limitation of the our permitted ratio of Total Debt to Adjusted EBITDA (each as defined in each of the loan agreements for each of the facilities) to be no greater than 7.50 to 1.00 for the four fiscal quarters following the consummation of the Pending Telxius Acquisition, stepping down to 6.00 to 1.00 thereafter (with a further step up to 7.00 to 1.00 if we consummate a Qualified Acquisition (as defined in each of the loan agreements for the facilities)),

vi.amend the limitation on indebtedness of, and guaranteed by, our subsidiaries to the greater of (a) $3.0 billion and (b) 50% of Adjusted EBITDA (as defined in each of the loan agreements for the facilities) of us and our subsidiaries on a consolidated basis and

vii.increase the threshold for certain defaults with respect to judgments, attachments or acceleration of indebtedness from $400.0 million to $500.0 million.

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2021 Multicurrency Credit Facility—During the three months ended March 31, 2021, we borrowed an aggregate of $1.8 billion and repaid an aggregate of $1.6 billion of revolving indebtedness under the 2021 Multicurrency Credit Facility. We used the borrowings to repay existing indebtedness, including the InSite Debt and the 2020 Term Loan, and for general corporate purposes. We currently have $3.8 million of undrawn letters of credit and maintain the ability to draw down and repay amounts under the 2021 Multicurrency Credit Facility in the ordinary course.

2021 Credit Facility—During the three months ended March 31, 2021, we borrowed an aggregate of $50.0 million and made no repayments of revolving indebtedness under the 2021 Credit Facility. We used the borrowings for general corporate purposes. We currently have $0.8 million of undrawn letters of credit and maintain the ability to draw down and repay amounts under the 2021 Credit Facility in the ordinary course.

Repayment of the 2020 Term Loan—On February 5, 2021, we repaid all amounts outstanding under the 2020 Term Loan with borrowings from the 2021 Multicurrency Credit Facility and cash on hand.

2021 Delayed Draw Term Loans—On February 10, 2021, we entered into (i) a 1.1 billion EUR (approximately $1.3 billion at the date of signing) unsecured term loan, the proceeds of which are to be used to fund the Pending Telxius Acquisition, with a maturity date that is 364 days from the date of the first draw thereunder and bears interest at a rate based on our senior unsecured debt rating, which, based on our current debt ratings, is 1.000% above the Euro Interbank Offered Rate (“EURIBOR”) (the “2021 364-Day Delayed Draw Term Loan”) and (ii) an 825.0 million EUR (approximately $1.0 billion at the date of signing) unsecured term loan, the proceeds of which are to be used to fund the Pending Telxius Acquisition, with a maturity date that is three years from the date of the first draw thereunder and that bears interest at a rate based on our senior unsecured debt rating, which, based on our current debt ratings, is 1.125% above EURIBOR (the “2021 Three Year Delayed Draw Term Loan,” and, together with the 2021 364-Day Delayed Draw Term Loan, the “2021 Delayed Draw Term Loans”).

Bridge Facility—In connection with entering into the Pending Telxius Acquisition, we entered into a commitment letter (the “Commitment Letter”), dated January 13, 2021, with Bank of America, N.A. and BofA Securities, Inc. (together, “BofA”) pursuant to which BofA has, with respect to bridge financing, committed to provide up to 7.5 billion EUR (approximately $9.1 billion at the date of signing) in bridge loans (the “Bridge Loan Commitment”) to ensure financing for the Pending Telxius Acquisition. Effective February 10, 2021, the Bridge Loan Commitment was reduced to 4.275 billion EUR (approximately $5.2 billion at the date of signing) as a result of an aggregate of 3.225 billion EUR (approximately $3.9 billion at the date of signing) of additional committed amounts under the 2021 Multicurrency Credit Facility, the 2021 Credit Facility and the 2021 Delayed Draw Term Loans, as described above.

The Commitment Letter contains, and the credit agreement in respect of the Bridge Loan Commitment, if any, will contain, certain customary conditions to funding, including, without limitation, (i) the execution and delivery of definitive financing agreements for the Bridge Loan Commitment and (ii) other customary closing conditions set forth in the Commitment Letter. We will pay certain customary commitment fees and, in the event we make any borrowings in connection with the Bridge Loan Commitment, funding and other fees.

As of March 31, 2021, the key terms under the 2021 Multicurrency Credit Facility, the 2021 Credit Facility, the 2019 Term Loan, the 2021 Delayed Draw Term Loans and the Bridge Loan Commitment were as follows:

Bank Facility		Outstanding Principal Balance ($ in millions)		Maturity Date		LIBOR or EURIBOR borrowing interest rate range (3)	Base rate borrowing interest rate range (3)	Current margin over LIBOR or EURIBOR and the base rate, respectively
2021 Multicurrency Credit Facility	(1)	$	270.0	June 28, 2024	(4)	0.875% - 1.750%	0.000% - 0.750%	1.125% and 0.125%
2021 Credit Facility	(1)	$	2,345.0	January 31, 2026	(4)	0.875% - 1.750%	0.000% - 0.750%	1.125% and 0.125%
2019 Term Loan	(1)	$	1,000.0	January 31, 2025		0.875% - 1.750%	0.000% - 0.750%	1.125% and 0.125%
2021 364-Day Delayed Draw Term Loan	(2)	—		N/A	(5)	0.750% - 1.500%	0.000% - 0.500%	1.000% and 0.000%
2021 Three Year Delayed Draw Term Loan	(2)	—		N/A	(5)	0.875% - 1.625%	0.000% - 0.625%	1.125% and 0.125%
Bridge Loan Commitment	(2) (6)	—		N/A	(6)	0.875% - 1.750%	N/A	1.125% and N/A

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___________

(1)Currently borrowed at the London Interbank Offered Rate (“LIBOR”).

(2)Any amounts borrowed will be borrowed at EURIBOR.

(3)Represents interest rate above LIBOR for LIBOR based borrowings, interest rate above EURIBOR for EURIBOR based borrowings, and the interest rate above the defined base rate for base rate borrowings, in each case based on our debt ratings.

(4)Subject to two optional renewal periods.

(5)The maturity dates for the 2021 364-Day Delayed Draw Term Loan and the 2021 Three Year Delayed Draw Term Loan are 364 days and three years, respectively, from the date of the first borrowing under each facility. As of March 31, 2021, no borrowings were made under these facilities, and as such, no maturity dates have been set. Our ability to borrow thereunder is subject to the occurrence of certain conditions related to the Pending Telxius Acquisition, as set forth in the agreements for the 2021 Delayed Draw Term Loans.

(6)The Bridge Loan Commitment includes subfacilities relating to the various tranches of closings under the Pending Telxius Acquisition. The maturity dates of the subfacilities are 364 days from the first closing date pursuant to such tranche. Each subfacility is subject to a duration fee that applies to the outstanding principal balance beginning 90 days after the related acquisition closing date. As of March 31, 2021, there have been no closings related to the Pending Telxius Acquisition, and as such, no maturity dates have been set and no duration fees apply.

We must pay a quarterly commitment fee on the undrawn portion of each of the 2021 Multicurrency Credit Facility and the 2021 Credit Facility. The commitment fee for the 2021 Multicurrency Credit Facility and the 2021 Credit Facility ranges from 0.080% to 0.300% per annum, based upon our debt ratings, and is currently 0.110%.

The 2021 Multicurrency Credit Facility, the 2021 Credit Facility, the 2019 Term Loan and the 2021 Delayed Draw Term Loans do not require amortization of principal and may be paid prior to maturity in whole or in part at our option without penalty or premium. We have the option of choosing either a defined base rate or LIBOR or EURIBOR as the applicable base rate for borrowings under these bank facilities.

The loan agreements for each of the 2021 Multicurrency Credit Facility, the 2021 Credit Facility, the 2019 Term Loan and the 2021 Delayed Draw Term Loans contain certain reporting, information, financial and operating covenants and other restrictions (including limitations on additional debt, guaranties, sales of assets and liens) with which we must comply. Failure to comply with the financial and operating covenants of the loan agreements could not only prevent us from being able to borrow additional funds under the revolving credit facilities, but may constitute a default, which could result in, among other things, the amounts outstanding, including all accrued interest and unpaid fees, becoming immediately due and payable.

India Credit Facility—During the three months ended March 31, 2021, we entered into a working capital facility in India with a borrowing capacity of INR 1.0 billion (approximately $13.7 million). The working capital facility is subject to annual renewal and bears interest at a rate equal to the one-month India Treasury Bill rate at the time of borrowing plus a spread. As of March 31, 2021, we have not borrowed under this facility.

Stock Repurchase Programs—In March 2011, our Board of Directors approved a stock repurchase program, pursuant to which we are authorized to repurchase up to $1.5 billion of our common stock (the “2011 Buyback”). In December 2017, our Board of Directors approved an additional stock repurchase program, pursuant to which we are authorized to repurchase up to $2.0 billion of our common stock (the “2017 Buyback,” and, together with the 2011 Buyback, the “Buyback Programs”).

During the three months ended March 31, 2021, there were no repurchases under either of the Buyback Programs.

We expect to continue managing the pacing of the remaining approximately $2.0 billion under the Buyback Programs in response to general market conditions and other relevant factors. We expect to fund any further repurchases of our common stock through a combination of cash on hand, cash generated by operations and borrowings under our credit facilities. Repurchases under the Buyback Programs are subject to, among other things, us having available cash to fund the repurchases.

Sales of Equity Securities—We receive proceeds from sales of our equity securities pursuant to our employee stock purchase plan (the “ESPP”) and upon exercise of stock options granted under our equity incentive plan. During the three months ended March 31, 2021, we received an aggregate of $1.9 million in proceeds upon exercises of stock options.

2020 “At the Market” Stock Offering Program—In August 2020, we established an “at the market” stock offering program through which we may issue and sell shares of our common stock having an aggregate gross sales price of up to $1.0 billion (the “2020 ATM Program”). Sales under the 2020 ATM Program may be made by means of ordinary brokers’ transactions on the New York Stock Exchange or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or, subject to our specific instructions, at negotiated prices. We intend to use the net proceeds from any issuances under the 2020 ATM Program for general corporate purposes, which may include, among other things, the funding of acquisitions, additions to working capital and repayment or refinancing of existing indebtedness. As of March 31, 2021, we have not sold any shares of common stock under the 2020 ATM Program.

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Distributions—As a REIT, we must annually distribute to our stockholders an amount equal to at least 90% of our REIT taxable income (determined before the deduction for distributed earnings and excluding any net capital gain). Generally, we have distributed, and expect to continue to distribute, all or substantially all of our REIT taxable income after taking into consideration our utilization of NOLs. We have distributed an aggregate of approximately $10.0 billion to our common stockholders, including the dividend paid in April 2021, primarily classified as ordinary income that may be treated as qualified REIT dividends under Section 199A of the Code for taxable years ending before 2026.

During the three months ended March 31, 2021, we paid $1.21 per share, or $537.6 million, to common stockholders of record. In addition, we declared a distribution of $1.24 per share, or $551.5 million, paid on April 29, 2021 to our common stockholders of record at the close of business on April 13, 2021.

The amount, timing and frequency of future distributions will be at the sole discretion of our Board of Directors and will depend on various factors, a number of which may be beyond our control, including our financial condition and operating cash flows, the amount required to maintain our qualification for taxation as a REIT and reduce any income and excise taxes that we otherwise would be required to pay, limitations on distributions in our existing and future debt and preferred equity instruments, our ability to utilize NOLs to offset our distribution requirements, limitations on our ability to fund distributions using cash generated through our taxable REIT subsidiaries and other factors that our Board of Directors may deem relevant.

We accrue distributions on unvested restricted stock units, which are payable upon vesting. As of March 31, 2021, the amount accrued for distributions payable related to unvested restricted stock units was $7.6 million. During the three months ended March 31, 2021, we paid $7.3 million of distributions upon the vesting of restricted stock units.

Factors Affecting Sources of Liquidity    

As discussed in the “Liquidity and Capital Resources” section of the 2020 Form 10-K, our liquidity depends on our ability to generate cash flow from operating activities, borrow funds under our credit facilities and maintain compliance with the contractual agreements governing our indebtedness. We believe that the debt agreements discussed below represent our material debt agreements that contain covenants, our compliance with which would be material to an investor’s understanding of our financial results and the impact of those results on our liquidity.

Restrictions Under Loan Agreements Relating to Our Credit Facilities—The loan agreements for the 2021 Multicurrency Credit Facility, the 2021 Credit Facility, the 2019 Term Loan and the 2021 Delayed Draw Term Loans contain certain financial and operating covenants and other restrictions applicable to us and our subsidiaries that are not designated as unrestricted subsidiaries on a consolidated basis. These restrictions include limitations on additional debt, distributions and dividends, guaranties, sales of assets and liens. The loan agreements also contain covenants that establish financial tests with which we and our restricted subsidiaries must comply related to total leverage and senior secured leverage, as set forth in the table below. As of March 31, 2021, we were in compliance with each of these covenants.

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		Compliance Tests For The 12 Months Ended March 31, 2021 ($ in billions)
	Ratio (1)	Additional Debt Capacity Under Covenants (2)	Capacity for Adjusted EBITDA Decrease Under Covenants (3)
Consolidated Total Leverage Ratio	Total Debt to Adjusted EBITDA ≤ 6.00:1.00	~ $3.5	~ $0.6
Consolidated Senior Secured Leverage Ratio	Senior Secured Debt to Adjusted EBITDA ≤ 3.00:1.00	~ $13.9 (4)	~ $4.6

_______________

(1)Each component of the ratio as defined in the applicable loan agreement.

(2)Assumes no change to Adjusted EBITDA.

(3)Assumes no change to our debt levels.

(4)Effectively, however, additional Senior Secured Debt under this ratio would be limited to the capacity under the Consolidated Total Leverage Ratio.

Under the terms of the agreements for the 2021 Multicurrency Credit Facility, the 2021 Credit Facility, the 2019 Term Loan and the 2021 Delayed Draw Term Loans, the Pending Telxius Acquisition is designated as a Qualified Acquisition, whereby our Total Debt to Adjusted EBITDA ratio is adjusted to not exceed 7.50 to 1.00 for four fiscal quarters following consummation of the Pending Telxius Acquisition. The loan agreements for our credit facilities also contain reporting and information covenants that require us to provide financial and operating information to the lenders within certain time periods. If we are unable to provide the required information on a timely basis, we would be in breach of these covenants.

Failure to comply with the financial maintenance tests and certain other covenants of the loan agreements for our credit facilities could not only prevent us from being able to borrow additional funds under these credit facilities, but may also constitute a default under these credit facilities, which could result in, among other things, the amounts outstanding, including all accrued interest and unpaid fees, becoming immediately due and payable. If this were to occur, we may not have sufficient cash on hand to repay such indebtedness. The key factors affecting our ability to comply with the debt covenants described above are our financial performance relative to the financial maintenance tests defined in the loan agreements for these credit facilities and our ability to fund our debt service obligations. Based upon our current expectations, we believe our operating results during the next 12 months will be sufficient to comply with these covenants.

Restrictions Under Agreements Relating to the 2015 Securitization and the Trust Securitizations—The indenture and related supplemental indenture governing the American Tower Secured Revenue Notes, Series 2015-2, Class A (the “Series 2015-2 Notes”) issued by GTP Acquisition Partners I, LLC (“GTP Acquisition Partners”) in a private securitization transaction in May 2015 (the “2015 Securitization”) and the loan agreement related to the securitization transactions completed in March 2013 (the “2013 Securitization”) and March 2018 (the “2018 Securitization” and, together with the 2013 Securitization, the “Trust Securitizations”) include certain financial ratios and operating covenants and other restrictions customary for transactions subject to rated securitizations. Among other things, GTP Acquisition Partners and American Tower Asset Sub, LLC and American Tower Asset Sub II, LLC (together, the “AMT Asset Subs”) are prohibited from incurring other indebtedness for borrowed money or further encumbering their assets, subject to customary carve-outs for ordinary course trade payables and permitted encumbrances (as defined in the applicable agreements).

Under the agreements, amounts due will be paid from the cash flows generated by the assets securing the Series 2015-2 Notes or the assets securing the nonrecourse loan that secures the Secured Tower Revenue Securities, Series 2013-2A (the “Series 2013-2A Securities”), Secured Tower Revenue Securities, Series 2018-1, Subclass A (the “Series 2018-1A Securities”), and the Secured Tower Revenue Securities, Series 2018-1, Subclass R (the “Series 2018-1R Securities” and, together with the Series 2018-1A Securities, the “2018 Securities”) issued in the Trust Securitizations (the “Loan”), as applicable, which must be deposited into certain reserve accounts, and thereafter distributed, solely pursuant to the terms of the applicable agreement. On a monthly basis, after payment of all required amounts under the applicable agreement, subject to the conditions described in the table below, the excess cash flows generated from the operation of such assets are released to GTP Acquisition Partners or the AMT Asset Subs, as applicable, which can then be distributed to, and used by, us. As of March 31, 2021, $57.6 million held in such reserve accounts was classified as restricted cash.

Certain information with respect to the 2015 Securitization and the Trust Securitizations is set forth below. The debt service coverage ratio (“DSCR”) is generally calculated as the ratio of the net cash flow (as defined in the applicable agreement) to the amount of interest, servicing fees and trustee fees required to be paid over the succeeding 12 months

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on the principal amount of the Series 2015-2 Notes or the Loan, as applicable, that will be outstanding on the payment date following such date of determination.

	Issuer or Borrower	Notes/Securities Issued	Conditions Limiting Distributions of Excess Cash		Excess Cash Distributed During the Three Months Ended March, 31, 2021	DSCR as of March 31, 2021	Capacity for Decrease in Net Cash Flow Before Triggering Cash Trap DSCR (1)	Capacity for Decrease in Net Cash Flow Before Triggering Minimum DSCR (1)
			Cash Trap DSCR	Amortization Period
					(in millions)		(in millions)	(in millions)
2015 Securitization	GTP Acquisition Partners	American Tower Secured Revenue Notes, Series 2015-2	1.30x, Tested Quarterly (2)	(3)(4)	$74.0	16.70x	$283.4	$286.2
Trust Securitizations	AMT Asset Subs	Secured Tower Revenue Securities, Series 2013-2A, Secured Tower Revenue Securities, Series 2018-1, Subclass A and Secured Tower Revenue Securities, Series 2018-1, Subclass R	1.30x, Tested Quarterly (2)	(3)(5)	$107.6	10.85x	$570.9	$579.8

_______________

(1)Based on the net cash flow of the applicable issuer or borrower as of March 31, 2021 and the expenses payable over the next 12 months on the Series 2015-2 Notes or the Loan, as applicable.

(2)Once triggered, a Cash Trap DSCR condition continues to exist until the DSCR exceeds the Cash Trap DSCR for two consecutive calendar quarters. During a Cash Trap DSCR condition, all cash flow in excess of amounts required to make debt service payments, fund required reserves, pay management fees and budgeted operating expenses and make other payments required under the applicable transaction documents, referred to as excess cash flow, will be deposited into a reserve account (the “Cash Trap Reserve Account”) instead of being released to the applicable issuer or borrower. 

(3)An amortization period commences if the DSCR is equal to or below 1.15x (the “Minimum DSCR”) at the end of any calendar quarter and continues to exist until the DSCR exceeds the Minimum DSCR for two consecutive calendar quarters.

(4)No amortization period is triggered if the outstanding principal amount of a series has not been repaid in full on the applicable anticipated repayment date. However, in such event, additional interest will accrue on the unpaid principal balance of the applicable series, and such series will begin to amortize on a monthly basis from excess cash flow.

(5)An amortization period exists if the outstanding principal amount has not been paid in full on the applicable anticipated repayment date and continues to exist until such principal has been repaid in full.

A failure to meet the noted DSCR tests could prevent GTP Acquisition Partners or the AMT Asset Subs from distributing excess cash flow to us, which could affect our ability to fund our capital expenditures, including tower construction and acquisitions, and to meet REIT distribution requirements. During an “amortization period,” all excess cash flow and any amounts then in the applicable Cash Trap Reserve Account would be applied to pay principal of the Series 2015-2 Notes or the Loan, as applicable, on each monthly payment date, and so would not be available for distribution to us. Further, additional interest will begin to accrue with respect to the Series 2015-2 Notes or subclass of the Loan from and after the anticipated repayment date at a per annum rate determined in accordance with the applicable agreement. With respect to the Series 2015-2 Notes, upon the occurrence of, and during, an event of default, the applicable trustee may, in its discretion or at the direction of holders of more than 50% of the aggregate outstanding principal of the Series 2015-2 Notes, declare the Series 2015-2 Notes immediately due and payable, in which case any excess cash flow would need to be used to pay holders of such notes. Furthermore, if GTP Acquisition Partners or the AMT Asset Subs were to default on the Series 2015-2 Notes or the Loan, the applicable trustee may seek to foreclose upon or otherwise convert the ownership of all or any portion of the 3,537 communications sites that secure the Series 2015-2 Notes or the 5,113 broadcast and wireless communications towers and related assets that secure the Loan, respectively, in which case we could lose such sites and the revenue associated with those assets.

As discussed above, we use our available liquidity and seek new sources of liquidity to fund capital expenditures, future growth and expansion initiatives, satisfy our distribution requirements and repay or repurchase our debt. If we determine that it is desirable or necessary to raise additional capital, we may be unable to do so, or such additional financing may be prohibitively expensive or restricted by the terms of our outstanding indebtedness. Additionally, as further discussed under the caption “Risk Factors” in Item 1A of the 2020 Form 10-K, extreme market volatility and disruption caused by the COVID-19 pandemic may impact our ability to raise additional capital through debt financing activities or our ability to repay or refinance maturing liabilities, or impact the terms of any new obligations. If we are unable to raise capital

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when our needs arise, we may not be able to fund capital expenditures, future growth and expansion initiatives, satisfy our REIT distribution requirements and debt service obligations, or refinance our existing indebtedness.

In addition, our liquidity depends on our ability to generate cash flow from operating activities. As set forth under the caption “Risk Factors” in Item 1A of the 2020 Form 10-K, we derive a substantial portion of our revenues from a small number of tenants and, consequently, a failure by a significant tenant to perform its contractual obligations to us could adversely affect our cash flow and liquidity.

For more information regarding the terms of our outstanding indebtedness, please see note 9 to our consolidated financial statements included in the 2020 Form 10-K.

Critical Accounting Policies and Estimates

Management’s discussion and analysis of financial condition and results of operations are based upon our consolidated and condensed consolidated financial statements, which have been prepared in accordance with GAAP. The preparation of these financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, as well as related disclosures of contingent assets and liabilities. We evaluate our policies and estimates on an ongoing basis, including those related to impairment of long-lived assets, asset retirement obligations, revenue recognition, rent expense, income taxes and accounting for business combinations and acquisitions of assets, which we discussed in the 2020 Form 10-K. Management bases its estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying amounts of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

We have reviewed our policies and estimates to determine our critical accounting policies for the three months ended March 31, 2021. We have made no material changes to the critical accounting policies described in the 2020 Form 10-K.

In October 2019, the Indian Supreme Court issued a ruling regarding the definition of AGR and associated fees and charges, which was reaffirmed in March 2020, that may have a material financial impact on certain of our tenants which could affect their ability to perform their obligations under agreements with us. In September 2020, the Indian Supreme Court defined the expected timeline of ten years for payments owed under the ruling. We will continue to monitor the status of these developments, as it is possible that the estimated future cash flows may differ from current estimates and changes in estimated cash flows from tenants in India could have an impact on previously recorded tangible and intangible assets, including amounts originally recorded as tenant-related intangibles. The carrying value of tenant-related intangibles in India was $1.0 billion as of March 31, 2021, which represents 10% of our consolidated balance of $9.8 billion. Additionally, a significant reduction in tenant related cash flows in India could also impact our tower portfolio and network location intangibles. The carrying values of our tower portfolio and network location intangibles in India were $1.0 billion and $403.4 million, respectively, as of March 31, 2021, which represent 13% and 11% of our consolidated balances of $7.9 billion and $3.6 billion, respectively.

During the three months ended March 31, 2021, no potential goodwill impairment was identified as the fair value of each of our reporting units was in excess of its carrying amount.

Accounting Standards Update

For a discussion of recent accounting standards updates, see note 1 to our consolidated and condensed consolidated financial statements included in this Quarterly Report.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Interest Rate Risk

As of March 31, 2021, we have one interest rate swap agreement related to debt in Colombia. This swap has been designated as a cash flow hedge, has a notional amount of $4.0 million, has an interest rate of 5.37% and expires in April 2021. We also have three interest rate swap agreements related to the 2.250% senior unsecured notes due 2022 (the “2.250% Notes”). These swaps have been designated as fair value hedges, have an aggregate notional amount of $600.0 million, have an interest rate of one-month LIBOR plus applicable spreads and expire in January 2022. In addition, we have three interest rate swap agreements related to a portion of the 3.000% senior unsecured notes due 2023 (the “3.000% Notes”). These swaps have been designated as fair value hedges, have an aggregate notional amount of $500.0 million and an interest rate of one-month LIBOR plus applicable spreads and expire in June 2023.

Changes in interest rates can cause interest charges to fluctuate on our variable rate debt. Variable rate debt as of March 31, 2021 consisted of $270.0 million under the 2021 Multicurrency Credit Facility, $1.0 billion under the 2019 Term Loan, $2.3 billion under the 2021 Credit Facility, $600.0 million under the interest rate swap agreements related to the 2.250% Notes, $500.0 million under the interest rate swap agreements related to the 3.000% Notes and $1.4 million under the Colombian credit facility after giving effect to our interest rate swap agreements. A 10% increase in current interest rates would result in an additional $1.4 million of interest expense for the three months ended March 31, 2021.

Foreign Currency Risk

We are exposed to market risk from changes in foreign currency exchange rates primarily in connection with our foreign subsidiaries and joint ventures internationally. Any transaction denominated in a currency other than the U.S. Dollar is reported in U.S. Dollars at the applicable exchange rate. All assets and liabilities are translated into U.S. Dollars at exchange rates in effect at the end of the applicable fiscal reporting period and all revenues and expenses are translated at average rates for the period. The cumulative translation effect is included in equity as a component of Accumulated other comprehensive loss. We may enter into additional foreign currency financial instruments in anticipation of future transactions to minimize the impact of foreign currency exchange rate fluctuations. For the three months ended March 31, 2021, 41% of our revenues and 49% of our total operating expenses were denominated in foreign currencies.

As of March 31, 2021, we have incurred intercompany debt that is not considered to be permanently reinvested and similar unaffiliated balances that were denominated in a currency other than the functional currency of the subsidiary in which it is recorded. As this debt had not been designated as being a long-term investment in nature, any changes in the foreign currency exchange rates will result in unrealized gains or losses, which will be included in our determination of net income. An adverse change of 10% in the underlying exchange rates of our unsettled intercompany debt and similar unaffiliated balances would result in $71.1 million of unrealized losses that would be included in Other expense in our consolidated statements of operations for the three months ended March 31, 2021.

ITEM 4. CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

We have established disclosure controls and procedures designed to ensure that material information relating to us, including our consolidated subsidiaries, is made known to the officers who certify our financial reports and to other members of senior management and the Board of Directors.

Our management, with the participation of our principal executive officer and principal financial officer, evaluated the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), as of the end of the period covered by this Quarterly Report. Based on this evaluation, our principal executive officer and principal financial officer concluded that these disclosure controls and procedures were effective as of March 31, 2021 and designed to ensure that the information required to be disclosed in our reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported within the requisite time periods specified in the applicable rules and forms, and that it is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There have been no changes in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) during the fiscal quarter ended March 31, 2021 that have materially affected, or are reasonably likely to

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materially affect, our internal control over financial reporting. As permitted by the rules and regulations of the Securities and Exchange Commission, we excluded from our assessment the internal control over financial reporting at InSite which we acquired on December 23, 2020, for the year ended December 31, 2020. We consider InSite material to our results of operations, financial position and cash flows, and we are in the process of integrating the internal control procedures of InSite into our internal control structure.

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PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

We periodically become involved in various claims and lawsuits that are incidental to our business. In the opinion of management, after consultation with counsel, there are no matters currently pending that would, in the event of an adverse outcome, have a material impact on our consolidated financial position, results of operations or liquidity.

ITEM 1A. RISK FACTORS

There were no material changes to the risk factors disclosed in Item 1A of the 2020 Form 10-K.

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ITEM 6. EXHIBITS

		Incorporated By Reference
Exhibit No.	Description of Document	Form	File No.	Date of Filing	Exhibit No.
3.1	Restated Certificate of Incorporation of the Company as filed with the Secretary of State of the State of Delaware, effective as of December 31, 2011	8-K	001-14195	January 3, 2012	3.1
3.2	Certificate of Merger, effective as of December 31, 2011	8-K	001-14195	January 3, 2012	3.2
3.3	Amended and Restated By-Laws of the Company, effective as of February 12, 2016	8-K	001-14195	February 16, 2016	3.1
4.1	Supplemental Indenture No. 8, dated as of March 29, 2021, by and between American Tower Corporation and U.S. Bank National Association, as Trustee, for the 1.600% Senior Notes due 2026 and the 2.700% Senior Notes due 2031	8-K	001-14195	March 29, 2021	4.1
10.1	Second Amended and Restated Multicurrency Revolving Credit Agreement, dated as of February 10, 2021, among the Company and certain of its subsidiaries, as Borrower, Toronto Dominion (Texas) LLC, as Administrative Agent and Swingline Lender, BofA Securities, Inc., TD Securities (USA) LLC, Mizuho Bank, Ltd., Barclays Bank PLC, Citibank, N.A., JPMorgan Chase Bank, N.A., RBC Capital Markets and Morgan Stanley MUFG Loan Partners, LLC, as Joint Lead Arrangers and Joint Bookrunners, Mizuho Bank, Ltd., as Syndication Agent, and BofA Securities, Inc., Barclays Bank PLC, Citibank, N.A, JPMorgan Chase Bank, N.A., Royal Bank of Canada and Morgan Stanley MUFG Loan Partners, LLC, as Co-Documentation Agents	10-K	001-14195	February 25, 2021	10.29
10.2	Third Amended and Restated Revolving Credit Agreement, dated as of February 10, 2021, among the Company, as Borrower, Toronto Dominion (Texas) LLC, as Administrative Agent and Swingline Lender, BofA Securities, Inc., TD Securities (USA) LLC, Mizuho Bank, Ltd., Barclays Bank PLC, Citibank, N.A., JPMorgan Chase Bank, N.A., RBC Capital Markets and Morgan Stanley MUFG Loan Partners, LLC, as Joint Lead Arrangers and Joint Bookrunners, Mizuho Bank, Ltd., as Syndication Agent, and BofA Securities, Inc., Barclays Bank PLC, Citibank, N.A, JPMorgan Chase Bank, N.A., Royal Bank of Canada and Morgan Stanley MUFG Loan Partners, LLC, as Co-Documentation Agents	10-K	001-14195	February 25, 2021	10.30
10.3	First Amendment to Term Loan Agreement, dated as of February 10, 2021, among the Company, as Borrower, Mizuho Bank, Ltd., as Administrative Agent, and certain other lenders under the Company’s Amended and Restated Term Loan Agreement, dated as of December 20, 2019	10-K	001-14195	February 25, 2021	10.32
10.4	Agreement For the Sale and Purchase of the Towers Europe Division of Telxius Telecom, S.A., dated as of January 13, 2021, between Telxius Telecom, S.A. and American Tower International, Inc.	10-K	001-14195	February 25, 2021	10.41

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		Incorporated By Reference
Exhibit No.	Description of Document	Form	File No.	Date of Filing	Exhibit No.
10.5	Agreement For the Sale and Purchase of the Towers LatAm Division of Telxius Telecom, S.A., dated as of January 13, 2021, between Telxius Telecom, S.A. and American Tower International, Inc.	10-K	001-14195	February 25, 2021	10.42
10.6	Commitment Letter, dated as of January 13, 2021, among the Company, Bank of America, N.A. and BofA Securities, Inc.	10-K	001-14195	February 25, 2021	10.43
10.7	364-Day Term Loan Agreement, dated as of February 10, 2021, among the Company, as Borrower, Bank of America, N.A., as Administrative Agent, TD Securities (USA), LLC and Mizuho Bank, Ltd. as Syndication Agents, BofA Securities, Inc., TD Securities (USA), LLC, Mizuho Bank, Ltd., Barclays Bank PLC, Citibank, N.A., JPMorgan Chase Bank, N.A., RBC Capital Markets and Morgan Stanley MUFG Loan Partners, LLC as Joint Lead Arrangers and Joint Bookrunners, and Barclays Bank PLC, Citibank, N.A., JPMorgan Chase Bank, N.A., Royal Bank of Canada and Morgan Stanley MUFG Loan Partners, LLC, as Co-Documentation Agents	10-K	001-14195	February 25, 2021	10.44
10.8	3-Year Term Loan Agreement, dated as of February 10, 2021, among the Company, as Borrower, Bank of America, N.A., as Administrative Agent, TD Securities (USA), LLC and Mizuho Bank, Ltd. as Syndication Agents, BofA Securities, Inc., TD Securities (USA), LLC, Mizuho Bank, Ltd., Barclays Bank PLC, Citibank, N.A., JPMorgan Chase Bank, N.A., RBC Capital Markets and Morgan Stanley MUFG Loan Partners, LLC as Joint Lead Arrangers and Joint Bookrunners, and Barclays Bank PLC, Citibank, N.A., JPMorgan Chase Bank, N.A., Royal Bank of Canada and Morgan Stanley MUFG Loan Partners, LLC, as Co-Documentation Agents	10-K	001-14195	February 25, 2021	10.45
31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002	Filed herewith as Exhibit 31.1	—	—	—
31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002	Filed herewith as Exhibit 31.2	—	—	—
32	Certifications filed pursuant to 18. U.S.C. Section 1350	Filed herewith as Exhibit 32	—	—	—

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		Incorporated By Reference
Exhibit No.	Description of Document	Form	File No.	Date of Filing	Exhibit No.
101.SCH	Inline XBRL Taxonomy Extension Schema Document	Filed herewith as Exhibit 101	—	—	—
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF	Inline XBRL Taxonomy Extension Definition
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)	—	—	—	—

54

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	AMERICAN TOWER CORPORATION
Date: April 29, 2021	By:	/S/   RODNEY M. SMITH
		Rodney M. Smith Executive Vice President, Chief Financial Officer and Treasurer (Duly Authorized Officer and Principal Financial Officer)

55

EX-31.1

Exhibit 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER PURSUANT TO SECTION 302 OF THE

SARBANES-OXLEY ACT OF 2002

I, Thomas A. Bartlett, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of American Tower Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: April 29, 2021	By:	/S/    THOMAS A. BARTLETT
		Thomas A. Bartlett
		President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Rodney M. Smith, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of American Tower Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: April 29, 2021	By:	/S/    RODNEY M.SMITH
		Rodney M. Smith
		Executive Vice President, Chief Financial Officer and Treasurer

EX-32

Exhibit 32

CERTIFICATIONS PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this Quarterly Report on Form 10-Q of American Tower Corporation (the “Company”) for the three months ended March 31, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned officers of the Company hereby certifies, pursuant to 18 U.S.C. Section 1350, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: April 29, 2021	By:	/S/   THOMAS A. BARTLETT
		Thomas A. Bartlett
		President and Chief Executive Officer
Date: April 29, 2021	By:	/S/    RODNEY M. SMITH
		Rodney M. Smith
		Executive Vice President, Chief Financial Officer and Treasurer

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

COVER - shares	3 Months Ended
	Mar. 31, 2021	Apr. 22, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-14195
Entity Registrant Name	AMERICAN TOWER CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	65-0723837
Entity Address, Address Line One	116 Huntington Avenue
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02116
City Area Code	617
Local Phone Number	375-7500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		444,797,395
Entity Central Index Key	0001053507
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
Common Stock, $0.01 par value
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	AMT
Security Exchange Name	NYSE
1.375% Senior Notes due 2025
Document Information [Line Items]
Title of 12(b) Security	1.375% Senior Notes due 2025
Trading Symbol	AMT 25A
Security Exchange Name	NYSE
1.950% Senior Notes due 2026
Document Information [Line Items]
Title of 12(b) Security	1.950% Senior Notes due 2026
Trading Symbol	AMT 26B
Security Exchange Name	NYSE
0.500% Notes
Document Information [Line Items]
Title of 12(b) Security	0.500% Senior Notes due 2028
Trading Symbol	AMT 28A
Security Exchange Name	NYSE
1.000% Notes
Document Information [Line Items]
Title of 12(b) Security	1.000% Senior Notes due 2032
Trading Symbol	AMT 32
Security Exchange Name	NYSE

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 1,913.6	$ 1,746.3
Restricted cash	79.7	115.1
Accounts receivable, net	537.7	511.6
Prepaid and other current assets	490.6	532.6
Total current assets	3,021.6	2,905.6
PROPERTY AND EQUIPMENT, net	12,712.5	12,808.7
GOODWILL	7,262.4	7,282.7
OTHER INTANGIBLE ASSETS, net	13,507.3	13,839.8
DEFERRED TAX ASSET	127.3	123.1
DEFERRED RENT ASSET	2,197.4	2,084.3
RIGHT-OF-USE ASSET	7,719.9	7,789.2
NOTES RECEIVABLE AND OTHER NON-CURRENT ASSETS	394.1	400.1
TOTAL	46,942.5	47,233.5
CURRENT LIABILITIES:
Accounts payable	130.1	139.1
Accrued expenses	944.8	1,043.7
Distributions payable	555.8	544.6
Accrued interest	167.1	207.8
Current portion of operating lease liability	555.8	539.9
Current portion of long-term obligations	1,336.5	789.8
Unearned revenue	506.5	390.6
Total current liabilities	4,196.6	3,655.5
LONG-TERM OBLIGATIONS	27,990.3	28,497.7
OPERATING LEASE LIABILITY	6,812.9	6,884.4
ASSET RETIREMENT OBLIGATIONS	1,574.6	1,571.3
DEFERRED TAX LIABILITY	854.7	859.5
OTHER NON-CURRENT LIABILITIES	961.6	984.6
Total liabilities	42,390.7	42,453.0
COMMITMENTS AND CONTINGENCIES
REDEEMABLE NONCONTROLLING INTERESTS	212.9	212.1
EQUITY (shares in thousands):
Common stock: $.01 par value; 1,000,000 shares authorized; 455,708 and 455,245 shares issued; and 444,793 and 444,330 shares outstanding, respectively	4.6	4.6
Additional paid-in capital	10,474.6	10,473.7
Distributions in excess of earnings	(1,251.8)	(1,343.0)
Accumulated other comprehensive loss	(4,061.6)	(3,759.4)
Treasury stock (10,915 shares at cost)	(1,282.4)	(1,282.4)
Total American Tower Corporation equity	3,883.4	4,093.5
Noncontrolling interests	455.5	474.9
Total equity	4,338.9	4,568.4
TOTAL	$ 46,942.5	$ 47,233.5

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	455,708,000	455,245,000
Common stock, shares outstanding (in shares)	444,793,000	444,330,000
Treasury stock, shares (in shares)	10,915,000	10,915,000

XML

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
REVENUES:
Total operating revenues	$ 2,158.5	$ 1,993.1
Costs of operations (exclusive of items shown separately below):
Property	563.3	544.1
Depreciation, amortization and accretion	522.5	472.3
Selling, general, administrative and development expense	182.6	217.8
Other operating expenses	50.4	14.2
Total operating expenses	1,329.8	1,256.3
OPERATING INCOME	828.7	736.8
OTHER INCOME (EXPENSE):
Interest expense	(207.0)	(208.8)
Loss on retirement of long-term obligations	(25.7)	(34.6)
Other income (expense) (including foreign currency gains (losses) of $94.7 and $(65.5), respectively)	95.2	(63.8)
Total other expense	(126.1)	(297.1)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	702.6	439.7
Income tax provision	(50.3)	(21.1)
NET INCOME	652.3	418.6
Net income attributable to noncontrolling interests	(7.3)	(3.6)
NET INCOME ATTRIBUTABLE TO AMERICAN TOWER CORPORATION COMMON STOCKHOLDERS	$ 645.0	$ 415.0
NET INCOME PER COMMON SHARE AMOUNTS:
Basic net income attributable to American Tower Corporation common stockholders (in dollars per share)	$ 1.45	$ 0.94
Diluted net income attributable to American Tower Corporation common stockholders (in dollars per share)	$ 1.45	$ 0.93
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING (in thousands):
BASIC (in shares)	444,486	443,055
DILUTED (in shares)	446,294	445,832
Interest income	$ 11.4	$ 10.1
Property
REVENUES:
Total operating revenues	2,129.7	1,973.2
Services
REVENUES:
Total operating revenues	28.8	19.9
Costs of operations (exclusive of items shown separately below):
Services	$ 11.0	$ 7.9

XML

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Foreign currency (losses) gains	$ 94.7	$ (65.5)

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 652.3	$ 418.6
Other comprehensive income (loss):
Changes in fair value of cash flow hedges, each net of tax expense of $0	(0.0)	(0.0)
Reclassification of unrealized losses on cash flow hedges to net income, each net of tax expense of $0	0.0	0.0
Foreign currency translation adjustments, each net of tax benefit of $(0.0)	(323.7)	(1,343.5)
Other comprehensive loss	(323.7)	(1,343.5)
Comprehensive income (loss)	328.6	(924.9)
Allocation of accumulated other comprehensive income (loss) resulting from purchases of redeemable noncontrolling interests	0.1	(142.2)
Comprehensive loss attributable to noncontrolling interests	14.1	34.0
Comprehensive income (loss) attributable to American Tower Corporation stockholders	$ 342.8	$ (1,033.1)

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Changes in fair value of cash flow hedges, tax	$ 0.0	$ 0.0
Reclassification of unrealized gains on cash flow hedges to net income, tax	0.0	0.0
Foreign currency translation adjustments, tax expense (benefit)	$ (0.0)	$ (0.0)

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 652.3	$ 418.6
Adjustments to reconcile net income to cash provided by operating activities
Depreciation, amortization and accretion	522.5	472.3
Stock-based compensation expense	38.0	47.7
Loss on early retirement of long-term obligations	25.7	34.6
Other non-cash items reflected in statements of operations	(87.5)	81.6
Increase in net deferred rent balances	(119.9)	(56.2)
Right-of-use asset and Operating lease liability, net	4.1	1.0
Decrease (increase) in assets	18.1	(210.8)
Increase in liabilities	39.4	11.2
Cash provided by operating activities	1,092.7	800.0
Payments to acquire towers	324.8	214.4
CASH FLOWS FROM INVESTING ACTIVITIES
Payments for acquisitions, net of cash acquired	(114.8)	(49.3)
Proceeds from sale of short-term investments and other non-current assets	4.4	5.8
Deposits and other	(3.5)	4.5
Cash used for investing activities	(438.7)	(253.4)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings under credit facilities	1,870.0	2,642.3
Proceeds from issuance of senior notes, net	1,398.1	1,496.0
Proceeds from term loan	0.0	750.0
Repayments of notes payable, credit facilities, senior notes, secured debt, term loan and finance leases	(3,071.3)	(4,351.2)
Distributions to noncontrolling interest holders, net	(8.1)	(13.5)
Purchases of common stock	0.0	(39.7)
Proceeds from stock options	1.9	11.1
Distributions paid on common stock	(544.9)	(454.9)
Payment for early retirement of long-term obligations	(61.9)	(33.5)
Deferred financing costs and other financing activities	(61.3)	(88.2)
Purchase of redeemable noncontrolling interest	(2.5)	(524.4)
Cash used for financing activities	(480.0)	(606.0)
Net effect of changes in foreign currency exchange rates on cash and cash equivalents, and restricted cash	(42.1)	(118.3)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH	131.9	(177.7)
CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF PERIOD	1,861.4	1,578.0
CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD	1,993.3	1,400.3
CASH PAID FOR INCOME TAXES (NET OF REFUNDS OF $24.8 AND $0.1, RESPECTIVELY)	5.8	35.1
CASH PAID FOR INTEREST	239.1	262.0
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Purchases of property and equipment under finance leases and perpetual easements	10.5	13.1
Decrease in accounts payable and accrued expenses for purchases of property and equipment and construction activities	(34.4)	(15.0)
Settlement of third-party debt	$ 0.0	$ (5.0)

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Cash Flows [Abstract]
Income tax refunds	$ 24.8	$ 0.1

XML

CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Distributions in Excess of Earnings	Noncontrolling Interests
BEGINNING BALANCE (shares) at Dec. 31, 2019		453,541	10,651
BEGINNING BALANCE at Dec. 31, 2019	$ 5,490.4	$ 4.5	$ (1,226.4)	$ 10,117.7	$ (2,823.6)	$ (1,016.8)	$ 435.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation related activity (shares)		655
Stock-based compensation related activity	(4.3)	$ 0.0		(4.3)
Treasury stock activity (shares)			(213)
Treasury stock activity	(45.1)		$ (45.1)
Changes in fair value of cash flow hedges, net of tax	(0.0)				(0.0)
Reclassification of unrealized losses on cash flow hedges to net income, net of tax	0.0				0.0
Foreign currency translation adjustment, net of tax	(1,311.4)				(1,305.9)		(5.5)
Distributions to noncontrolling interest	(1.5)						(1.5)
Common stock distributions declared	(480.7)					(480.7)
Net income	417.2					415.0	2.2
ENDING BALANCE (shares) at Mar. 31, 2020		454,196	10,864
ENDING BALANCE at Mar. 31, 2020	4,064.6	$ 4.5	$ (1,271.5)	10,255.6	(4,271.7)	(1,082.5)	430.2
BEGINNING BALANCE (shares) at Dec. 31, 2020		455,245	10,915
BEGINNING BALANCE at Dec. 31, 2020	4,568.4	$ 4.6	$ (1,282.4)	10,473.7	(3,759.4)	(1,343.0)	474.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation related activity (shares)		437
Stock-based compensation related activity	(0.7)	$ 0.0		(0.7)
Changes in fair value of cash flow hedges, net of tax	(0.0)				(0.0)
Reclassification of unrealized losses on cash flow hedges to net income, net of tax	0.0				0.0
Foreign currency translation adjustment, net of tax	(323.5)				(302.3)		(21.2)
Distributions to noncontrolling interest	(0.3)						(0.3)
Redemption of noncontrolling interest (shares)		26
Redemption of noncontrolling interest		$ 0.0		1.7			(1.7)
Purchase of redeemable noncontrolling interest	0.0			(0.1)	0.1
Common stock distributions declared	(553.8)					(553.8)
Net income	648.8					645.0	3.8
ENDING BALANCE (shares) at Mar. 31, 2021		455,708	10,915
ENDING BALANCE at Mar. 31, 2021	$ 4,338.9	$ 4.6	$ (1,282.4)	$ 10,474.6	$ (4,061.6)	$ (1,251.8)	$ 455.5

XML

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

The accompanying consolidated and condensed consolidated financial statements have been prepared by American Tower Corporation (together with its subsidiaries, “ATC” or the “Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). The financial information included herein is unaudited. However, the Company believes that all adjustments, which are of a normal and recurring nature, considered necessary for a fair presentation of its financial position and results of operations for such periods have been included herein. The consolidated and condensed consolidated financial statements and related notes should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (the “2020 Form 10-K”). The results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results that may be expected for the entire year.

Principles of Consolidation and Basis of Presentation—The accompanying consolidated and condensed consolidated financial statements include the accounts of the Company and those entities in which it has a controlling interest. Investments in entities that the Company does not control are accounted for using the equity method or as investments in equity securities, depending upon the Company’s ability to exercise significant influence over operating and financial policies. All intercompany accounts and transactions have been eliminated. As of March 31, 2021, the Company holds (i) a 51% controlling interest in ATC Europe B.V. (“ATC Europe”), a joint venture that primarily consists of the Company’s operations in France, Germany and Poland (PGGM holds a 49% noncontrolling interest) and (ii) a 92% controlling interest in ATC Telecom Infrastructure Private Limited (“ATC TIPL”), formerly Viom Networks Limited (“Viom”), in India.

Reportable Segments— During the fourth quarter of 2020, as a result of the Company’s acquisition of InSite Wireless Group, LLC (“InSite,” and the acquisition, the “InSite Acquisition”), the Company updated its reportable segments to rename U.S. property and Asia property to U.S. & Canada property and Asia-Pacific property, respectively. The Company continues to report its results in six segments – U.S. & Canada property, Asia-Pacific property, Africa property, Europe property, Latin America property and services, which are discussed further in note 15. The change in reportable segment names is solely reflective of the inclusion of Canada and Australia in the Company’s business operations, as a result of the InSite Acquisition, and had no impact on the Company’s consolidated financial statements or historical segment financial information for any prior periods.

Significant Accounting Policies—The Company’s significant accounting policies are described in note 1 to the Company’s consolidated financial statements included in the 2020 Form 10-K. There have been no material changes to the Company’s significant accounting policies during the three months ended March 31, 2021.

Cash and Cash Equivalents and Restricted Cash—The reconciliation of cash and cash equivalents and restricted cash reported within the applicable balance sheet that sum to the total of the same such amounts shown in the statement of cash flows is as follows:

	Three Months Ended March 31,
	2021		2020
Cash and cash equivalents	$	1,913.6	$	1,326.0
Restricted cash	79.7		74.3
Total cash, cash equivalents and restricted cash	$	1,993.3	$	1,400.3

Revenue—The Company’s revenue is derived from leasing the right to use its communications sites and the land on which the sites are located (the “lease component”) and from the reimbursement of costs incurred by the Company in operating the communications sites and supporting the tenants’ equipment as well as other services and contractual rights (the “non-lease component”). Most of the Company’s revenue is derived from leasing arrangements and is accounted for as lease revenue unless the timing and pattern of revenue recognition of the non-lease component differs from the lease component. If the timing and pattern of the non-lease component revenue recognition differs from that of the lease component, the Company separately determines the stand-alone selling prices and pattern of revenue recognition for each performance obligation. Revenue related to distributed antenna system (“DAS”) networks and fiber and other related assets results from agreements with tenants that are not leases.

Non-lease revenue—Non-lease revenue consists primarily of revenue generated from DAS networks, fiber and other property related revenue. DAS networks and fiber arrangements require that the Company provide the tenant the right to use the applicable communications infrastructure. Performance obligations are satisfied over time for the duration of the arrangements. Other property related revenue streams, which include site inspections, are not material on either an individual or consolidated basis. There were no material changes in the receivables, contract assets and contract liabilities from contracts with tenants for the three months ended March 31, 2021.

Services revenue—The Company offers tower-related services in the United States. These services include site application, zoning and permitting (“AZP”) and structural analysis. There is a single performance obligation related to AZP and revenue is recognized over time based on milestones achieved, which are determined based on costs expected to be incurred. Structural analysis services may have more than one performance obligation, contingent upon the number of contracted services. Revenue is recognized at the point in time the services are completed.

A summary of revenue disaggregated by source and geography is as follows:

Three Months Ended March 31, 2021	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America		Total
Non-lease property revenue	$	71.6	$	2.5	$	4.9	$	2.2	$	31.9	$	113.1
Services revenue	28.8		—		—		—		—		28.8
Total non-lease revenue	$	100.4	$	2.5	$	4.9	$	2.2	$	31.9	$	141.9
Property lease revenue	1,159.7		278.9		230.8		42.4		304.8		2,016.6
Total revenue	$	1,260.1	$	281.4	$	235.7	$	44.6	$	336.7	$	2,158.5

Three Months Ended March 31, 2020	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America		Total
Non-lease property revenue	$	58.6	$	2.2	$	2.9	$	1.5	$	32.9	$	98.1
Services revenue	19.9		—		—		—		—		19.9
Total non-lease revenue	$	78.5	$	2.2	$	2.9	$	1.5	$	32.9	$	118.0
Property lease revenue	1,031.3		284.4		222.6		33.0		303.8		1,875.1
Total revenue	$	1,109.8	$	286.6	$	225.5	$	34.5	$	336.7	$	1,993.1

Accounting Standards Updates

In March 2020, the Financial Accounting Standards Board (the “FASB”) issued guidance to provide optional expedients and exceptions for applying accounting principles generally accepted in the United States to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The guidance applies only to contracts, hedging relationships and other transactions that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by the guidance do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022 for which an entity has elected certain optional expedients that are retained through the end of the hedging relationship. In January 2021, the FASB issued additional guidance that clarifies that certain practical expedients and exceptions for contract modifications and hedge accounting apply to derivatives that are affected by reference rate reform. As of March 31, 2021, the Company has not modified any contracts as a result of reference rate reform and is evaluating the impact this standard may have on its financial statements.

XML

PREPAID AND OTHER CURRENT ASSETS

3 Months Ended

Mar. 31, 2021

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

PREPAID AND OTHER CURRENT ASSETS

PREPAID AND OTHER CURRENT ASSETS

Prepaid and other current assets consisted of the following:

	As of
	March 31, 2021		December 31, 2020
Prepaid assets	$	76.2	$	66.1
Prepaid income tax	100.3		143.7
Unbilled receivables	160.8		176.9
Value added tax and other consumption tax receivables	58.1		66.3
Other miscellaneous current assets	95.2		79.6
Prepaid and other current assets	$	490.6	$	532.6

XML

LEASES

3 Months Ended

Mar. 31, 2021

Leases [Abstract]

LEASES

LEASES

The Company determines if an arrangement is a lease at the inception of the agreement. The Company considers an arrangement to be a lease if it conveys the right to control the use of the communications site or ground space underneath a communications site for a period of time in exchange for consideration. The Company is both a lessor and a lessee.

During the three months ended March 31, 2021, the Company made no changes to the methods described in note 4 to its consolidated financial statements included in the 2020 Form 10-K. As of March 31, 2021, the Company does not have any material related party leases as either a lessor or a lessee. To the extent there are any intercompany leases, these are eliminated in consolidation.

Lessor— Historically, the Company has been able to successfully renew its ground leases as needed to ensure continuation of its tower revenue. Accordingly, the Company assumes that it will have access to the land underneath its tower sites when calculating future minimum rental receipts. Future minimum rental receipts expected under non-cancellable operating lease agreements as of March 31, 2021 were as follows:

Fiscal Year	Amount (1)
Remainder of 2021	$	4,632.2
2022	5,976.8
2023	5,866.5
2024	5,755.9
2025	5,330.3
Thereafter	32,576.0
Total	$	60,137.7

_______________

(1)Balances are translated at the applicable period-end exchange rate, which may impact comparability between periods.    

Lessee—The Company assesses its right-of-use asset and other lease-related assets for impairment, as described in note 1 to the Company’s consolidated financial statements included in the 2020 Form 10-K. There were no material impairments recorded related to these assets during the three months ended March 31, 2021 and 2020.

The Company leases certain land and office space under operating leases and land and improvements, towers and vehicles under finance leases. As of March 31, 2021, operating lease assets were included in Right-of-use asset and finance lease assets were included in Property and equipment, net in the consolidated balance sheet. During the three months ended March 31, 2021, there were no material changes in the terms and provisions of the Company’s operating leases in which the Company is a lessee. There were no material changes in finance lease assets and liabilities during the three months ended March 31, 2021.

Information about other lease-related balances is as follows:

	As of
	March 31, 2021		December 31, 2020
Operating leases:
Right-of-use asset	$	7,719.9	$	7,789.2
Current portion of lease liability	$	555.8	$	539.9
Lease liability	6,812.9		6,884.4
Total operating lease liability	$	7,368.7	$	7,424.3

The weighted-average remaining lease terms and incremental borrowing rates are as follows:

	As of
	March 31, 2021		December 31, 2020
Operating leases:
Weighted-average remaining lease term (years)	13.6		13.7
Weighted-average incremental borrowing rate	5.6	%	5.6	%

The following table sets forth the components of lease cost:

	Three Months Ended March 31,
	2021		2020
Operating lease cost	$	251.3	$	250.7
Variable lease costs not included in lease liability (1)	69.3		61.4

_______________

(1)Includes property tax paid on behalf of the landlord.

Supplemental cash flow information is as follows:

	Three Months Ended March 31,
	2021		2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	(244.9)	$	(252.0)
Non-cash items:
New operating leases (1)	$	89.2	$	50.1
Operating lease modifications and reassessments	$	85.7	$	96.9

_______________

(1)Amount includes new operating leases and leases acquired in connection with acquisitions.

As of March 31, 2021, the Company does not have material operating or financing leases that have not yet commenced.

Maturities of operating lease liabilities as of March 31, 2021 were as follows:

Fiscal Year	Operating Lease (1)
Remainder of 2021	$	678.3
2022	874.6
2023	842.7
2024	805.2
2025	759.8
Thereafter	6,497.9
Total lease payments	10,458.5
Less amounts representing interest	(3,089.8)
Total lease liability	7,368.7
Less current portion of lease liability	555.8
Non-current lease liability	$	6,812.9

_______________

(1)Balances are translated at the applicable period-end exchange rate, which may impact comparability between periods.

LEASES

LEASES

The Company determines if an arrangement is a lease at the inception of the agreement. The Company considers an arrangement to be a lease if it conveys the right to control the use of the communications site or ground space underneath a communications site for a period of time in exchange for consideration. The Company is both a lessor and a lessee.

During the three months ended March 31, 2021, the Company made no changes to the methods described in note 4 to its consolidated financial statements included in the 2020 Form 10-K. As of March 31, 2021, the Company does not have any material related party leases as either a lessor or a lessee. To the extent there are any intercompany leases, these are eliminated in consolidation.

Lessor— Historically, the Company has been able to successfully renew its ground leases as needed to ensure continuation of its tower revenue. Accordingly, the Company assumes that it will have access to the land underneath its tower sites when calculating future minimum rental receipts. Future minimum rental receipts expected under non-cancellable operating lease agreements as of March 31, 2021 were as follows:

Fiscal Year	Amount (1)
Remainder of 2021	$	4,632.2
2022	5,976.8
2023	5,866.5
2024	5,755.9
2025	5,330.3
Thereafter	32,576.0
Total	$	60,137.7

_______________

(1)Balances are translated at the applicable period-end exchange rate, which may impact comparability between periods.    

Lessee—The Company assesses its right-of-use asset and other lease-related assets for impairment, as described in note 1 to the Company’s consolidated financial statements included in the 2020 Form 10-K. There were no material impairments recorded related to these assets during the three months ended March 31, 2021 and 2020.

The Company leases certain land and office space under operating leases and land and improvements, towers and vehicles under finance leases. As of March 31, 2021, operating lease assets were included in Right-of-use asset and finance lease assets were included in Property and equipment, net in the consolidated balance sheet. During the three months ended March 31, 2021, there were no material changes in the terms and provisions of the Company’s operating leases in which the Company is a lessee. There were no material changes in finance lease assets and liabilities during the three months ended March 31, 2021.

Information about other lease-related balances is as follows:

	As of
	March 31, 2021		December 31, 2020
Operating leases:
Right-of-use asset	$	7,719.9	$	7,789.2
Current portion of lease liability	$	555.8	$	539.9
Lease liability	6,812.9		6,884.4
Total operating lease liability	$	7,368.7	$	7,424.3

The weighted-average remaining lease terms and incremental borrowing rates are as follows:

	As of
	March 31, 2021		December 31, 2020
Operating leases:
Weighted-average remaining lease term (years)	13.6		13.7
Weighted-average incremental borrowing rate	5.6	%	5.6	%

The following table sets forth the components of lease cost:

	Three Months Ended March 31,
	2021		2020
Operating lease cost	$	251.3	$	250.7
Variable lease costs not included in lease liability (1)	69.3		61.4

_______________

(1)Includes property tax paid on behalf of the landlord.

Supplemental cash flow information is as follows:

	Three Months Ended March 31,
	2021		2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	(244.9)	$	(252.0)
Non-cash items:
New operating leases (1)	$	89.2	$	50.1
Operating lease modifications and reassessments	$	85.7	$	96.9

_______________

(1)Amount includes new operating leases and leases acquired in connection with acquisitions.

As of March 31, 2021, the Company does not have material operating or financing leases that have not yet commenced.

Maturities of operating lease liabilities as of March 31, 2021 were as follows:

Fiscal Year	Operating Lease (1)
Remainder of 2021	$	678.3
2022	874.6
2023	842.7
2024	805.2
2025	759.8
Thereafter	6,497.9
Total lease payments	10,458.5
Less amounts representing interest	(3,089.8)
Total lease liability	7,368.7
Less current portion of lease liability	555.8
Non-current lease liability	$	6,812.9

_______________

(1)Balances are translated at the applicable period-end exchange rate, which may impact comparability between periods.

LEASES

LEASES

The Company determines if an arrangement is a lease at the inception of the agreement. The Company considers an arrangement to be a lease if it conveys the right to control the use of the communications site or ground space underneath a communications site for a period of time in exchange for consideration. The Company is both a lessor and a lessee.

During the three months ended March 31, 2021, the Company made no changes to the methods described in note 4 to its consolidated financial statements included in the 2020 Form 10-K. As of March 31, 2021, the Company does not have any material related party leases as either a lessor or a lessee. To the extent there are any intercompany leases, these are eliminated in consolidation.

Lessor— Historically, the Company has been able to successfully renew its ground leases as needed to ensure continuation of its tower revenue. Accordingly, the Company assumes that it will have access to the land underneath its tower sites when calculating future minimum rental receipts. Future minimum rental receipts expected under non-cancellable operating lease agreements as of March 31, 2021 were as follows:

Fiscal Year	Amount (1)
Remainder of 2021	$	4,632.2
2022	5,976.8
2023	5,866.5
2024	5,755.9
2025	5,330.3
Thereafter	32,576.0
Total	$	60,137.7

_______________

(1)Balances are translated at the applicable period-end exchange rate, which may impact comparability between periods.    

Lessee—The Company assesses its right-of-use asset and other lease-related assets for impairment, as described in note 1 to the Company’s consolidated financial statements included in the 2020 Form 10-K. There were no material impairments recorded related to these assets during the three months ended March 31, 2021 and 2020.

The Company leases certain land and office space under operating leases and land and improvements, towers and vehicles under finance leases. As of March 31, 2021, operating lease assets were included in Right-of-use asset and finance lease assets were included in Property and equipment, net in the consolidated balance sheet. During the three months ended March 31, 2021, there were no material changes in the terms and provisions of the Company’s operating leases in which the Company is a lessee. There were no material changes in finance lease assets and liabilities during the three months ended March 31, 2021.

Information about other lease-related balances is as follows:

	As of
	March 31, 2021		December 31, 2020
Operating leases:
Right-of-use asset	$	7,719.9	$	7,789.2
Current portion of lease liability	$	555.8	$	539.9
Lease liability	6,812.9		6,884.4
Total operating lease liability	$	7,368.7	$	7,424.3

The weighted-average remaining lease terms and incremental borrowing rates are as follows:

	As of
	March 31, 2021		December 31, 2020
Operating leases:
Weighted-average remaining lease term (years)	13.6		13.7
Weighted-average incremental borrowing rate	5.6	%	5.6	%

The following table sets forth the components of lease cost:

	Three Months Ended March 31,
	2021		2020
Operating lease cost	$	251.3	$	250.7
Variable lease costs not included in lease liability (1)	69.3		61.4

_______________

(1)Includes property tax paid on behalf of the landlord.

Supplemental cash flow information is as follows:

	Three Months Ended March 31,
	2021		2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	(244.9)	$	(252.0)
Non-cash items:
New operating leases (1)	$	89.2	$	50.1
Operating lease modifications and reassessments	$	85.7	$	96.9

_______________

(1)Amount includes new operating leases and leases acquired in connection with acquisitions.

As of March 31, 2021, the Company does not have material operating or financing leases that have not yet commenced.

Maturities of operating lease liabilities as of March 31, 2021 were as follows:

Fiscal Year	Operating Lease (1)
Remainder of 2021	$	678.3
2022	874.6
2023	842.7
2024	805.2
2025	759.8
Thereafter	6,497.9
Total lease payments	10,458.5
Less amounts representing interest	(3,089.8)
Total lease liability	7,368.7
Less current portion of lease liability	555.8
Non-current lease liability	$	6,812.9

_______________

(1)Balances are translated at the applicable period-end exchange rate, which may impact comparability between periods.

XML

GOODWILL AND OTHER INTANGIBLE ASSETS

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

GOODWILL AND OTHER INTANGIBLE ASSETS

The changes in the carrying value of goodwill for each of the Company’s business segments were as follows:

	Property										Services		Total
	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America
Balance as of January 1, 2021	$	4,750.8	$	1,016.9	$	625.6	$	279.1	$	608.3	$	2.0	$	7,282.7
Additions and adjustments (1)	21.3		(0.0)		—		—		—		—		21.3
Effect of foreign currency translation	4.2		(0.5)		(3.4)		(11.1)		(30.8)		—		(41.6)
Balance as of March 31, 2021	$	4,776.3	$	1,016.4	$	622.2	$	268.0	$	577.5	$	2.0	$	7,262.4

_______________

(1)Consists of an aggregate of $21.3 million of measurement period adjustments related to the InSite Acquisition.

The Company’s other intangible assets subject to amortization consisted of the following:

		As of March 31, 2021						As of December 31, 2020
	Estimated Useful Lives (years)	Gross Carrying Value		Accumulated Amortization		Net Book Value		Gross Carrying Value		Accumulated Amortization		Net Book Value
Acquired network location intangibles (1)	Up to 20	$	5,751.7	$	(2,171.1)	$	3,580.6	$	5,784.0	$	(2,117.6)	$	3,666.4
Acquired tenant-related intangibles	Up to 20	14,221.7		(4,379.6)		9,842.1		14,322.5		(4,237.5)		10,085.0
Acquired licenses and other intangibles	3-20	94.6		(10.0)		84.6		97.8		(9.4)		88.4
Total other intangible assets		$	20,068.0	$	(6,560.7)	$	13,507.3	$	20,204.3	$	(6,364.5)	$	13,839.8

_______________

(1)Acquired network location intangibles are amortized over the shorter of the term of the corresponding ground lease, taking into consideration lease renewal options and residual value, generally up to 20 years, as the Company considers these intangibles to be directly related to the tower assets.

The acquired network location intangibles represent the value to the Company of the incremental revenue growth that could potentially be obtained from leasing the excess capacity on acquired communications sites. The acquired tenant-

related intangibles typically represent the value to the Company of tenant contracts and relationships in place at the time of an acquisition or similar transaction, including assumptions regarding estimated renewals.

The Company amortizes its acquired network location intangibles and tenant-related intangibles on a straight-line basis over their estimated useful lives. As of March 31, 2021, the remaining weighted average amortization period of the Company’s intangible assets was 15 years. Amortization of intangible assets for the three months ended March 31, 2021 and 2020 was $253.4 million and $217.5 million, respectively. Based on current exchange rates, the Company expects to record amortization expense as follows over the remaining current year and the five subsequent years:

Fiscal Year	Amount
Remainder of 2021	$	735.9
2022	975.8
2023	954.5
2024	944.9
2025	914.5
2026	873.2

XML

ACCRUED EXPENSES

3 Months Ended

Mar. 31, 2021

Payables and Accruals [Abstract]

ACCRUED EXPENSES

ACCRUED EXPENSES

Accrued expenses consisted of the following:

	As of
	March 31, 2021		December 31, 2020
Accrued construction costs	$	37.8	$	46.5
Accrued income tax payable	22.3		20.6
Accrued pass-through costs	78.3		67.1
Amounts payable for acquisitions	15.7		58.9
Amounts payable to tenants	63.5		66.4
Accrued property and real estate taxes	222.0		219.1
Accrued rent	81.0		82.6
Payroll and related withholdings	67.1		104.4
Other accrued expenses	357.1		378.1
Total accrued expenses	$	944.8	$	1,043.7

XML

LONG-TERM OBLIGATIONS

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

LONG-TERM DEBT OBLIGATIONS

LONG-TERM OBLIGATIONS 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
	March 31, 2021		December 31, 2020		Maturity Date
2020 Term Loan (1) (2)	$	—	$	749.4	N/A
2021 Multicurrency Credit Facility (1)	270.0		—		June 28, 2024
2019 Term Loan (1)	995.8		996.1		January 31, 2025
2021 Credit Facility (1)	2,345.0		2,295.0		January 31, 2026
2.250% senior notes	604.0		605.1		January 15, 2022
4.70% senior notes	699.2		699.0		March 15, 2022
3.50% senior notes	996.5		996.1		January 31, 2023
3.000% senior notes	718.7		721.9		June 15, 2023
0.600% senior notes	497.1		496.8		January 15, 2024
5.00% senior notes	1,001.2		1,001.3		February 15, 2024
3.375% senior notes	646.0		645.7		May 15, 2024
2.950% senior notes	643.4		643.1		January 15, 2025
2.400% senior notes	745.3		745.0		March 15, 2025
1.375% senior notes (3)	580.2		604.1		April 4, 2025
4.000% senior notes	744.8		744.3		June 1, 2025
1.300% senior notes	495.6		495.4		September 15, 2025
4.400% senior notes	497.2		497.1		February 15, 2026
1.600% senior notes	694.4		—		April 15, 2026
1.950% senior notes (3)	581.2		605.2		May 22, 2026
3.375% senior notes	989.9		989.5		October 15, 2026
3.125% senior notes	398.0		397.9		January 15, 2027
2.750% senior notes	744.5		744.3		January 15, 2027
3.55% senior notes	745.0		744.8		July 15, 2027
0.500% senior notes (3)	871.2		907.4		January 15, 2028
3.600% senior notes	693.6		693.4		January 15, 2028
1.500% senior notes	645.3		645.1		January 31, 2028
3.950% senior notes	590.8		590.6		March 15, 2029
3.800% senior notes	1,633.9		1,633.5		August 15, 2029
2.900% senior notes	741.9		741.7		January 15, 2030
2.100% senior notes	740.5		740.2		June 15, 2030
1.875% senior notes	790.8		790.5		October 15, 2030
2.700% senior notes	693.3		—		April 15, 2031
1.000% senior notes (3)	754.5		786.1		January 15, 2032
3.700% senior notes	591.9		591.9		October 15, 2049
3.100% senior notes	1,037.8		1,037.7		June 15, 2050
2.950% senior notes	538.3		538.2		January 15, 2051
Total American Tower Corporation debt	26,956.8		26,113.4
Series 2013-2A securities (4)	1,297.0		1,296.6		March 15, 2023
Series 2018-1A securities (4)	494.8		494.6		March 15, 2028
Series 2015-2 notes (5)	522.2		522.1		June 16, 2025
InSite Debt (6)	—		800.0		N/A
Other subsidiary debt (7)	26.1		32.9		Various
Total American Tower subsidiary debt	2,340.1		3,146.2
Finance lease obligations	29.9		27.9
Total	29,326.8		29,287.5
Less current portion of long-term obligations	(1,336.5)		(789.8)
Long-term obligations	$	27,990.3	$	28,497.7

_______________

(1)Accrues interest at a variable rate.

(2)Repaid in full on February 5, 2021 using borrowings from the 2021 Multicurrency Credit Facility (as defined below) and cash on hand.

(3)Notes are denominated in Euros (“EUR”).

(4)Maturity date reflects the anticipated repayment date; final legal maturity is March 15, 2048.

(5)Maturity date reflects the anticipated repayment date; final legal maturity is June 15, 2050.

(6)Debt entered into by certain InSite subsidiaries acquired in connection with the InSite Acquisition (the “InSite Debt”). On January 15, 2021, all amounts outstanding under the InSite Debt were repaid.

(7)Includes (a) the Colombian credit facility, which is denominated in Colombian Pesos (“COP”) and amortizes through April 24, 2021, (b) debt entered into by the Company’s Kenyan subsidiary in connection with an acquisition of sites in Kenya, which is denominated in U.S. Dollars (“USD”) and is payable either (i) in future installments subject to the satisfaction of specified conditions or (ii) three years from the note origination date, and (c) U.S. subsidiary debt related to a seller-financed acquisition.

Current portion of long-term obligations—The Company’s current portion of long-term obligations primarily includes (i) $600.0 million aggregate principal amount of 2.250% senior unsecured notes due January 15, 2022 and (ii) $700.0 million aggregate principal amount of 4.70% senior unsecured notes due March 15, 2022.

Securitized Debt—Cash flows generated by the sites that secure the securitized debt of the Company are only available for payment of such debt and are not available to pay the Company’s other obligations or the claims of its creditors. However, subject to certain restrictions, the Company holds the right to receive the excess cash flows not needed to service the securitized debt and other obligations arising out of the securitizations. The securitized debt is the obligation of the issuers thereof or borrowers thereunder, as applicable, and their subsidiaries, and not of the Company or its other subsidiaries.

Repayment of InSite Debt—The InSite Debt included securitizations entered into by certain InSite subsidiaries. The Company acquired this debt in connection with the InSite Acquisition. The InSite Debt was recorded at fair value upon acquisition. On January 15, 2021, the Company repaid the entire amount outstanding under the InSite Debt, plus accrued and unpaid interest up to, but excluding, January 15, 2021, for an aggregate redemption price of $826.4 million, including $2.3 million in accrued and unpaid interest. The Company recorded a loss on retirement of long-term obligations of approximately $25.7 million, which includes prepayment consideration partially offset by the unamortized fair value adjustment recorded upon acquisition. The repayment of the InSite Debt was funded with borrowings under the 2021 Multicurrency Credit Facility and the 2021 Credit Facility (as defined below) and cash on hand.

Offerings of Senior Notes

1.600% Senior Notes and 2.700% Senior Notes Offering—On March 29, 2021, the Company completed a registered public offering of $700.0 million aggregate principal amount of 1.600% senior unsecured notes due 2026 (the “1.600% Notes”) and $700.0 million aggregate principal amount of 2.700% senior unsecured notes due 2031 (the “2.700% Notes” and, together with the 1.600% Notes, the “Notes”). The net proceeds from this offering were approximately $1,386.3 million, after deducting commissions and estimated expenses. The Company used all of the net proceeds to repay existing indebtedness under the 2021 Multicurrency Credit Facility.

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)
1.600% Notes	$	700.0	March 29, 2021	April 15, 2026	1.600	%	October 15, 2021	April 15 and October 15	March 15, 2026
2.700% Notes	$	700.0	March 29, 2021	April 15, 2031	2.700	%	October 15, 2021	April 15 and October 15	January 15, 2031

___________

(1)Accrued and unpaid interest 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.

(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.

If the Company undergoes a change of control and corresponding ratings decline, each as defined in the supplemental indenture for the Notes, the Company may be required to repurchase all of the Notes at a purchase price equal to 101% of the principal amount of such Notes, plus accrued and unpaid interest (including additional interest, if any), up to but not including the repurchase date. The Notes rank equally with all of the Company’s other senior unsecured debt and are structurally subordinated to all existing and future indebtedness and other obligations of its subsidiaries.

The supplemental indenture contains certain covenants that restrict the Company’s ability to merge, consolidate or sell assets and its (together with its subsidiaries’) ability to incur liens. These covenants are subject to a number of

exceptions, including that the Company and its subsidiaries may incur certain liens on assets, mortgages or other liens securing indebtedness if the aggregate amount of indebtedness secured by such liens does not exceed 3.5x Adjusted EBITDA, as defined in the applicable supplemental indenture.

Bank Facilities

Amendments to Bank Facilities—On February 10, 2021, the Company amended and restated its senior unsecured multicurrency revolving credit facility (as amended, the “2021 Multicurrency Credit Facility”) and its senior unsecured revolving credit facility (as amended, the “2021 Credit Facility”) and entered into an amendment agreement with respect to its $1.0 billion unsecured term loan, as amended and restated in December 2019 (as amended, the “2019 Term Loan”).

These amendments, among other things,

i.extend the maturity dates by one year to June 28, 2024 and January 31, 2026 for the 2021 Multicurrency Credit Facility and the 2021 Credit Facility, respectively,

ii.increase the commitments under the 2021 Multicurrency Credit Facility and the 2021 Credit Facility to $4.1 billion and $2.9 billion, respectively, of which 1.3 billion EUR borrowed under the 2021 Multicurrency Credit Facility is to be reserved to finance the Pending Telxius Acquisition (as defined in note 14),

iii.increase the maximum Revolving Loan Commitments, after giving effect to any Incremental Commitments (each as defined in the loan agreements for each of the 2021 Multicurrency Credit Facility and the 2021 Credit Facility) to $6.1 billion and $4.4 billion under the 2021 Multicurrency Credit Facility and the 2021 Credit Facility, respectively,

iv.expand the sublimit for multicurrency borrowings under the 2021 Multicurrency Credit Facility from $1.0 billion to $3.0 billion and add a EUR borrowing option for the 2021 Credit Facility with a $1.5 billion sublimit,

v.amend the limitation of the Company’s permitted ratio of Total Debt to Adjusted EBITDA (each as defined in each of the loan agreements for each of the facilities) to be no greater than 7.50 to 1.00 for the four fiscal quarters following the consummation of the Pending Telxius Acquisition, stepping down to 6.00 to 1.00 thereafter (with a further step up to 7.00 to 1.00 if the Company consummates a Qualified Acquisition (as defined in each of the loan agreements for the facilities)),

vi.amend the limitation on indebtedness of, and guaranteed by, the Company’s subsidiaries to the greater of (a) $3.0 billion and (b) 50% of Adjusted EBITDA (as defined in each of the loan agreements for the facilities) of the Company and its subsidiaries on a consolidated basis and

vii.increase the threshold for certain defaults with respect to judgments, attachments or acceleration of indebtedness from $400.0 million to $500.0 million.

2021 Multicurrency Credit Facility—During the three months ended March 31, 2021, the Company borrowed an aggregate of $1.8 billion and repaid an aggregate of $1.6 billion of revolving indebtedness under the 2021 Multicurrency Credit Facility. The Company used the borrowings to repay existing indebtedness, including the InSite Debt and its $750.0 million unsecured term loan due February 12, 2021 (the “2020 Term Loan”), and for general corporate purposes.

2021 Credit Facility—During the three months ended March 31, 2021, the Company borrowed an aggregate of $50.0 million and made no repayments of revolving indebtedness under the 2021 Credit Facility. The Company used the borrowings for general corporate purposes.

Repayment of the 2020 Term Loan—On February 5, 2021, the Company repaid all amounts outstanding under the 2020 Term Loan with borrowings from the 2021 Multicurrency Credit Facility and cash on hand.

2021 Delayed Draw Term Loans—On February 10, 2021, the Company entered into (i) a 1.1 billion EUR (approximately $1.3 billion at the date of signing) unsecured term loan, the proceeds of which are to be used to fund the Pending Telxius Acquisition, with a maturity date that is 364 days from the date of the first draw thereunder and that bears interest at a rate based on the senior unsecured debt rating of the Company, which, based on the Company’s current debt ratings, is 1.000% above the Euro Interbank Offered Rate (“EURIBOR”) (the “2021 364-Day Delayed Draw Term Loan”) and (ii) an 825.0 million EUR (approximately $1.0 billion at the date of signing) unsecured term loan, the proceeds of which are to be used to fund the Pending Telxius Acquisition, with a maturity date that is three years from the date of the first draw thereunder and that bears interest at a rate based on the senior unsecured debt rating of the Company, which, based on the Company’s current debt ratings, is 1.125% above EURIBOR (the “2021 Three Year Delayed Draw Term Loan,” and, together with the 2021 364-Day Delayed Draw Term Loan, the “2021 Delayed Draw Term Loans”).

The loan agreements for the 2021 Delayed Draw Term Loans contain certain reporting, information, financial and operating covenants and other restrictions (including limitations on additional debt, guaranties, sales of assets and liens) with which the Company must comply. Failure to comply with the financial and operating covenants of the loan agreements could not only prevent the Company from being able to borrow additional funds under the revolving credit facilities, but may constitute a default, which could result in, among other things, the amounts outstanding, including all accrued interest and unpaid fees, becoming immediately due and payable.

Bridge Facility—In connection with entering into the Pending Telxius Acquisition, the Company entered into a commitment letter (the “Commitment Letter”), dated January 13, 2021, with Bank of America, N.A. and BofA Securities, Inc. (together, “BofA”) pursuant to which BofA has, with respect to bridge financing, committed to provide up to 7.5 billion EUR (approximately $9.1 billion at the date of signing) in bridge loans (the “Bridge Loan Commitment”) to ensure financing for the Pending Telxius Acquisition. Effective February 10, 2021, the Bridge Loan Commitment was reduced to 4.275 billion EUR (approximately $5.2 billion at the date of signing) as a result of an aggregate of 3.225 billion EUR (approximately $3.9 billion at the date of signing) of additional committed amounts under the 2021 Multicurrency Credit Facility, the 2021 Credit Facility and the 2021 Delayed Draw Term Loans, as described above.

The Commitment Letter contains, and the credit agreement in respect of the Bridge Loan Commitment, if any, will contain, certain customary conditions to funding, including, without limitation, (i) the execution and delivery of definitive financing agreements for the Bridge Loan Commitment and (ii) other customary closing conditions set forth in the Commitment Letter. The Company will pay certain customary commitment fees and, in the event it makes any borrowings in connection with the Bridge Loan Commitment, funding and other fees.

India Credit Facility—During the three months ended March 31, 2021, the Company entered into a working capital facility in India with a borrowing capacity of 1.0 billion Indian Rupees (“INR”) (approximately $13.7 million). The working capital facility is subject to annual renewal and bears interest at a rate equal to the one-month India Treasury Bill rate at the time of borrowing plus a spread. As of March 31, 2021, the Company has not borrowed under this facility.

As of March 31, 2021, the key terms under the 2021 Multicurrency Credit Facility, the 2021 Credit Facility, the 2019 Term Loan, the 2021 364-Day Delayed Draw Term Loan, the 2021 Three Year Delayed Draw Term Loan and the Bridge Loan Commitment were as follows:

	Outstanding Principal Balance (in millions)		Undrawn letters of credit (in millions)		Maturity Date		Current margin over LIBOR or EURIBOR (1)		Current commitment fee (2)
2021 Multicurrency Credit Facility	$	270.0	$	3.8	June 28, 2024	(3)	1.125	%	0.110	%
2021 Credit Facility	$	2,345.0	$	0.8	January 31, 2026	(3)	1.125	%	0.110	%
2019 Term Loan	$	1,000.0	N/A		January 31, 2025		1.125	%	N/A
2021 364-Day Delayed Draw Term Loan	—		N/A		N/A	(4)	1.000	%	0.110	%
2021 Three Year Delayed Draw Term Loan	—		N/A		N/A	(4)	1.125	%	0.110	%
Bridge Loan Commitment (5)	—		N/A		N/A	(5)	1.125	%	0.110	%

_______________

(1)LIBOR, which means the London Interbank Offered Rate, applies to the 2021 Multicurrency Credit Facility, the 2021 Credit Facility and the 2019 Term Loan. EURIBOR, which means the Euro Interbank Offered Rate, applies to the 2021 Delayed Draw Term Loans and the Bridge Loan Commitment.

(2)Fee on undrawn portion of each credit facility.

(3)Subject to two optional renewal periods.

(4)The maturity dates for the 2021 364-Day Delayed Draw Term Loan and the 2021 Three Year Delayed Draw Term Loan are 364 days and three years, respectively, from the date of the first borrowing under each facility. As of March 31, 2021, no borrowings were made under these facilities, and as such, no maturity dates have been set. The Company’s ability to borrow thereunder is subject to the occurrence of certain conditions related to the Pending Telxius Acquisition, as set forth in the agreements for the 2021 Delayed Draw Term Loans.

(5)The Bridge Loan Commitment includes subfacilities relating to the various tranches of closings under the Pending Telxius Acquisition. The maturity dates of the subfacilities are 364 days from the first closing date pursuant to such tranche. Each subfacility is subject to a duration fee that applies to the outstanding principal balance beginning 90 days after the related acquisition closing date. As of March 31, 2021, there have been no closings related to the Pending Telxius Acquisition, and as such, no maturity dates have been set and no duration fees apply.

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FAIR VALUE MEASUREMENTS

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

The Company determines the fair value of its financial instruments based on the fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Below are the three levels of inputs that may be used to measure fair value:

Level 1	Quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
Level 2	Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3	Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Items Measured at Fair Value on a Recurring Basis—The fair values of the Company’s financial assets and liabilities that are required to be measured on a recurring basis at fair value were as follows:

	March 31, 2021					December 31, 2020
	Fair Value Measurements Using					Fair Value Measurements Using
	Level 1		Level 2		Level 3	Level 1		Level 2		Level 3
Assets:
Interest rate swap agreements	—		$	24.5	—	—		$	29.2	—
Liabilities:
Interest rate swap agreements	—		$	0.0	—	—		$	0.1	—
Fair value of debt related to interest rate swap agreements (1)	$	26.3	—		—	$	31.4	—		—

_______________

(1)Included in the carrying values of the corresponding debt obligations.

During the three months ended March 31, 2021, the Company made no changes to the methods described in note 12 to its consolidated financial statements included in the 2020 Form 10-K that it used to measure the fair value of its interest rate swap agreements.

 Items Measured at Fair Value on a Nonrecurring Basis

Assets Held and Used—The Company’s long-lived assets are recorded at amortized cost and, if impaired, are adjusted to fair value using Level 3 inputs. During the three months ended March 31, 2021 and 2020, the Company recorded $0.6 million and $3.7 million of impairments, respectively. There were no other items measured at fair value on a nonrecurring basis during the three months ended March 31, 2021 or 2020.

Fair Value of Financial Instruments—The Company’s financial instruments for which the carrying value reasonably approximates fair value at March 31, 2021 and December 31, 2020 include cash and cash equivalents, restricted cash, accounts receivable and accounts payable. The Company’s estimates of fair value of its long-term obligations, including the current portion, are based primarily upon reported market values. For long-term debt not actively traded, fair value is estimated using either indicative price quotes or a discounted cash flow analysis using rates for debt with similar terms and maturities. As of March 31, 2021 and December 31, 2020, the carrying value of long-term obligations, including the current portion, was $29.3 billion. As of March 31, 2021, the fair value of long-term obligations, including the current portion, was $30.4 billion, of which $24.3 billion was measured using Level 1 inputs and $6.1 billion was measured using Level 2 inputs. As of December 31, 2020, the fair value of long-term obligations, including the current portion, was $31.4 billion, of which $24.0 billion was measured using Level 1 inputs and $7.4 billion was measured using Level 2 inputs.

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INCOME TAXES

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The Company provides for income taxes at the end of each interim period based on the estimated effective tax rate (“ETR”) for the full fiscal year. Cumulative adjustments to the Company’s estimate are recorded in the interim period in which a change in the estimated annual ETR is determined. Under the provisions of the Internal Revenue Code of 1986, as amended, the Company may deduct amounts distributed to stockholders against the income generated by its real estate investment trust (“REIT”) operations. The Company continues to be subject to income taxes on the income of its domestic taxable REIT subsidiaries and income taxes in foreign jurisdictions where it conducts operations. In addition, the Company is able to offset certain income by utilizing its net operating losses, subject to specified limitations.

The Company provides valuation allowances if, based on the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. Management assesses the available evidence to estimate if sufficient future taxable income will be generated to use the existing deferred tax assets.

The increase in the income tax provision during the three months ended March 31, 2021 as compared to the three months ended March 31, 2020 was primarily attributable to an increase in foreign earnings in the current period and higher benefits related to foreign exchange losses during the three months ended March 31, 2020.

As of March 31, 2021 and December 31, 2020, the total unrecognized tax benefits that would impact the ETR, if recognized, were approximately $104.7 million and $105.9 million, respectively. The amount of unrecognized tax benefits during the three months ended March 31, 2021 includes (i) reductions due to foreign currency exchange rate fluctuations of $2.2 million, (ii) reductions to the Company’s prior year tax positions of $1.5 million and (iii) additions to the Company’s existing tax positions of $1.2 million. Unrecognized tax benefits are expected to change over the next 12 months if certain tax matters ultimately settle with the applicable taxing jurisdiction during this time frame, as described in note 13 to the Company’s consolidated financial statements included in the 2020 Form 10-K. The impact of the amount of these changes to previously recorded uncertain tax positions could range from zero to $34.2 million.

The Company recorded the following penalties and income tax-related interest expense during the three months ended March 31, 2021 and 2020:

	Three Months Ended March 31,
	2021		2020
Penalties and income tax-related interest expense	$	3.7	$	1.7

As of March 31, 2021 and December 31, 2020, the total amount of accrued income tax related interest and penalties included in the consolidated balance sheets were $37.1 million and $34.4 million, respectively.

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STOCK-BASED COMPENSATION

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION Summary of Stock-Based Compensation Plans—The Company maintains equity incentive plans that provide for the grant of stock-based awards to its directors, officers and employees. The 2007 Equity Incentive Plan, as amended (the “2007 Plan”), provides for the grant of non-qualified and incentive stock options, as well as restricted stock units, restricted stock and other stock-based awards. Exercise prices for non-qualified and incentive stock options are not less than the fair value of the underlying common stock on the date of grant. Equity awards typically vest ratably, generally over four years for time-based restricted stock units (“RSUs”) and stock options and three years for performance-based restricted stock units (“PSUs”). Stock options generally expire ten years from the date of grant. As of March 31, 2021, the Company had the ability to grant stock-based awards with respect to an aggregate of 5.9 million shares of common

stock under the 2007 Plan. In addition, the Company maintains an employee stock purchase plan (the “ESPP”) pursuant to which eligible employees may purchase shares of the Company’s common stock on the last day of each bi-annual offering period at a 15% discount from the lower of the closing market value on the first or last day of such offering period. The offering periods run from June 1 through November 30 and from December 1 through May 31 of each year.

During the three months ended March 31, 2021 and 2020, the Company recorded and capitalized the following stock-based compensation expense:

	Three Months Ended March 31,
	2021 (1)		2020 (2)
Stock-based compensation expense	$	38.0	$	47.7
Total stock-based compensation expense	$	38.0	$	47.7

_______________

(1)For the three months ended March 31, 2021, stock-based compensation expense consisted of $38.0 million included in selling, general, administrative and development expense.

(2)For the three months ended March 31, 2020, stock-based compensation expense consisted of (i) $0.6 million included in Property costs of operations, (ii) $0.3 million included in Services costs of operations and (iii) $46.8 million included in selling, general, administrative and development expense. For the three months ended March 31, 2020, stock-based compensation expense capitalized as property and equipment was $0.5 million.

Stock Options—As of March 31, 2021, total unrecognized compensation expense related to unvested stock options was less than $0.1 million, which is expected to be recognized over a weighted average period of less than one year.

The Company’s option activity for the three months ended March 31, 2021 was as follows (shares disclosed in full amounts):

	Number of Options
Outstanding as of January 1, 2021	2,016,261
Exercised	(23,958)
Forfeited	—
Expired	—
Outstanding as of March 31, 2021	1,992,303

Restricted Stock Units—As of March 31, 2021, total unrecognized compensation expense related to unvested RSUs granted under the 2007 Plan was $197.7 million and is expected to be recognized over a weighted average period of approximately three years. Vesting of RSUs is subject generally to the employee’s continued employment or death, disability or qualified retirement (each as defined in the applicable RSU award agreement).

Performance-Based Restricted Stock Units—During the three months ended March 31, 2021, the Company’s Compensation Committee (the “Compensation Committee”) granted an aggregate of 92,312 PSUs (the “2021 PSUs”) to its executive officers and established the performance metrics for these awards. During the years ended December 31, 2020 and 2019, the Compensation Committee granted an aggregate of 110,925 PSUs (the “2020 PSUs”) and 114,823 PSUs (the “2019 PSUs”), respectively, to its executive officers and established the performance metrics for these awards. Threshold, target and maximum parameters were established for the metrics for a three-year performance period with respect to each of the 2021 PSUs, the 2020 PSUs and the 2019 PSUs and will be used to calculate the number of shares that will be issuable when each award vests, which may range from zero to 200% of the target amounts. At the end of each three-year performance period, the number of shares that vest will depend on the degree of achievement against the pre-established performance goals. PSUs will be paid out in common stock at the end of each performance period, subject generally to the executive’s continued employment or death, disability or qualified retirement (each as defined in the applicable PSU award agreement). PSUs will accrue dividend equivalents prior to vesting, which will be paid out only in respect of shares that actually vest.

Restricted Stock Units and Performance-Based Restricted Stock Units—The Company’s RSU and PSU activity for the three months ended March 31, 2021 was as follows (shares disclosed in full amounts): 

	RSUs	PSUs
Outstanding as of January 1, 2021 (1)	1,245,075	320,510
Granted (2)	538,239	92,312
Vested and Released (3)	(547,567)	(66,834)
Forfeited	(13,424)	—
Outstanding as of March 31, 2021	1,222,323	345,988
Vested and deferred as of March 31, 2021 (4)	—	96,048

_______________

(1)PSUs consist of the target number of shares issuable at the end of the three-year performance period for the outstanding 2020 PSUs and the outstanding 2019 PSUs, or 70,739 and 86,889 shares, respectively, and the shares issuable at the end of the three-year performance period for the PSUs granted in 2018 (the “2018 PSUs”) based on achievement against the performance metrics for the three-year performance period, or 162,882 shares.

(2)PSUs consist of the target number of shares issuable at the end of the three-year performance period for the 2021 PSUs, or 92,312 shares.

(3)This includes 58,204 of previously vested and deferred RSUs. PSUs consist of shares vested pursuant to the 2018 PSUs. There are no additional shares to be earned related to the 2018 PSUs.

(4)Vested and deferred PSUs are related to deferred compensation for certain former employees.

During the three months ended March 31, 2021, the Company recorded $1.5 million in stock-based compensation expense for equity awards in which the performance goals have been established and were probable of being achieved. The remaining unrecognized compensation expense related to these awards at March 31, 2021 was $20.8 million based on the Company’s current assessment of the probability of achieving the performance goals. The weighted average period over which the cost will be recognized is approximately three years.

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REDEEMABLE NONCONTROLLING INTERESTS

3 Months Ended

Mar. 31, 2021

Noncontrolling Interest [Abstract]

REDEEMABLE NONCONTROLLING INTERESTS

REDEEMABLE NONCONTROLLING INTERESTS

India Redeemable Noncontrolling Interests—On April 21, 2016, the Company, through its wholly owned subsidiary, ATC Asia Pacific Pte. Ltd., acquired a 51% controlling ownership interest in ATC TIPL (formerly Viom), a telecommunications infrastructure company that owns and operates wireless communications towers and indoor DAS networks in India (the “Viom Acquisition”), which was subsequently merged with the Company’s existing India property operations.

In connection with the Viom Acquisition, the Company, through one of its subsidiaries, entered into a shareholders agreement (the “Shareholders Agreement”) with Viom and the following remaining Viom shareholders: Tata Sons Limited (“Tata Sons”), Tata Teleservices Limited (“Tata Teleservices”), IDFC Private Equity Fund III (“IDFC”), Macquarie SBI Infrastructure Investments Pte Limited and SBI Macquarie Infrastructure Trust (together, “Macquarie,” and, collectively with Tata Sons, Tata Teleservices and IDFC, the “Remaining Shareholders”).

The Shareholders Agreement also provides the Remaining Shareholders with put options, which allow them to sell outstanding shares of ATC TIPL to the Company, and the Company with call options, which allow it to buy the noncontrolling shares of ATC TIPL. The put options, which are not under the Company’s control, cannot be separated from the noncontrolling interests. As a result, the combination of the noncontrolling interests and the redemption feature requires classification as redeemable noncontrolling interests in the consolidated balance sheet, separate from equity.

During the three months ended March 31, 2021, the Company made no changes to the methods of determining redemption value described in note 15 to its consolidated financial statements included in the 2020 Form 10-K.

During the year ended December 31, 2020, the Company redeemed 100% of Tata Teleservices and Tata Sons’ remaining combined holdings of ATC TIPL for total consideration of INR 24.8 billion ($337.3 million at the date of redemption). As a result of the redemption, the Company’s controlling interest in ATC TIPL increased from 79% to 92% and the noncontrolling interest decreased from 21% to 8%.

During the three months ended March 31, 2021, the Company entered into an agreement with Macquarie to redeem 100% of their combined holdings in ATC TIPL at a price of INR 175 per share, subject to certain adjustments. Accordingly, the Company expects to pay an amount equivalent to INR 12.9 billion (approximately $176.5 million) to redeem the shares in 2021, subject to regulatory approval. After the completion of the redemption, the Company will hold a 100% ownership interest in ATC TIPL.

Other Redeemable Noncontrolling Interests—During the year ended December 31, 2020, the Company completed the acquisition of MTN Group Limited’s noncontrolling interests in each of the Company’s joint ventures in Ghana and Uganda for total consideration of approximately $524.4 million, including a net adjustment of $1.4 million made during

the three months ended March 31, 2020, which resulted in an increase in the Company’s controlling interests in such joint ventures from 51% to 100%.

In 2019, the Company, through a subsidiary of ATC Europe, entered into an agreement with its local partners in France to form Eure-et-Loir Réseaux Mobiles SAS (“Eure-et-Loir”), a telecommunications infrastructure company that owned and operated wireless communications towers in France. During the three months ended March 31, 2021, the Company liquidated its interests in Eure-et-Loir for total consideration of 2.2 million EUR (approximately $2.5 million at the date of redemption).

The changes in Redeemable noncontrolling interests were as follows:

	Three Months Ended March 31,
	2021		2020
Balance as of January 1,	$	212.1	$	1,096.5
Net income attributable to noncontrolling interests	2.3		7.7
Adjustment to noncontrolling interest redemption value	1.2		(6.3)
Purchase of redeemable noncontrolling interest	(2.5)		(524.4)
Foreign currency translation adjustment attributable to noncontrolling interests	(0.2)		(32.1)
Balance as of March 31,	$	212.9	$	541.4

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EQUITY

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

EQUITY

EQUITY

Sales of Equity Securities—The Company receives proceeds from sales of its equity securities pursuant to the ESPP and upon exercise of stock options granted under the 2007 Plan. During the three months ended March 31, 2021, the Company received an aggregate of $1.9 million in proceeds upon exercises of stock options.

2020 “At the Market” Stock Offering Program—In August 2020, the Company established an “at the market” stock offering program through which it may issue and sell shares of its common stock having an aggregate gross sales price of up to $1.0 billion (the “2020 ATM Program”). Sales under the 2020 ATM Program may be made by means of ordinary brokers’ transactions on the New York Stock Exchange or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or, subject to specific instructions of the Company, at negotiated prices. The Company intends to use the net proceeds from any issuances under the 2020 ATM Program for general corporate purposes, which may include, among other things, the funding of acquisitions, additions to working capital and repayment or refinancing of existing indebtedness. As of March 31, 2021, the Company has not sold any shares of common stock under the 2020 ATM Program.

Stock Repurchase Programs—In March 2011, the Company’s Board of Directors approved a stock repurchase program, pursuant to which the Company is authorized to repurchase up to $1.5 billion of its common stock (the “2011 Buyback”). In December 2017, the Board of Directors approved an additional stock repurchase program, pursuant to which the Company is authorized to repurchase up to $2.0 billion of its common stock (the “2017 Buyback,” and, together with the 2011 Buyback, the “Buyback Programs”).

During the three months ended March 31, 2021, there were no repurchases under either of the Buyback Programs. As of March 31, 2021, the Company has repurchased a total of 14,361,283 shares of its common stock under the 2011 Buyback for an aggregate of $1.5 billion, including commissions and fees. As of March 31, 2021, the Company has not made any repurchases under the 2017 Buyback.

Under the Buyback Programs, the Company is authorized to purchase shares from time to time through open market purchases, in privately negotiated transactions not to exceed market prices, and (with respect to such open market purchases) pursuant to plans adopted in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, in accordance with securities laws and other legal requirements and subject to market conditions and other factors.

The Company expects to fund any further repurchases of its common stock through a combination of cash on hand, cash generated by operations and borrowings under its credit facilities. Repurchases under the Buyback Programs are subject to, among other things, the Company having available cash to fund the repurchases.

Distributions—During the three months ended March 31, 2021, the Company declared or paid the following cash distributions (per share data reflects actual amounts):

Declaration Date	Payment Date	Record Date	Distribution per share		Aggregate Payment Amount (1)
Common Stock
March 4, 2021	April 29, 2021	April 13, 2021	$	1.24	$	551.5
December 3, 2020	February 2, 2021	December 28, 2020	$	1.21	$	537.6

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(1)Does not include amounts accrued for distributions payable related to unvested restricted stock units.

During the three months ended March 31, 2020, the Company declared or paid the following cash distributions (per share data reflects actual amounts):

Declaration Date	Payment Date	Record Date	Distribution per share		Aggregate Payment Amount (1)
Common Stock
March 12, 2020	April 29, 2020	April 14, 2020	$	1.08	$	478.8
December 11, 2019	January 14, 2020	December 27, 2019	$	1.01	$	447.3

_______________

(1)Does not include amounts accrued for distributions payable related to unvested restricted stock units.

The Company accrues distributions on unvested restricted stock units, which are payable upon vesting. As of March 31, 2021, the amount accrued for distributions payable related to unvested restricted stock units was $7.6 million. During the three months ended March 31, 2021 and 2020, the Company paid $7.3 million and $7.6 million of distributions upon the vesting of restricted stock units, respectively. To maintain its qualification for taxation as a REIT, the Company expects to continue paying distributions, the amount, timing and frequency of which will be determined, and subject to adjustment, by the Company’s Board of Directors.

Dividend to noncontrolling interest— The Company’s joint ventures may, from time to time, declare dividends. During the year ended December 31, 2020, ATC Europe declared a dividend of 13.2 million EUR (approximately $16.2 million accrued as of December 31, 2020) payable in cash to the Company and PGGM in proportion to their respective equity interests in the joint venture. The dividend was paid on January 6, 2021.

Purchase of Interests—During the three months ended March 31, 2021, the Company purchased the remaining minority interests held in a subsidiary for an aggregate purchase price of $6.0 million of unregistered shares of the Company’s common stock, in lieu of cash.

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EARNINGS PER COMMON SHARE

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

EARNINGS PER COMMON SHARE

EARNINGS PER COMMON SHARE

The following table sets forth basic and diluted net income per common share computational data (shares in thousands, except per share data):

	Three Months Ended March 31,
	2021		2020
Net income attributable to American Tower Corporation common stockholders	$	645.0	$	415.0
Basic weighted average common shares outstanding	444,486		443,055
Dilutive securities	1,808		2,777
Diluted weighted average common shares outstanding	446,294		445,832
Basic net income attributable to American Tower Corporation common stockholders per common share	$	1.45	$	0.94
Diluted net income attributable to American Tower Corporation common stockholders per common share	$	1.45	$	0.93

Shares Excluded From Dilutive Effect—The following shares were not included in the computation of diluted earnings per share because the effect would be anti-dilutive (in thousands, on a weighted average basis):

	Three Months Ended March 31,
	2021	2020
Restricted stock units	—	86

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COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Litigation—The Company periodically becomes involved in various claims, lawsuits and proceedings that are incidental to its business. In the opinion of Company management, after consultation with counsel, there are no matters currently pending that would, in the event of an adverse outcome, materially impact the Company’s consolidated financial position, results of operations or liquidity.

Verizon Transaction—In March 2015, the Company entered into an agreement with various operating entities of Verizon Communications Inc. (“Verizon”) that currently provides for the lease, sublease or management of approximately 11,250 wireless communications sites commencing March 27, 2015. The average term of the lease or sublease for all sites at the inception of the agreement was approximately 28 years, assuming renewals or extensions of the underlying ground leases for the sites. The Company has the option to purchase the leased sites in tranches, subject to the applicable lease, sublease or management rights upon its scheduled expiration. Each tower is assigned to an annual tranche, ranging from 2034 to 2047, which represents the outside expiration date for the sublease rights to the towers in that tranche. The purchase price for each tranche is a fixed amount stated in the lease for such tranche plus the fair market value of certain alterations made to the related towers. The aggregate purchase option price for the towers leased and subleased is approximately $5.0 billion. Verizon will occupy the sites as a tenant for an initial term of ten years with eight optional successive five-year terms; each such term shall be governed by standard master lease agreement terms established as a part of the transaction.

AT&T Transaction—The Company has an agreement with SBC Communications Inc., a predecessor entity to AT&T Inc. (“AT&T”), that currently provides for the lease or sublease of approximately 2,100 towers commencing between December 2000 and August 2004. Substantially all of the towers are part of the securitization transactions completed in March 2013 and March 2018. The average term of the lease or sublease for all sites at the inception of the agreement was approximately 27 years, assuming renewals or extensions of the underlying ground leases for the sites. The Company has the option to purchase the sites subject to the applicable lease or sublease upon its expiration. Each tower is assigned to an annual tranche, ranging from 2013 to 2032, which represents the outside expiration date for the sublease rights to that tower. The purchase price for each site is a fixed amount stated in the lease for that site plus the fair market value of certain alterations made to the related tower by AT&T. As of March 31, 2021, the Company has purchased an aggregate of 331 of the subleased towers which are subject to the applicable agreement. The aggregate purchase option price for the remaining towers leased and subleased is $997.0 million and includes per annum accretion through the applicable expiration of the lease or sublease of a site. For all such sites, AT&T has the right to continue to lease the reserved space through June 30, 2025 at the then-current monthly fee, which shall escalate in accordance with the standard master lease agreement for the remainder of AT&T’s tenancy. Thereafter, AT&T shall have the right to renew such lease for up to five successive five-year terms.

Other Contingencies—The Company is subject to income tax and other taxes in the geographic areas where it holds assets or operates, and periodically receives notifications of audits, assessments or other actions by taxing authorities. Taxing authorities may issue notices or assessments while audits are being conducted. In certain jurisdictions, taxing authorities may issue assessments with minimal examination. These notices and assessments do not represent amounts that the Company is obligated to pay and are often not reflective of the actual tax liability for which the Company will ultimately be liable. In the process of responding to assessments of taxes that the Company believes are not enforceable, the Company avails itself of both administrative and judicial remedies. The Company evaluates the circumstances of each notification or assessment based on the information available and, in those instances in which the Company does not anticipate a successful defense of positions taken in its tax filings, a liability is recorded in the appropriate amount based on the underlying assessment.

On December 5, 2016, the Company received an income tax assessment of Essar Telecom Infrastructure Private Limited (“ETIPL”) from the India Income Tax Department (the “Tax Department”) for the fiscal year ending 2008 in the amount of INR 4.75 billion ($69.8 million on the date of assessment) related to capital contributions. The Company challenged the assessment before the Office of Commissioner of Income Tax - Appeals, which ruled in the Company’s favor in January 2018. However, the Tax Department has appealed this ruling at a higher appellate authority. The Company estimates that there is a more likely than not probability that the Company’s position will be sustained upon appeal. Accordingly, no liability has been recorded. Additionally, the assessment was made with respect to transactions

that took place in the tax year commencing in 2007, prior to the Company’s acquisition of ETIPL. Under the Company’s definitive acquisition agreement with ETIPL, the seller is obligated to indemnify and defend the Company with respect to any tax-related liability that may arise from activities prior to March 31, 2010.

Guaranties and Indemnifications— If the Company is unable to close the Pending Telxius Acquisition, the Company would be liable under the terms of the agreements to make certain payments to Telxius (each as defined below), which could be material.

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ACQUISITIONS

3 Months Ended

Mar. 31, 2021

Business Combinations [Abstract]

ACQUISITIONS

ACQUISITIONS

Impact of current year acquisitions—The Company typically acquires communications sites and other communications infrastructure assets from wireless carriers or other tower operators and subsequently integrates those sites and related assets into its existing portfolio of communications sites and related assets. The financial results of the Company’s acquisitions have been included in the Company’s consolidated statements of operations for the three months ended March 31, 2021 from the date of the respective acquisition. The date of acquisition, and by extension the point at which the Company begins to recognize the results of an acquisition, may depend on, among other things, the receipt of contractual consents, the commencement and extent of leasing arrangements and the timing of the transfer of title or rights to the assets, which may be accomplished in phases. Sites acquired from communications service providers may never have been operated as a business and may instead have been utilized solely by the seller as a component of its network infrastructure. An acquisition may or may not involve the transfer of business operations or employees.

The Company evaluates each of its acquisitions under the accounting guidance framework to determine whether to treat an acquisition as an asset acquisition or a business combination. For those transactions treated as asset acquisitions, the purchase price is allocated to the assets acquired, with no recognition of goodwill.

For those acquisitions accounted for as business combinations, the Company recognizes acquisition and merger related expenses in the period in which they are incurred and services are received; for transactions accounted for as asset acquisitions, these costs are capitalized as part of the purchase price. Acquisition and merger related costs may include finder’s fees, advisory, legal, accounting, valuation and other professional or consulting fees and general administrative costs directly related to completing the transaction. Integration costs include incremental and non-recurring costs necessary to convert data, retain employees and otherwise enable the Company to operate acquired businesses or assets efficiently. The Company records acquisition and merger related expenses for business combinations, as well as integration costs for all acquisitions, in Other operating expenses in the consolidated statements of operations.

During the three months ended March 31, 2021 and 2020, the Company recorded acquisition and merger related expenses for business combinations and non-capitalized asset acquisition costs and integration costs as follows:

	Three Months Ended March 31,
	2021		2020
Acquisition and merger related expenses	$	34.6	$	7.6
Integration costs	$	16.6	$	6.6

During the three months ended March 31, 2021, the Company also recorded benefits of $4.0 million related to pre-acquisition contingencies and settlements. The increase in acquisition and merger related costs during the three months ended March 31, 2021 was primarily associated with the Pending Telxius Acquisition (as defined below).

2021 Transactions

The estimated aggregate impact of the acquisitions completed in 2021 on the Company’s revenues and gross margin for the three months ended March 31, 2021 was approximately $0.5 million and $0.4 million, respectively. The revenues and gross margin amounts also reflect incremental revenues from the addition of new tenants to such sites subsequent to the transaction date.

Entel Acquisition—On December 19, 2019, the Company entered into a definitive agreement to acquire approximately 3,200 communications sites in Chile and Peru from Entel PCS Telecomunicaciones S.A. and Entel Peru S.A. for total consideration of approximately $0.8 billion (as of the date of signing). The Company completed the acquisition of approximately 2,400 communications sites in December 2019 and an additional 530 communications sites pursuant to this agreement during the year ended December 31, 2020. During the three months ended March 31, 2021, the Company completed the acquisition of an additional 50 communications sites pursuant to this agreement for an aggregate total

purchase price of $14.7 million (as of the dates of acquisition), including value added tax, which are being accounted for as an acquisition of assets and are included in the table below. The remaining communications sites are expected to continue to close in tranches, subject to certain closing conditions.

Other Acquisitions—During the three months ended March 31, 2021, the Company acquired a total of 66 communications sites as well as other communications infrastructure assets in the United States, Mexico and Peru, for an aggregate purchase price of $62.5 million. Of the aggregate purchase price, $4.0 million is reflected as a payable in the consolidated balance sheet as of March 31, 2021. These acquisitions were accounted for as asset acquisitions.

The following table summarizes the allocations of the purchase prices for the fiscal year 2021 acquisitions based upon their estimated fair value at the date of acquisition:

	Allocation (1)
Current assets	$	0.3
Property and equipment	22.5
Intangible assets (2):
Tenant-related intangible assets	37.3
Network location intangible assets	15.7
Other intangible assets	—
Other non-current assets	5.8
Current liabilities	(1.0)
Deferred tax liability	—
Other non-current liabilities	(3.4)
Net assets acquired	77.2
Goodwill	—
Fair value of net assets acquired	77.2
Debt assumed	—
Purchase price	$	77.2

_______________

(1)Includes 12 sites in Peru held pursuant to long-term finance leases.

(2)Tenant-related intangible assets and network location intangible assets are amortized on a straight-line basis generally over a 20 year period.

Other Signed Acquisitions

Orange Acquisition—On November 28, 2019, ATC France, a majority-owned subsidiary of the Company, entered into definitive agreements with Orange S.A. for the acquisition of up to approximately 2,000 communications sites in France over a period of up to five years for total consideration in the range of approximately 500.0 million EUR to 600.0 million EUR (approximately $550.5 million to $660.5 million at the date of signing) to be paid over the five-year term. The Company completed the acquisition of 564 of these sites during the year ended December 31, 2020. Subsequent to March 31, 2021, the Company completed the acquisition of an additional 81 communications sites. The remaining communications sites are expected to close in tranches, subject to customary closing conditions.

Pending Telxius Acquisition—On January 13, 2021, the Company entered into two agreements with Telxius Telecom, S.A. (“Telxius”), a subsidiary of Telefónica, S.A., pursuant to which the Company expects to acquire Telxius’ European and Latin American tower divisions, comprising approximately 31,000 communications sites in Argentina, Brazil, Chile, Germany, Peru and Spain, for approximately 7.7 billion EUR (approximately $9.4 billion at the date of signing) (the “Pending Telxius Acquisition”), subject to certain adjustments. As of April 28, 2021, the Company has received all required government and regulatory approvals in Germany and Spain and expects to close on the majority of the European sites in the second quarter of 2021, with approximately 4,000 sites in Germany expected to close in the third quarter of 2021. The Latin American sites are expected to close either late in the second quarter or in the third quarter of 2021, subject to customary closing conditions, including government and regulatory approval.

2020 Transactions

InSite Acquisition—On December 23, 2020, the Company acquired 100% of the outstanding units of IWG Holdings, LLC, the parent company of InSite, which owned, operated and managed approximately 3,000 communications sites in

the U.S. and Canada. The portfolio included approximately 1,400 owned towers in the United States, over 200 owned towers in Canada and approximately 40 DAS networks in the United States. In addition, the portfolio included more than 600 land parcels under communications sites in the United States, Canada and Australia, as well as approximately 400 rooftop sites. The total consideration for the InSite Acquisition, including cash acquired, the repayment and assumption of certain debt held by InSite, was approximately $3.5 billion, subject to certain post-closing adjustments. The InSite Acquisition was accounted for as a business combination and is subject to post-closing adjustments. During the three months ended March 31, 2021, certain adjustments were made to reduce assets by $3.1 million and increase liabilities by $18.2 million with a corresponding increase in goodwill of $21.3 million and there were no other material post-closing adjustments. The full reconciliation and finalization of the assets acquired and liabilities assumed, including those subject to valuation, have not been completed and, as a result, there may be additional post-closing adjustments.

Pro Forma Consolidated Results (Unaudited)

The following table presents the unaudited pro forma financial results as if the 2021 acquisitions had occurred on January 1, 2020 and the 2020 acquisitions had occurred on January 1, 2019. The pro forma results do not include any anticipated cost synergies, costs or other integration impacts. Accordingly, such pro forma amounts are not necessarily indicative of the results that actually would have occurred had the transactions been completed on the date indicated, nor are they indicative of the future operating results of the Company.

	Three Months Ended March 31,
	2021		2020
Pro forma revenues	$	2,158.9	$	2,044.6
Pro forma net income attributable to American Tower Corporation common stockholders	$	644.9	$	369.8
Pro forma net income per common share amounts:
Basic net income attributable to American Tower Corporation common stockholders	$	1.45	$	0.83
Diluted net income attributable to American Tower Corporation common stockholders	$	1.45	$	0.83

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BUSINESS SEGMENTS

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

BUSINESS SEGMENTS

BUSINESS SEGMENTS

The Company’s primary business is leasing space on multitenant communications sites to wireless service providers, radio and television broadcast companies, wireless data providers, government agencies and municipalities and tenants in a number of other industries. This business is referred to as the Company’s property operations.

During the fourth quarter of 2020, as a result of the InSite Acquisition, the Company updated its reportable segments to rename U.S. property and Asia property to U.S. & Canada property and Asia-Pacific property, respectively. The Company continues to report its results in six segments – U.S. & Canada property, Asia-Pacific property, Africa property, Europe property, Latin America property and services. The change in reportable segment names is solely reflective of the inclusion of Canada and Australia in the Company’s business operations, as a result of the InSite Acquisition, and had no impact on the Company’s consolidated financial statements or historical segment financial information for any prior periods.

As of March 31, 2021, the Company’s property operations consisted of the following:

•U.S. & Canada: property operations in Canada and the United States;

•Asia-Pacific: property operations in Australia and India;

•Africa: property operations in Burkina Faso, Ghana, Kenya, Niger, Nigeria, South Africa and Uganda;

•Europe: property operations in France, Germany and Poland; and

•Latin America: property operations in Argentina, Brazil, Chile, Colombia, Costa Rica, Mexico, Paraguay and Peru.

The Company’s services segment offers tower-related services in the United States, including AZP and structural analysis, which primarily support its site leasing business, including the addition of new tenants and equipment on its sites. The services segment is a strategic business unit that offers different services from, and requires different resources, skill sets and marketing strategies than, the property operating segments.

The accounting policies applied in compiling segment information below are similar to those described in note 1 to the Company’s consolidated financial statements included in the 2020 Form 10-K and as updated in note 1 above. Among other factors, in evaluating financial performance in each business segment, management uses segment gross margin and

segment operating profit. The Company defines segment gross margin as segment revenue less segment operating expenses excluding stock-based compensation expense recorded in costs of operations; Depreciation, amortization and accretion; Selling, general, administrative and development expense; and Other operating expenses. The Company defines segment operating profit as segment gross margin less Selling, general, administrative and development expense attributable to the segment, excluding stock-based compensation expense and corporate expenses. These measures of segment gross margin and segment operating profit are also before Interest income, Interest expense, Gain (loss) on retirement of long-term obligations, Other income (expense), Net income (loss) attributable to noncontrolling interests and Income tax benefit (provision). The categories of expenses indicated above, such as depreciation, have been excluded from segment operating performance as they are not considered in the review of information or the evaluation of results by management. There are no significant revenues resulting from transactions between the Company’s operating segments. All intercompany transactions are eliminated to reconcile segment results and assets to the consolidated statements of operations and consolidated balance sheets.

Summarized financial information concerning the Company’s reportable segments for the three months ended March 31, 2021 and 2020 is shown in the following tables. The “Other” column (i) represents amounts excluded from specific segments, such as business development operations, stock-based compensation expense and corporate expenses included in Selling, general, administrative and development expense; Other operating expenses; Interest income; Interest expense; Gain (loss) on retirement of long-term obligations; and Other income (expense), and (ii) reconciles segment operating profit to Income from continuing operations before income taxes.

	Property										Total  Property		Services		Other		Total
Three Months Ended March 31, 2021	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America
Segment revenues	$	1,231.3	$	281.4	$	235.7	$	44.6	$	336.7	$	2,129.7	$	28.8			$	2,158.5
Segment operating expenses	197.9		175.5		80.9		7.8		101.2		563.3		11.0				574.3
Segment gross margin	1,033.4		105.9		154.8		36.8		235.5		1,566.4		17.8				1,584.2
Segment selling, general, administrative and development expense (1)	39.3		7.1		18.9		5.6		23.3		94.2		4.2				98.4
Segment operating profit	$	994.1	$	98.8	$	135.9	$	31.2	$	212.2	$	1,472.2	$	13.6			$	1,485.8
Stock-based compensation expense															$	38.0	38.0
Other selling, general, administrative and development expense															46.2		46.2
Depreciation, amortization and accretion															522.5		522.5
Other expense (2)															176.5		176.5
Income from continuing operations before income taxes																	$	702.6
Total assets	$	27,331.9	$	5,214.1	$	4,905.4	$	1,836.7	$	7,127.2	$	46,415.3	$	59.4	$	467.8	$	46,942.5

_______________

(1)Segment selling, general, administrative and development expenses exclude stock-based compensation expense of $38.0 million.

(2)Primarily includes interest expense.

	Property										Total  Property		Services		Other		Total
Three Months Ended March 31, 2020	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America
Segment revenues	$	1,089.9	$	286.6	$	225.5	$	34.5	$	336.7	$	1,973.2	$	19.9			$	1,993.1
Segment operating expenses (1)	190.0		164.0		77.7		6.6		105.2		543.5		7.6				551.1
Segment gross margin	899.9		122.6		147.8		27.9		231.5		1,429.7		12.3				1,442.0
Segment selling, general, administrative and development expense (1)	42.0		32.6		17.1		5.5		26.6		123.8		3.5				127.3
Segment operating profit	$	857.9	$	90.0	$	130.7	$	22.4	$	204.9	$	1,305.9	$	8.8			$	1,314.7
Stock-based compensation expense															$	47.7	47.7
Other selling, general, administrative and development expense															43.7		43.7
Depreciation, amortization and accretion															472.3		472.3
Other expense (2)															311.3		311.3
Income from continuing operations before income taxes																	$	439.7
Total assets	$	22,486.9	$	4,986.0	$	4,510.3	$	1,554.5	$	6,739.0	$	40,276.7	$	29.0	$	483.4	$	40,789.1

_______________

(1)Segment operating expenses and segment selling, general, administrative and development expenses exclude stock-based compensation expense of $0.9 million and $46.8 million, respectively.

(2)Primarily includes interest expense.

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Principles of Consolidation and Basis of Presentation

Principles of Consolidation and Basis of Presentation—The accompanying consolidated and condensed consolidated financial statements include the accounts of the Company and those entities in which it has a controlling interest. Investments in entities that the Company does not control are accounted for using the equity method or as investments in equity securities, depending upon the Company’s ability to exercise significant influence over operating and financial policies. All intercompany accounts and transactions have been eliminated.

Change in Reportable Segments

Reportable Segments— During the fourth quarter of 2020, as a result of the Company’s acquisition of InSite Wireless Group, LLC (“InSite,” and the acquisition, the “InSite Acquisition”), the Company updated its reportable segments to rename U.S. property and Asia property to U.S. & Canada property and Asia-Pacific property, respectively. The Company continues to report its results in six segments – U.S. & Canada property, Asia-Pacific property, Africa property, Europe property, Latin America property and services, which are discussed further in note 15. The change in reportable segment names is solely reflective of the inclusion of Canada and Australia in the Company’s business operations, as a result of the InSite Acquisition, and had no impact on the Company’s consolidated financial statements or historical segment financial information for any prior periods.

Revenue

Revenue—The Company’s revenue is derived from leasing the right to use its communications sites and the land on which the sites are located (the “lease component”) and from the reimbursement of costs incurred by the Company in operating the communications sites and supporting the tenants’ equipment as well as other services and contractual rights (the “non-lease component”). Most of the Company’s revenue is derived from leasing arrangements and is accounted for as lease revenue unless the timing and pattern of revenue recognition of the non-lease component differs from the lease component. If the timing and pattern of the non-lease component revenue recognition differs from that of the lease component, the Company separately determines the stand-alone selling prices and pattern of revenue recognition for each performance obligation. Revenue related to distributed antenna system (“DAS”) networks and fiber and other related assets results from agreements with tenants that are not leases. Non-lease revenue—Non-lease revenue consists primarily of revenue generated from DAS networks, fiber and other property related revenue. DAS networks and fiber arrangements require that the Company provide the tenant the right to use the applicable communications infrastructure. Performance obligations are satisfied over time for the duration of the arrangements. Other property related revenue streams, which include site inspections, are not material on either an individual or consolidated basis. There were no material changes in the receivables, contract assets and contract liabilities from contracts with tenants for the three months ended March 31, 2021.Services revenue—The Company offers tower-related services in the United States. These services include site application, zoning and permitting (“AZP”) and structural analysis. There is a single performance obligation related to AZP and revenue is recognized over time based on milestones achieved, which are determined based on costs expected to be incurred. Structural analysis services may have more than one performance obligation, contingent upon the number of contracted services. Revenue is recognized at the point in time the services are completed.

Accounting Standards Updates

Accounting Standards Updates

In March 2020, the Financial Accounting Standards Board (the “FASB”) issued guidance to provide optional expedients and exceptions for applying accounting principles generally accepted in the United States to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The guidance applies only to contracts, hedging relationships and other transactions that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by the guidance do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022 for which an entity has elected certain optional expedients that are retained through the end of the hedging relationship. In January 2021, the FASB issued additional guidance that clarifies that certain practical expedients and exceptions for contract modifications and hedge accounting apply to derivatives that are affected by reference rate reform. As of March 31, 2021, the Company has not modified any contracts as a result of reference rate reform and is evaluating the impact this standard may have on its financial statements.

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Reconciliation of Cash and Cash Equivalents and Restricted Cash

The reconciliation of cash and cash equivalents and restricted cash reported within the applicable balance sheet that sum to the total of the same such amounts shown in the statement of cash flows is as follows:

	Three Months Ended March 31,
	2021		2020
Cash and cash equivalents	$	1,913.6	$	1,326.0
Restricted cash	79.7		74.3
Total cash, cash equivalents and restricted cash	$	1,993.3	$	1,400.3

Summary of Revenue Disaggregated by Source and Geography

A summary of revenue disaggregated by source and geography is as follows:

Three Months Ended March 31, 2021	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America		Total
Non-lease property revenue	$	71.6	$	2.5	$	4.9	$	2.2	$	31.9	$	113.1
Services revenue	28.8		—		—		—		—		28.8
Total non-lease revenue	$	100.4	$	2.5	$	4.9	$	2.2	$	31.9	$	141.9
Property lease revenue	1,159.7		278.9		230.8		42.4		304.8		2,016.6
Total revenue	$	1,260.1	$	281.4	$	235.7	$	44.6	$	336.7	$	2,158.5

Three Months Ended March 31, 2020	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America		Total
Non-lease property revenue	$	58.6	$	2.2	$	2.9	$	1.5	$	32.9	$	98.1
Services revenue	19.9		—		—		—		—		19.9
Total non-lease revenue	$	78.5	$	2.2	$	2.9	$	1.5	$	32.9	$	118.0
Property lease revenue	1,031.3		284.4		222.6		33.0		303.8		1,875.1
Total revenue	$	1,109.8	$	286.6	$	225.5	$	34.5	$	336.7	$	1,993.1

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PREPAID AND OTHER CURRENT ASSETS (Tables)

3 Months Ended

Mar. 31, 2021

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Prepaid and other current assets

Prepaid and other current assets consisted of the following:

	As of
	March 31, 2021		December 31, 2020
Prepaid assets	$	76.2	$	66.1
Prepaid income tax	100.3		143.7
Unbilled receivables	160.8		176.9
Value added tax and other consumption tax receivables	58.1		66.3
Other miscellaneous current assets	95.2		79.6
Prepaid and other current assets	$	490.6	$	532.6

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LEASES (Tables)

3 Months Ended

Mar. 31, 2021

Leases [Abstract]

Schedule of Future Minimum Rental Receipts Expected Under Non-Cancellable Operating Lease Agreements

Future minimum rental receipts expected under non-cancellable operating lease agreements as of March 31, 2021 were as follows:

Fiscal Year	Amount (1)
Remainder of 2021	$	4,632.2
2022	5,976.8
2023	5,866.5
2024	5,755.9
2025	5,330.3
Thereafter	32,576.0
Total	$	60,137.7

_______________

(1)Balances are translated at the applicable period-end exchange rate, which may impact comparability between periods.

Schedule of Information About Other Lease-related Balances

Information about other lease-related balances is as follows:

	As of
	March 31, 2021		December 31, 2020
Operating leases:
Right-of-use asset	$	7,719.9	$	7,789.2
Current portion of lease liability	$	555.8	$	539.9
Lease liability	6,812.9		6,884.4
Total operating lease liability	$	7,368.7	$	7,424.3

Components of Operating Lease Cost

The weighted-average remaining lease terms and incremental borrowing rates are as follows:

	As of
	March 31, 2021		December 31, 2020
Operating leases:
Weighted-average remaining lease term (years)	13.6		13.7
Weighted-average incremental borrowing rate	5.6	%	5.6	%

The following table sets forth the components of lease cost:

	Three Months Ended March 31,
	2021		2020
Operating lease cost	$	251.3	$	250.7
Variable lease costs not included in lease liability (1)	69.3		61.4

_______________

(1)Includes property tax paid on behalf of the landlord.

Supplemental cash flow information is as follows:

	Three Months Ended March 31,
	2021		2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	(244.9)	$	(252.0)
Non-cash items:
New operating leases (1)	$	89.2	$	50.1
Operating lease modifications and reassessments	$	85.7	$	96.9

_______________

(1)Amount includes new operating leases and leases acquired in connection with acquisitions.

Maturity of Operating Lease Liabilities

Maturities of operating lease liabilities as of March 31, 2021 were as follows:

Fiscal Year	Operating Lease (1)
Remainder of 2021	$	678.3
2022	874.6
2023	842.7
2024	805.2
2025	759.8
Thereafter	6,497.9
Total lease payments	10,458.5
Less amounts representing interest	(3,089.8)
Total lease liability	7,368.7
Less current portion of lease liability	555.8
Non-current lease liability	$	6,812.9

_______________

(1)Balances are translated at the applicable period-end exchange rate, which may impact comparability between periods.

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying value of goodwill

The changes in the carrying value of goodwill for each of the Company’s business segments were as follows:

	Property										Services		Total
	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America
Balance as of January 1, 2021	$	4,750.8	$	1,016.9	$	625.6	$	279.1	$	608.3	$	2.0	$	7,282.7
Additions and adjustments (1)	21.3		(0.0)		—		—		—		—		21.3
Effect of foreign currency translation	4.2		(0.5)		(3.4)		(11.1)		(30.8)		—		(41.6)
Balance as of March 31, 2021	$	4,776.3	$	1,016.4	$	622.2	$	268.0	$	577.5	$	2.0	$	7,262.4

_______________

(1)Consists of an aggregate of $21.3 million of measurement period adjustments related to the InSite Acquisition.

Intangible assets subject to amortization

The Company’s other intangible assets subject to amortization consisted of the following:

		As of March 31, 2021						As of December 31, 2020
	Estimated Useful Lives (years)	Gross Carrying Value		Accumulated Amortization		Net Book Value		Gross Carrying Value		Accumulated Amortization		Net Book Value
Acquired network location intangibles (1)	Up to 20	$	5,751.7	$	(2,171.1)	$	3,580.6	$	5,784.0	$	(2,117.6)	$	3,666.4
Acquired tenant-related intangibles	Up to 20	14,221.7		(4,379.6)		9,842.1		14,322.5		(4,237.5)		10,085.0
Acquired licenses and other intangibles	3-20	94.6		(10.0)		84.6		97.8		(9.4)		88.4
Total other intangible assets		$	20,068.0	$	(6,560.7)	$	13,507.3	$	20,204.3	$	(6,364.5)	$	13,839.8

_______________

(1)Acquired network location intangibles are amortized over the shorter of the term of the corresponding ground lease, taking into consideration lease renewal options and residual value, generally up to 20 years, as the Company considers these intangibles to be directly related to the tower assets.

Expected future amortization expenses

Based on current exchange rates, the Company expects to record amortization expense as follows over the remaining current year and the five subsequent years:

Fiscal Year	Amount
Remainder of 2021	$	735.9
2022	975.8
2023	954.5
2024	944.9
2025	914.5
2026	873.2

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ACCRUED EXPENSES (Tables)

3 Months Ended

Mar. 31, 2021

Payables and Accruals [Abstract]

Schedule of accrued expenses

Accrued expenses consisted of the following:

	As of
	March 31, 2021		December 31, 2020
Accrued construction costs	$	37.8	$	46.5
Accrued income tax payable	22.3		20.6
Accrued pass-through costs	78.3		67.1
Amounts payable for acquisitions	15.7		58.9
Amounts payable to tenants	63.5		66.4
Accrued property and real estate taxes	222.0		219.1
Accrued rent	81.0		82.6
Payroll and related withholdings	67.1		104.4
Other accrued expenses	357.1		378.1
Total accrued expenses	$	944.8	$	1,043.7

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LONG-TERM OBLIGATIONS (Tables)

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Schedule of long-term obligations and key terms

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
	March 31, 2021		December 31, 2020		Maturity Date
2020 Term Loan (1) (2)	$	—	$	749.4	N/A
2021 Multicurrency Credit Facility (1)	270.0		—		June 28, 2024
2019 Term Loan (1)	995.8		996.1		January 31, 2025
2021 Credit Facility (1)	2,345.0		2,295.0		January 31, 2026
2.250% senior notes	604.0		605.1		January 15, 2022
4.70% senior notes	699.2		699.0		March 15, 2022
3.50% senior notes	996.5		996.1		January 31, 2023
3.000% senior notes	718.7		721.9		June 15, 2023
0.600% senior notes	497.1		496.8		January 15, 2024
5.00% senior notes	1,001.2		1,001.3		February 15, 2024
3.375% senior notes	646.0		645.7		May 15, 2024
2.950% senior notes	643.4		643.1		January 15, 2025
2.400% senior notes	745.3		745.0		March 15, 2025
1.375% senior notes (3)	580.2		604.1		April 4, 2025
4.000% senior notes	744.8		744.3		June 1, 2025
1.300% senior notes	495.6		495.4		September 15, 2025
4.400% senior notes	497.2		497.1		February 15, 2026
1.600% senior notes	694.4		—		April 15, 2026
1.950% senior notes (3)	581.2		605.2		May 22, 2026
3.375% senior notes	989.9		989.5		October 15, 2026
3.125% senior notes	398.0		397.9		January 15, 2027
2.750% senior notes	744.5		744.3		January 15, 2027
3.55% senior notes	745.0		744.8		July 15, 2027
0.500% senior notes (3)	871.2		907.4		January 15, 2028
3.600% senior notes	693.6		693.4		January 15, 2028
1.500% senior notes	645.3		645.1		January 31, 2028
3.950% senior notes	590.8		590.6		March 15, 2029
3.800% senior notes	1,633.9		1,633.5		August 15, 2029
2.900% senior notes	741.9		741.7		January 15, 2030
2.100% senior notes	740.5		740.2		June 15, 2030
1.875% senior notes	790.8		790.5		October 15, 2030
2.700% senior notes	693.3		—		April 15, 2031
1.000% senior notes (3)	754.5		786.1		January 15, 2032
3.700% senior notes	591.9		591.9		October 15, 2049
3.100% senior notes	1,037.8		1,037.7		June 15, 2050
2.950% senior notes	538.3		538.2		January 15, 2051
Total American Tower Corporation debt	26,956.8		26,113.4
Series 2013-2A securities (4)	1,297.0		1,296.6		March 15, 2023
Series 2018-1A securities (4)	494.8		494.6		March 15, 2028
Series 2015-2 notes (5)	522.2		522.1		June 16, 2025
InSite Debt (6)	—		800.0		N/A
Other subsidiary debt (7)	26.1		32.9		Various
Total American Tower subsidiary debt	2,340.1		3,146.2
Finance lease obligations	29.9		27.9
Total	29,326.8		29,287.5
Less current portion of long-term obligations	(1,336.5)		(789.8)
Long-term obligations	$	27,990.3	$	28,497.7

_______________

(1)Accrues interest at a variable rate.

(2)Repaid in full on February 5, 2021 using borrowings from the 2021 Multicurrency Credit Facility (as defined below) and cash on hand.

(3)Notes are denominated in Euros (“EUR”).

(4)Maturity date reflects the anticipated repayment date; final legal maturity is March 15, 2048.

(5)Maturity date reflects the anticipated repayment date; final legal maturity is June 15, 2050.

(6)Debt entered into by certain InSite subsidiaries acquired in connection with the InSite Acquisition (the “InSite Debt”). On January 15, 2021, all amounts outstanding under the InSite Debt were repaid.

(7)Includes (a) the Colombian credit facility, which is denominated in Colombian Pesos (“COP”) and amortizes through April 24, 2021, (b) debt entered into by the Company’s Kenyan subsidiary in connection with an acquisition of sites in Kenya, which is denominated in U.S. Dollars (“USD”) and is payable either (i) in future installments subject to the satisfaction of specified conditions or (ii) three years from the note origination date, and (c) U.S. subsidiary debt related to a seller-financed acquisition.

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)
1.600% Notes	$	700.0	March 29, 2021	April 15, 2026	1.600	%	October 15, 2021	April 15 and October 15	March 15, 2026
2.700% Notes	$	700.0	March 29, 2021	April 15, 2031	2.700	%	October 15, 2021	April 15 and October 15	January 15, 2031

___________

(1)Accrued and unpaid interest 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.

(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.

Schedule of line of credit facilities

As of March 31, 2021, the key terms under the 2021 Multicurrency Credit Facility, the 2021 Credit Facility, the 2019 Term Loan, the 2021 364-Day Delayed Draw Term Loan, the 2021 Three Year Delayed Draw Term Loan and the Bridge Loan Commitment were as follows:

	Outstanding Principal Balance (in millions)		Undrawn letters of credit (in millions)		Maturity Date		Current margin over LIBOR or EURIBOR (1)		Current commitment fee (2)
2021 Multicurrency Credit Facility	$	270.0	$	3.8	June 28, 2024	(3)	1.125	%	0.110	%
2021 Credit Facility	$	2,345.0	$	0.8	January 31, 2026	(3)	1.125	%	0.110	%
2019 Term Loan	$	1,000.0	N/A		January 31, 2025		1.125	%	N/A
2021 364-Day Delayed Draw Term Loan	—		N/A		N/A	(4)	1.000	%	0.110	%
2021 Three Year Delayed Draw Term Loan	—		N/A		N/A	(4)	1.125	%	0.110	%
Bridge Loan Commitment (5)	—		N/A		N/A	(5)	1.125	%	0.110	%

_______________

(1)LIBOR, which means the London Interbank Offered Rate, applies to the 2021 Multicurrency Credit Facility, the 2021 Credit Facility and the 2019 Term Loan. EURIBOR, which means the Euro Interbank Offered Rate, applies to the 2021 Delayed Draw Term Loans and the Bridge Loan Commitment.

(2)Fee on undrawn portion of each credit facility.

(3)Subject to two optional renewal periods.

(4)The maturity dates for the 2021 364-Day Delayed Draw Term Loan and the 2021 Three Year Delayed Draw Term Loan are 364 days and three years, respectively, from the date of the first borrowing under each facility. As of March 31, 2021, no borrowings were made under these facilities, and as such, no maturity dates have been set. The Company’s ability to borrow thereunder is subject to the occurrence of certain conditions related to the Pending Telxius Acquisition, as set forth in the agreements for the 2021 Delayed Draw Term Loans.

(5)The Bridge Loan Commitment includes subfacilities relating to the various tranches of closings under the Pending Telxius Acquisition. The maturity dates of the subfacilities are 364 days from the first closing date pursuant to such tranche. Each subfacility is subject to a duration fee that applies to the outstanding principal balance beginning 90 days after the related acquisition closing date. As of March 31, 2021, there have been no closings related to the Pending Telxius Acquisition, and as such, no maturity dates have been set and no duration fees apply.

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FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Inputs used to measure fair value

Below are the three levels of inputs that may be used to measure fair value:

Level 1	Quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
Level 2	Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3	Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Schedule of fair value of assets and liabilities

The fair values of the Company’s financial assets and liabilities that are required to be measured on a recurring basis at fair value were as follows:

	March 31, 2021					December 31, 2020
	Fair Value Measurements Using					Fair Value Measurements Using
	Level 1		Level 2		Level 3	Level 1		Level 2		Level 3
Assets:
Interest rate swap agreements	—		$	24.5	—	—		$	29.2	—
Liabilities:
Interest rate swap agreements	—		$	0.0	—	—		$	0.1	—
Fair value of debt related to interest rate swap agreements (1)	$	26.3	—		—	$	31.4	—		—

_______________

(1)Included in the carrying values of the corresponding debt obligations.

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INCOME TAXES (Tables)

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Schedule of penalties and income tax-related interest expense

The Company recorded the following penalties and income tax-related interest expense during the three months ended March 31, 2021 and 2020:

	Three Months Ended March 31,
	2021		2020
Penalties and income tax-related interest expense	$	3.7	$	1.7

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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Summary of stock-based compensation expenses

During the three months ended March 31, 2021 and 2020, the Company recorded and capitalized the following stock-based compensation expense:

	Three Months Ended March 31,
	2021 (1)		2020 (2)
Stock-based compensation expense	$	38.0	$	47.7
Total stock-based compensation expense	$	38.0	$	47.7

_______________

(1)For the three months ended March 31, 2021, stock-based compensation expense consisted of $38.0 million included in selling, general, administrative and development expense.

(2)For the three months ended March 31, 2020, stock-based compensation expense consisted of (i) $0.6 million included in Property costs of operations, (ii) $0.3 million included in Services costs of operations and (iii) $46.8 million included in selling, general, administrative and development expense. For the three months ended March 31, 2020, stock-based compensation expense capitalized as property and equipment was $0.5 million.

Summary of the company's option activity

The Company’s option activity for the three months ended March 31, 2021 was as follows (shares disclosed in full amounts):

	Number of Options
Outstanding as of January 1, 2021	2,016,261
Exercised	(23,958)
Forfeited	—
Expired	—
Outstanding as of March 31, 2021	1,992,303

RSU and PSU activity

The Company’s RSU and PSU activity for the three months ended March 31, 2021 was as follows (shares disclosed in full amounts): 

	RSUs	PSUs
Outstanding as of January 1, 2021 (1)	1,245,075	320,510
Granted (2)	538,239	92,312
Vested and Released (3)	(547,567)	(66,834)
Forfeited	(13,424)	—
Outstanding as of March 31, 2021	1,222,323	345,988
Vested and deferred as of March 31, 2021 (4)	—	96,048

_______________

(1)PSUs consist of the target number of shares issuable at the end of the three-year performance period for the outstanding 2020 PSUs and the outstanding 2019 PSUs, or 70,739 and 86,889 shares, respectively, and the shares issuable at the end of the three-year performance period for the PSUs granted in 2018 (the “2018 PSUs”) based on achievement against the performance metrics for the three-year performance period, or 162,882 shares.

(2)PSUs consist of the target number of shares issuable at the end of the three-year performance period for the 2021 PSUs, or 92,312 shares.

(3)This includes 58,204 of previously vested and deferred RSUs. PSUs consist of shares vested pursuant to the 2018 PSUs. There are no additional shares to be earned related to the 2018 PSUs.

(4)Vested and deferred PSUs are related to deferred compensation for certain former employees.

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REDEEMABLE NONCONTROLLING INTERESTS (Tables)

3 Months Ended

Mar. 31, 2021

Noncontrolling Interest [Abstract]

Changes in Redeemable noncontrolling interest

The changes in Redeemable noncontrolling interests were as follows:

	Three Months Ended March 31,
	2021		2020
Balance as of January 1,	$	212.1	$	1,096.5
Net income attributable to noncontrolling interests	2.3		7.7
Adjustment to noncontrolling interest redemption value	1.2		(6.3)
Purchase of redeemable noncontrolling interest	(2.5)		(524.4)
Foreign currency translation adjustment attributable to noncontrolling interests	(0.2)		(32.1)
Balance as of March 31,	$	212.9	$	541.4

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EQUITY (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Schedule of declared or paid cash distributions

During the three months ended March 31, 2021, the Company declared or paid the following cash distributions (per share data reflects actual amounts):

Declaration Date	Payment Date	Record Date	Distribution per share		Aggregate Payment Amount (1)
Common Stock
March 4, 2021	April 29, 2021	April 13, 2021	$	1.24	$	551.5
December 3, 2020	February 2, 2021	December 28, 2020	$	1.21	$	537.6

_______________

(1)Does not include amounts accrued for distributions payable related to unvested restricted stock units.

During the three months ended March 31, 2020, the Company declared or paid the following cash distributions (per share data reflects actual amounts):

Declaration Date	Payment Date	Record Date	Distribution per share		Aggregate Payment Amount (1)
Common Stock
March 12, 2020	April 29, 2020	April 14, 2020	$	1.08	$	478.8
December 11, 2019	January 14, 2020	December 27, 2019	$	1.01	$	447.3

_______________

(1)Does not include amounts accrued for distributions payable related to unvested restricted stock units.

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EARNINGS PER COMMON SHARE (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Schedule of earnings per basic and diluted by common class

The following table sets forth basic and diluted net income per common share computational data (shares in thousands, except per share data):

	Three Months Ended March 31,
	2021		2020
Net income attributable to American Tower Corporation common stockholders	$	645.0	$	415.0
Basic weighted average common shares outstanding	444,486		443,055
Dilutive securities	1,808		2,777
Diluted weighted average common shares outstanding	446,294		445,832
Basic net income attributable to American Tower Corporation common stockholders per common share	$	1.45	$	0.94
Diluted net income attributable to American Tower Corporation common stockholders per common share	$	1.45	$	0.93

Schedule of antidilutive securities excluded from computation of earnings per share

The following shares were not included in the computation of diluted earnings per share because the effect would be anti-dilutive (in thousands, on a weighted average basis):

	Three Months Ended March 31,
	2021	2020
Restricted stock units	—	86

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ACQUISITIONS (Tables)

3 Months Ended

Mar. 31, 2021

Business Combinations [Abstract]

Schedule of acquisition and merger related costs

During the three months ended March 31, 2021 and 2020, the Company recorded acquisition and merger related expenses for business combinations and non-capitalized asset acquisition costs and integration costs as follows:

	Three Months Ended March 31,
	2021		2020
Acquisition and merger related expenses	$	34.6	$	7.6
Integration costs	$	16.6	$	6.6

Schedule of recognized identified assets acquired and liabilities assumed

The following table summarizes the allocations of the purchase prices for the fiscal year 2021 acquisitions based upon their estimated fair value at the date of acquisition:

	Allocation (1)
Current assets	$	0.3
Property and equipment	22.5
Intangible assets (2):
Tenant-related intangible assets	37.3
Network location intangible assets	15.7
Other intangible assets	—
Other non-current assets	5.8
Current liabilities	(1.0)
Deferred tax liability	—
Other non-current liabilities	(3.4)
Net assets acquired	77.2
Goodwill	—
Fair value of net assets acquired	77.2
Debt assumed	—
Purchase price	$	77.2

_______________

(1)Includes 12 sites in Peru held pursuant to long-term finance leases.

(2)Tenant-related intangible assets and network location intangible assets are amortized on a straight-line basis generally over a 20 year period.

Schedule of pro forma information

The following table presents the unaudited pro forma financial results as if the 2021 acquisitions had occurred on January 1, 2020 and the 2020 acquisitions had occurred on January 1, 2019. The pro forma results do not include any anticipated cost synergies, costs or other integration impacts. Accordingly, such pro forma amounts are not necessarily indicative of the results that actually would have occurred had the transactions been completed on the date indicated, nor are they indicative of the future operating results of the Company.

	Three Months Ended March 31,
	2021		2020
Pro forma revenues	$	2,158.9	$	2,044.6
Pro forma net income attributable to American Tower Corporation common stockholders	$	644.9	$	369.8
Pro forma net income per common share amounts:
Basic net income attributable to American Tower Corporation common stockholders	$	1.45	$	0.83
Diluted net income attributable to American Tower Corporation common stockholders	$	1.45	$	0.83

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BUSINESS SEGMENTS (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Summarized financial information concerning the company's reportable segments

Summarized financial information concerning the Company’s reportable segments for the three months ended March 31, 2021 and 2020 is shown in the following tables. The “Other” column (i) represents amounts excluded from specific segments, such as business development operations, stock-based compensation expense and corporate expenses included in Selling, general, administrative and development expense; Other operating expenses; Interest income; Interest expense; Gain (loss) on retirement of long-term obligations; and Other income (expense), and (ii) reconciles segment operating profit to Income from continuing operations before income taxes.

	Property										Total  Property		Services		Other		Total
Three Months Ended March 31, 2021	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America
Segment revenues	$	1,231.3	$	281.4	$	235.7	$	44.6	$	336.7	$	2,129.7	$	28.8			$	2,158.5
Segment operating expenses	197.9		175.5		80.9		7.8		101.2		563.3		11.0				574.3
Segment gross margin	1,033.4		105.9		154.8		36.8		235.5		1,566.4		17.8				1,584.2
Segment selling, general, administrative and development expense (1)	39.3		7.1		18.9		5.6		23.3		94.2		4.2				98.4
Segment operating profit	$	994.1	$	98.8	$	135.9	$	31.2	$	212.2	$	1,472.2	$	13.6			$	1,485.8
Stock-based compensation expense															$	38.0	38.0
Other selling, general, administrative and development expense															46.2		46.2
Depreciation, amortization and accretion															522.5		522.5
Other expense (2)															176.5		176.5
Income from continuing operations before income taxes																	$	702.6
Total assets	$	27,331.9	$	5,214.1	$	4,905.4	$	1,836.7	$	7,127.2	$	46,415.3	$	59.4	$	467.8	$	46,942.5

_______________

(1)Segment selling, general, administrative and development expenses exclude stock-based compensation expense of $38.0 million.

(2)Primarily includes interest expense.

	Property										Total  Property		Services		Other		Total
Three Months Ended March 31, 2020	U.S. & Canada		Asia-Pacific		Africa		Europe		Latin America
Segment revenues	$	1,089.9	$	286.6	$	225.5	$	34.5	$	336.7	$	1,973.2	$	19.9			$	1,993.1
Segment operating expenses (1)	190.0		164.0		77.7		6.6		105.2		543.5		7.6				551.1
Segment gross margin	899.9		122.6		147.8		27.9		231.5		1,429.7		12.3				1,442.0
Segment selling, general, administrative and development expense (1)	42.0		32.6		17.1		5.5		26.6		123.8		3.5				127.3
Segment operating profit	$	857.9	$	90.0	$	130.7	$	22.4	$	204.9	$	1,305.9	$	8.8			$	1,314.7
Stock-based compensation expense															$	47.7	47.7
Other selling, general, administrative and development expense															43.7		43.7
Depreciation, amortization and accretion															472.3		472.3
Other expense (2)															311.3		311.3
Income from continuing operations before income taxes																	$	439.7
Total assets	$	22,486.9	$	4,986.0	$	4,510.3	$	1,554.5	$	6,739.0	$	40,276.7	$	29.0	$	483.4	$	40,789.1

_______________

(1)Segment operating expenses and segment selling, general, administrative and development expenses exclude stock-based compensation expense of $0.9 million and $46.8 million, respectively.

(2)Primarily includes interest expense.

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - segment	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Number of reportable segments	6
ATC Europe
Concentration Risk [Line Items]
Ownership interest percentage	51.00%
Noncontrolling interest, ownership percentage by noncontrolling owners (as a percent)	49.00%
ATC, TIPL
Concentration Risk [Line Items]
Ownership interest percentage	92.00%	92.00%	79.00%
Noncontrolling interest, ownership percentage by noncontrolling owners (as a percent)		8.00%	21.00%

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 1,913.6	$ 1,746.3	$ 1,326.0
Restricted cash	79.7	115.1	74.3
Total cash, cash equivalents and restricted cash	$ 1,993.3	$ 1,861.4	$ 1,400.3	$ 1,578.0

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - SUMMARY OF REVENUE DISAGGREGATED BY SOURCE AND GEOGRAPHY (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 141.9	$ 118.0
Property lease revenue	2,016.6	1,875.1
Total operating revenues	2,158.5	1,993.1
Non-lease property revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	113.1	98.1
Services revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	28.8	19.9
U.S. & Canada
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	100.4	78.5
Property lease revenue	1,159.7	1,031.3
Total operating revenues	1,260.1	1,109.8
U.S. & Canada | Non-lease property revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	71.6	58.6
U.S. & Canada | Services revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	28.8	19.9
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2.5	2.2
Property lease revenue	278.9	284.4
Total operating revenues	281.4	286.6
Asia-Pacific | Non-lease property revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2.5	2.2
Asia-Pacific | Services revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0.0	0.0
Africa
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4.9	2.9
Property lease revenue	230.8	222.6
Total operating revenues	235.7	225.5
Africa | Non-lease property revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4.9	2.9
Africa | Services revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0.0	0.0
Europe
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2.2	1.5
Property lease revenue	42.4	33.0
Total operating revenues	44.6	34.5
Europe | Non-lease property revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2.2	1.5
Europe | Services revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0.0	0.0
Latin America
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	31.9	32.9
Property lease revenue	304.8	303.8
Total operating revenues	336.7	336.7
Latin America | Non-lease property revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	31.9	32.9
Latin America | Services revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 0.0	$ 0.0

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PREPAID AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid assets	$ 76.2	$ 66.1
Prepaid income tax	100.3	143.7
Unbilled receivables	160.8	176.9
Value added tax and other consumption tax receivables	58.1	66.3
Other miscellaneous current assets	95.2	79.6
Prepaid and other current assets	$ 490.6	$ 532.6

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LEASES - MATURITIES OF MINIMUM RENTAL RECEIPTS EXPECTED UNDER NON-CANCELLABLE OPERATING LEASES (Details) $ in Millions	Mar. 31, 2021 USD ($)
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
Remainder of 2021	$ 4,632.2
2022	5,976.8
2023	5,866.5
2024	5,755.9
2025	5,330.3
Thereafter	32,576.0
Total	$ 60,137.7

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LEASES - SCHEDULE OF INFORMATION ABOUT OTHER LEASE RELATED BALANCES (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Operating leases:
Right-of-use asset	$ 7,719.9	$ 7,789.2
Current portion of lease liability	555.8	539.9
Lease liability	6,812.9	6,884.4
Total lease liability	$ 7,368.7	$ 7,424.3

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LEASES - SCHEDULE OF WEIGHTED AVERAGE LEASE TERMS AND DISCOUNT RATES BY SEGMENT (Details)	Mar. 31, 2021	Dec. 31, 2020
Operating leases:
Weighted-average remaining lease term (years)	13 years 7 months 6 days	13 years 8 months 12 days
Weighted-average incremental borrowing rate	5.60%	5.60%

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LEASES - LEASE COSTS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease cost	$ 251.3	$ 250.7
Variable lease costs not included in lease liability	$ 69.3	$ 61.4

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LEASES - SUPPLEMENTAL CASH FLOW INFOMATION (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ (244.9)	$ (252.0)
Non-cash items:
New operating leases	89.2	50.1
Operating lease modifications and reassessments	$ 85.7	$ 96.9

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LEASES - MATURITIES OF OPERATING AND FINANCE LEASE LIABILITIES (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Operating Lease
Remainder of 2021	$ 678.3
2022	874.6
2023	842.7
2024	805.2
2025	759.8
Thereafter	6,497.9
Total lease payments	10,458.5
Less amounts representing interest	(3,089.8)
Total lease liability	7,368.7	$ 7,424.3
Less current portion of lease liability	(555.8)	(539.9)
Non-current lease liability	$ 6,812.9	$ 6,884.4

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GOODWILL AND OTHER INTANGIBLE ASSETS - CHANGES IN THE CARRYING VALUE OF GOODWILL (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 7,282.7
Additions and adjustments	21.3
Effect of foreign currency translation	(41.6)
Goodwill, ending balance	7,262.4
Property, US
Goodwill [Roll Forward]
Goodwill, beginning balance	4,750.8
Additions and adjustments	21.3
Effect of foreign currency translation	4.2
Goodwill, ending balance	4,776.3
Property, Asia
Goodwill [Roll Forward]
Goodwill, beginning balance	1,016.9
Additions and adjustments	(0.0)
Effect of foreign currency translation	(0.5)
Goodwill, ending balance	1,016.4
Property, Africa
Goodwill [Roll Forward]
Goodwill, beginning balance	625.6
Additions and adjustments	0.0
Effect of foreign currency translation	(3.4)
Goodwill, ending balance	622.2
Property, Europe
Goodwill [Roll Forward]
Goodwill, beginning balance	279.1
Additions and adjustments	0.0
Effect of foreign currency translation	(11.1)
Goodwill, ending balance	268.0
Property, Latin America
Goodwill [Roll Forward]
Goodwill, beginning balance	608.3
Additions and adjustments	0.0
Effect of foreign currency translation	(30.8)
Goodwill, ending balance	577.5
Services
Goodwill [Roll Forward]
Goodwill, beginning balance	2.0
Additions and adjustments	0.0
Effect of foreign currency translation	0.0
Goodwill, ending balance	$ 2.0

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GOODWILL AND OTHER INTANGIBLE ASSETS - INTANGIBLE ASSETS SUBJECT TO AMORTIZATION (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 20,068.0	$ 20,204.3
Accumulated Amortization	(6,560.7)	(6,364.5)
Net Book Value	13,507.3	13,839.8
Acquired network location intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,751.7	5,784.0
Accumulated Amortization	(2,171.1)	(2,117.6)
Net Book Value	$ 3,580.6	3,666.4
Acquired network location intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (years)	20 years
Acquired tenant-related intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 14,221.7	14,322.5
Accumulated Amortization	(4,379.6)	(4,237.5)
Net Book Value	$ 9,842.1	10,085.0
Acquired tenant-related intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (years)	20 years
Acquired licenses and other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 94.6	97.8
Accumulated Amortization	(10.0)	(9.4)
Net Book Value	$ 84.6	$ 88.4
Acquired licenses and other intangibles | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (years)	3 years
Acquired licenses and other intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (years)	20 years

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GOODWILL AND OTHER INTANGIBLE ASSETS - NARRATIVE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 253.4	$ 217.5
Weighted Average
Finite-Lived Intangible Assets [Line Items]
Remaining amortization period (in years)	15 years

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GOODWILL AND OTHER INTANGIBLE ASSETS - EXPECTED FUTURE AMORTIZATION EXPENSE (Details) $ in Millions	Mar. 31, 2021 USD ($)
Fiscal Year
Remainder of 2021	$ 735.9
2022	975.8
2023	954.5
2024	944.9
2025	914.5
2026	$ 873.2

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ACCRUED EXPENSES (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Accrued construction costs	$ 37.8	$ 46.5
Accrued income tax payable	22.3	20.6
Accrued pass-through costs	78.3	67.1
Amounts payable for acquisitions	15.7	58.9
Amounts payable to tenants	63.5	66.4
Accrued property and real estate taxes	222.0	219.1
Accrued rent	81.0	82.6
Payroll and related withholdings	67.1	104.4
Other accrued expenses	357.1	378.1
Total accrued expenses	$ 944.8	$ 1,043.7

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LONG-TERM OBLIGATIONS - SCHEDULE OF LONG-TERM OBLIGATIONS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 29, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Finance lease obligations	$ 29.9		$ 27.9
Total	29,326.8		29,287.5
Less current portion of long-term obligations	(1,336.5)		(789.8)
Long-term obligations	27,990.3		28,497.7
American Tower Corporation
Debt Instrument [Line Items]
Long-term debt	26,956.8		26,113.4
American Tower subsidiary
Debt Instrument [Line Items]
Long-term debt	2,340.1		3,146.2
2020 Term Loan | Unsecured debt | American Tower Corporation
Debt Instrument [Line Items]
Long-term debt	0.0		749.4
2021 Multicurrency Credit Facility | Credit Facility | American Tower Corporation
Debt Instrument [Line Items]
Long-term debt	270.0		0.0
2019 Term Loan | Unsecured debt | American Tower Corporation
Debt Instrument [Line Items]
Long-term debt	995.8		996.1
Credit Facility 2021 | Credit Facility | American Tower Corporation
Debt Instrument [Line Items]
Long-term debt	$ 2,345.0		2,295.0
2.250% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	2.25%
Long-term debt	$ 604.0		605.1
4.70% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	4.70%
Long-term debt	$ 699.2		699.0
3.50% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	3.50%
Long-term debt	$ 996.5		996.1
3.000% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	3.00%
Long-term debt	$ 718.7		721.9
0.600% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	0.60%
Long-term debt	$ 497.1		496.8
5.00% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	5.00%
Long-term debt	$ 1,001.2		1,001.3
3.375% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	3.375%
Long-term debt	$ 646.0		645.7
2.950% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	2.95%
Long-term debt	$ 643.4		643.1
2.400% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	2.40%
Long-term debt	$ 745.3		745.0
1.375% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	1.375%
Long-term debt	$ 580.2		604.1
4.000% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	4.00%
Long-term debt	$ 744.8		744.3
1.300% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	1.30%
Long-term debt	$ 495.6		495.4
4.400% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	4.40%
Long-term debt	$ 497.2		497.1
1.600% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate		1.60%
Long-term debt	$ 694.4		0.0
1.950% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	1.95%
Long-term debt	$ 581.2		605.2
3.375% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	3.375%
Long-term debt	$ 989.9		989.5
3.125% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	3.125%
Long-term debt	$ 398.0		397.9
2.750% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	2.75%
Long-term debt	$ 744.5		744.3
3.55% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	3.55%
Long-term debt	$ 745.0		744.8
0.500% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	0.50%
Long-term debt	$ 871.2		907.4
3.600% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	3.60%
Long-term debt	$ 693.6		693.4
1.500% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	1.50%
Long-term debt	$ 645.3		645.1
3.950% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	3.95%
Long-term debt	$ 590.8		590.6
3.800% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	3.80%
Long-term debt	$ 1,633.9		1,633.5
2.900% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	2.90%
Long-term debt	$ 741.9		741.7
2.100% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	2.10%
Long-term debt	$ 740.5		740.2
1.875% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	1.875%
Long-term debt	$ 790.8		790.5
2.700% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate		2.70%
Long-term debt	$ 693.3		0.0
1.000% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	1.00%
Long-term debt	$ 754.5		786.1
3.700% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	3.70%
Long-term debt	$ 591.9		591.9
3.100% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	3.10%
Long-term debt	$ 1,037.8		1,037.7
2.950% senior notes | Senior notes | American Tower Corporation
Debt Instrument [Line Items]
Debt interest rate	2.95%
Long-term debt	$ 538.3		538.2
Series 2013-2A securities | Secured debt | American Tower subsidiary
Debt Instrument [Line Items]
Long-term debt	1,297.0		1,296.6
Series 2018-1A securities | Secured debt | American Tower subsidiary
Debt Instrument [Line Items]
Long-term debt	494.8		494.6
Series 2015-2 notes | Secured debt | American Tower subsidiary
Debt Instrument [Line Items]
Long-term debt	522.2		522.1
Insite Debt | American Tower subsidiary
Debt Instrument [Line Items]
Long-term debt	0.0		800.0
Other subsidiary debt | Unsecured debt | American Tower subsidiary
Debt Instrument [Line Items]
Long-term debt	$ 26.1		$ 32.9
Debt repayment period	3 years

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LONG-TERM OBLIGATIONS - CURRENT PORTION OF LONG TERM DEBT (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 1,336.5	$ 789.8
American Tower Corporation | 2.250% senior notes | Senior notes
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 600.0
Debt interest rate	2.25%
American Tower Corporation | 4.70% senior notes | Senior notes
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 700.0
Debt interest rate	4.70%

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LONG-TERM OBLIGATIONS - INSITE DEBT (Details) - USD ($) $ in Millions		3 Months Ended
	Jan. 15, 2021	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Loss on retirement of long-term obligations		$ (25.7)	$ (34.6)
Insite Acquisition | Insite Debt
Debt Instrument [Line Items]
Debt Instrument, repurchase amount	$ 826.4
Interest expense	2.3
Loss on retirement of long-term obligations	$ 25.7

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LONG-TERM OBLIGATIONS - OFFERINGS OF SENIOR NOTES (Details) $ in Millions		3 Months Ended
	Mar. 29, 2021 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Debt Instrument [Line Items]
Proceeds from term loan		$ 0.0	$ 750.0
Debt redemption price rate (as a percent)		101.00%
Maximum adjusted EBITDA		3.5
American Tower Corporation | 1.600% senior notes | Senior notes
Debt Instrument [Line Items]
Senior note public offering, amount	$ 700.0
Debt interest rate	1.60%
Debt redemption price rate (as a percent)	100.00%
American Tower Corporation | 2.700% senior notes | Senior notes
Debt Instrument [Line Items]
Senior note public offering, amount	$ 700.0
Debt interest rate	2.70%
Debt redemption price rate (as a percent)	100.00%
American Tower Corporation | 2026 and 2031 Notes | Senior notes
Debt Instrument [Line Items]
Proceeds from term loan	$ 1,386.3

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LONG-TERM DEBT OBLIGATIONS - SCHEDULE OF KEY TERMS (Details) - USD ($) $ in Millions		3 Months Ended
	Mar. 29, 2021	Mar. 31, 2021
Debt Instrument [Line Items]
Debt, interest accrual period		360 days
Debt redemption price rate (as a percent)		101.00%
Senior Notes | 1.600% senior notes | American Tower Corporation
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 700.0
Contractual Interest Rate	1.60%
Debt redemption price rate (as a percent)	100.00%
Senior Notes | 2.700% senior notes | American Tower Corporation
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 700.0
Contractual Interest Rate	2.70%
Debt redemption price rate (as a percent)	100.00%

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LONG-TERM OBLIGATIONS - BANK FACILITIES (Details)		3 Months Ended
	Feb. 10, 2021 EUR (€)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Feb. 10, 2021 USD ($)	Feb. 10, 2021 EUR (€)
Line of Credit Facility [Line Items]
Borrowings under credit facilities		$ 1,870,000,000.0	$ 2,642,300,000
Credit Facility
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity				$ 3,900,000,000	€ 3,225,000,000
Credit Facility | Credit Facility 2019
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity		1,000,000,000.0
Credit Facility | 2021 Multicurrency Credit Facility
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity				$ 6,100,000,000
Total debt to adjusted EBITDA ratio, maximum				7.50	7.50
Total debt to adjusted EBITDA ratio, step down				6.00	6.00
Total debt to adjusted EBITDA ratio, after a qualified acquisition				7.00	7.00
Limitation of indebtedness guaranteed by subsidiaries				$ 3,000,000,000.0
Limitation of indebtedness guaranteed by subsidiaries rate				50.00%	50.00%
Default threshold		400,000,000.0		$ 500,000,000.0
Credit Facility | 2021 Multicurrency Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity				4,100,000,000
Borrowings under credit facilities | €	€ 1,300,000,000
Credit Facility | 2021 Credit Facility
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity				$ 4,400,000,000
Total debt to adjusted EBITDA ratio, maximum				7.50	7.50
Total debt to adjusted EBITDA ratio, step down				6.00	6.00
Total debt to adjusted EBITDA ratio, after a qualified acquisition				7.00	7.00
Limitation of indebtedness guaranteed by subsidiaries				$ 3,000,000,000.0
Limitation of indebtedness guaranteed by subsidiaries rate				50.00%	50.00%
Credit Facility | 2021 Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity				$ 2,900,000,000
Letter of Credit | 2021 Multicurrency Credit Facility
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity		$ 1,000,000,000.0		$ 3,000,000,000.0
Letter of Credit | 2021 Credit Facility
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity | €					€ 1,500,000,000

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LONG-TERM OBLIGATIONS - CREDIT FACILITIES (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Line of Credit Facility [Line Items]
Borrowings under credit facilities	$ 1,870,000,000.0	$ 2,642,300,000
American Tower Corporation | Credit Facility | 2021 Multicurrency Credit Facility
Line of Credit Facility [Line Items]
Repayment of indebtedness under credit facility	1,600,000,000
Borrowings under credit facilities	1,800,000,000
American Tower Corporation | Credit Facility | InSite Debt and 2020 Term Loan
Line of Credit Facility [Line Items]
Repayment of indebtedness under credit facility	750,000,000.0
American Tower Corporation | Credit Facility | 2021 Credit Facility
Line of Credit Facility [Line Items]
Repayment of indebtedness under credit facility	0
Borrowings under credit facilities	$ 50,000,000.0

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LONG-TERM OBLIGATIONS - 2021 DELAYED DRAW TERM LOANS (Details) - Feb. 10, 2021 - Unsecured debt $ in Billions	USD ($)	EUR (€)
2021 364-Day Delayed Draw Term Loan
Debt Instrument [Line Items]
Senior note public offering, amount	$ 1.3	€ 1,100,000,000
Debt Instrument, Term	364 days
2021 364-Day Delayed Draw Term Loan | Euro Interbank Offered Rate (EURIBOR)
Debt Instrument [Line Items]
Current margin over LIBOR (as a percent)	1.00%
2021 Three Year Delayed Draw Term Loan
Debt Instrument [Line Items]
Senior note public offering, amount	$ 1.0	€ 825,000,000.0
Debt Instrument, Term	3 years
2021 Three Year Delayed Draw Term Loan | Euro Interbank Offered Rate (EURIBOR)
Debt Instrument [Line Items]
Current margin over LIBOR (as a percent)	1.125%

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LONG-TERM OBLIGATIONS - BRIDGE FACILITY (Details) - Credit Facility $ in Billions	Feb. 10, 2021 USD ($)	Feb. 10, 2021 EUR (€)	Jan. 13, 2021 USD ($)	Jan. 13, 2021 EUR (€)
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity	$ 3.9	€ 3,225,000,000
Bridge Loan
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity	$ 5.2	€ 4,275,000,000	$ 9.1	€ 7,500,000,000

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LONG-TERM OBLIGATIONS - SCHEDULE OF LINES OF CREDIT (Details) - American Tower Corporation $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) renewalPeriod
Credit Facility
Line of Credit Facility [Line Items]
Optional renewal periods | renewalPeriod	2
2021 Multicurrency Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Outstanding Principal Balance	$ 270.0
Undrawn letters of credit	$ 3.8
Current commitment fee (as a percent)	0.11%
2021 Multicurrency Credit Facility | Credit Facility | Current margin over LIBOR
Line of Credit Facility [Line Items]
Current margin over LIBOR (as a percent)	1.125%
2021 Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Outstanding Principal Balance	$ 2,345.0
Undrawn letters of credit	$ 0.8
Current commitment fee (as a percent)	0.11%
2021 Credit Facility | Credit Facility | Current margin over LIBOR
Line of Credit Facility [Line Items]
Current margin over LIBOR (as a percent)	1.125%
2019 Term Loan | Unsecured debt
Line of Credit Facility [Line Items]
Outstanding Principal Balance	$ 1,000.0
2019 Term Loan | Unsecured debt | Current margin over LIBOR
Line of Credit Facility [Line Items]
Current margin over LIBOR (as a percent)	1.125%
2021 364-Day Delayed Draw Term Loan
Line of Credit Facility [Line Items]
Outstanding Principal Balance	$ 0.0
Current commitment fee (as a percent)	0.11%
2021 364-Day Delayed Draw Term Loan | Current margin over LIBOR
Line of Credit Facility [Line Items]
Current margin over LIBOR (as a percent)	1.00%
2021 Three Year Delayed Draw Term Loan
Line of Credit Facility [Line Items]
Outstanding Principal Balance	$ 0.0
Current commitment fee (as a percent)	0.11%
2021 Three Year Delayed Draw Term Loan | Current margin over LIBOR
Line of Credit Facility [Line Items]
Current margin over LIBOR (as a percent)	1.125%
Bridge Loan
Line of Credit Facility [Line Items]
Outstanding Principal Balance	$ 0.0
Current commitment fee (as a percent)	0.11%
Bridge Loan | Current margin over LIBOR
Line of Credit Facility [Line Items]
Current margin over LIBOR (as a percent)	1.125%

XML

LONG-TERM OBLIGATIONS - INDIA CREDIT FACILITY (Details) - Mar. 31, 2021	USD ($)	INR (₨)
India Credit Facility | Working Capital Facility
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity	$ 13,700,000	₨ 1,000,000,000.0

XML

FAIR VALUE MEASUREMENTS - ASSETS AND LIABILITIES MEASURED AT FAIR VALUE ON A RECURRING BASIS (Details) - Fair Value, Measurements, Recurring - Interest rate swap agreements - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Level 1
Assets:
Interest rate swap agreements	$ 0.0	$ 0.0
Liabilities:
Interest rate swap agreements	0.0	0.0
Fair value of debt related to interest rate swap	26.3	31.4
Level 2
Assets:
Interest rate swap agreements	24.5	29.2
Liabilities:
Interest rate swap agreements	0.0	0.1
Fair value of debt related to interest rate swap	0.0	0.0
Level 3
Assets:
Interest rate swap agreements	0.0	0.0
Liabilities:
Interest rate swap agreements	0.0	0.0
Fair value of debt related to interest rate swap	$ 0.0	$ 0.0

XML

FAIR VALUE MEASUREMENTS - NARRATIVE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairments	$ 0.6	$ 3.7
Long-term obligations	29,326.8		$ 29,287.5
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	30,400.0		31,400.0
Estimate of Fair Value Measurement | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	24,300.0		24,000.0
Estimate of Fair Value Measurement | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	$ 6,100.0		$ 7,400.0

XML

INCOME TAXES - NARRATIVE (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact the ETR	$ 104,700,000	$ 105,900,000
Unrecognized tax benefits, decrease resulting from prior period tax positions	1,500,000
Unrecognized tax benefits, increase resulting from current period tax positions	1,200,000
Unrecognized tax benefits, income tax penalties and interest accrued	37,100,000	$ 34,400,000
Unrecognized tax benefits, decrease from foreign currency exchange rate fluctuations	2,200,000
Minimum
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	0
Maximum
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	$ 34,200,000

XML

INCOME TAXES - SCHEDULE OF PENALTIES AND INCOME TAX RELATED EXPENSES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Penalties and income tax-related interest expense	$ 3.7	$ 1.7

XML

STOCK-BASED COMPENSATION - NARRATIVE (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP, discount rate (as a percent)	15.00%
Total unrecognized compensation expense	$ 0.1
Stock-based compensation expense	$ 38.0	$ 47.7
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected recognition of stock award compensation expense weighted average period ( less than one year for stock options)	3 years
Granted (in shares)	538,239
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years	3 years	3 years	3 years	3 years	3 years
Total unrecognized compensation expense	$ 20.8
Expected recognition of stock award compensation expense weighted average period ( less than one year for stock options)	3 years
Granted (in shares)	92,312				110,925	114,823
Stock-based compensation expense	$ 1.5
Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of potential target shares	0.00%
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of potential target shares	200.00%
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected recognition of stock award compensation expense weighted average period ( less than one year for stock options)	1 year
2007 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issuable under stock incentive plan (in shares)	5,900,000
2007 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Total unrecognized compensation expense	$ 197.7
2007 Plan | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2007 Plan | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
2021 PSUs | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	92,312

XML

STOCK-BASED COMPENSATION - SUMMARY OF STOCK-BASED COMPENSATION EXPENSE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 38.0	$ 47.7
Amount capitalized		0.5
Property costs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense		0.6
Services
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense		0.3
Selling, General and Administrative Expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 38.0	$ 46.8

XML

STOCK-BASED COMPENSATION - SUMMARY OF THE COMPANY'S OPTION ACTIVITY (Details)	3 Months Ended
	Mar. 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding as of January 1, 2020 (in shares)	2,016,261
Exercised (in shares)	(23,958)
Forfeited (in shares)	0
Expired (in shares)	0
Outstanding as of September 30, 2020 (in shares)	1,992,303

XML

STOCK-BASED COMPENSATION - SUMMARY OF THE COMPANY'S RESTRICTED STOCK UNIT ACTIVITY (Details) - shares	3 Months Ended				12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance (in shares)	1,245,075
Granted (in shares)	538,239
Vested (in shares)	(547,567)
Forfeited (in shares)	(13,424)
Ending balance (in shares)	1,222,323				1,245,075
Vested and deferred as of September 30, 2020 (in shares)	0						58,204
PSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance (in shares)	320,510
Granted (in shares)	92,312				110,925	114,823
Vested (in shares)	(66,834)
Forfeited (in shares)	0
Ending balance (in shares)	345,988				320,510
Vested and deferred as of September 30, 2020 (in shares)	96,048
Vesting period	3 years	3 years	3 years	3 years	3 years	3 years
2020 PSUs | PSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance (in shares)	70,739
Ending balance (in shares)					70,739
2019 PSUs | PSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance (in shares)	86,889
Ending balance (in shares)					86,889
2018 PSUs | PSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance (in shares)	162,882
Ending balance (in shares)					162,882

XML

REDEEMABLE NONCONTROLLING INTERESTS - NARRATIVE (Details) $ / shares in Units, € in Millions, $ in Millions, ₨ in Billions	3 Months Ended				12 Months Ended
	Mar. 31, 2021 USD ($) $ / shares	Mar. 31, 2021 INR (₨)	Mar. 31, 2021 EUR (€)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 INR (₨)	Apr. 29, 2021	Dec. 31, 2019	Apr. 21, 2016
Noncontrolling Interest [Line Items]
Purchase of redeemable noncontrolling interest	$ 2.5			$ 524.4
ATC, TIPL
Noncontrolling Interest [Line Items]
Ownership interest percentage	92.00%				92.00%	92.00%		79.00%
Noncontrolling interest, ownership percentage by noncontrolling owners (as a percent)					8.00%	8.00%		21.00%
ATC, TIPL | Subsequent Event
Noncontrolling Interest [Line Items]
Ownership interest percentage							100.00%
Ghana and Uganda Subsidiaries
Noncontrolling Interest [Line Items]
Purchase of redeemable noncontrolling interest	$ 524.4
Ownership interest percentage	100.00%				51.00%	51.00%
Payments for repurchase of redeemable noncontrolling interest, interest portion	$ 1.4
Eure-et-Loir
Noncontrolling Interest [Line Items]
Purchase of redeemable noncontrolling interest	$ 2.5		€ 2.2
Tata Teleservices Limited
Noncontrolling Interest [Line Items]
Percentage of ownership before transaction					100.00%	100.00%
Purchase of redeemable noncontrolling interest					$ 337.3	₨ 24.8
Macquarie | ATC, TIPL
Noncontrolling Interest [Line Items]
Percentage of ownership before transaction	100.00%	100.00%	100.00%
Purchase of redeemable noncontrolling interest	$ 176.5	₨ 12.9
Temporary equity, redemption price per share (in dollars per share) | $ / shares	$ 175
Viom Transaction
Noncontrolling Interest [Line Items]
Percentage of interests acquired									51.00%

XML

REDEEMABLE NONCONTROLLING INTERESTS - CHANGE IN REDEEMABLE NONCONTROLLING INTEREST (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Noncontrolling Interest [Abstract]
Balance as of January 1,	$ 212.1	$ 1,096.5	$ 1,096.5
Net income attributable to noncontrolling interests	2.3	7.7
Adjustment to noncontrolling interest redemption value	1.2	(6.3)
Purchase of redeemable noncontrolling interest	(2.5)	(524.4)
Foreign currency translation adjustment attributable to noncontrolling interests	(0.2)	(32.1)
Balance as of March 31,	$ 212.9	$ 541.4	$ 212.1

XML

EQUITY - NARRATIVE (Details) € in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2017 USD ($)	Mar. 31, 2011 USD ($)
Class of Stock [Line Items]
Proceeds from stock options		$ 1,900,000	$ 11,100,000
Stock offering, value (up to)	$ 1,000,000,000.0
Treasury stock repurchased			45,100,000
Accrued dividend RSU		7,600,000
Paid dividend RSU		7,300,000	$ 7,600,000
Payments to acquire noncontrolling interest		$ 6,000,000.0
Subsidiary Interest
Class of Stock [Line Items]
Ownership interest percentage		100.00%
ATC Europe
Class of Stock [Line Items]
Dividends				$ 16,200,000	€ 13.2
2020 ATM Program
Class of Stock [Line Items]
Stock offerings (in shares) | shares		0
2011 Buyback
Class of Stock [Line Items]
Stock repurchase program, authorized amount							$ 1,500,000,000
Treasury stock activity (in shares) | shares		14,361,283
Treasury stock repurchased		$ 1,500,000,000
2017 Buyback
Class of Stock [Line Items]
Stock repurchase program, authorized amount						$ 2,000,000,000.0
Treasury stock activity (in shares) | shares		0

XML

EQUITY - DISTRIBUTIONS (Details) - USD ($) $ / shares in Units, $ in Millions								3 Months Ended		4 Months Ended
	Apr. 29, 2021	Mar. 04, 2021	Feb. 02, 2021	Dec. 03, 2020	Mar. 12, 2020	Jan. 14, 2020	Dec. 11, 2019	Mar. 31, 2021	Mar. 31, 2020	Apr. 29, 2020
Dividends Payable [Line Items]
Aggregate Payment Amount on common stock								$ 544.9	$ 454.9
Common Stock
Dividends Payable [Line Items]
Distribution per share, common stock (in dollars per share)		$ 1.24		$ 1.21	$ 1.08		$ 1.01
Aggregate Payment Amount on common stock			$ 537.6			$ 447.3				$ 478.8
Common Stock | Subsequent Event
Dividends Payable [Line Items]
Aggregate Payment Amount on common stock	$ 551.5

XML

EARNINGS PER COMMON SHARE - SCHEDULE OF EARNINGS PER BASIC AND DILUTED BY COMMON CLASS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income attributable to American Tower Corporation common stockholders	$ 645.0	$ 415.0
Basic weighted average common shares outstanding (in shares)	444,486	443,055
Dilutive securities (in shares)	1,808	2,777
Diluted weighted average common shares outstanding (in shares)	446,294	445,832
Basic net income attributable to American Tower Corporation common stockholders per common share (in dollars per share)	$ 1.45	$ 0.94
Diluted net income attributable to American Tower Corporation common stockholders per common share (in dollars per share)	$ 1.45	$ 0.93

XML

EARNINGS PER COMMON SHARE - SCHEDULE OF SHARES EXCLUDED FROM COMPUTATION OF EARNINGS PER SHARE (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from dilutive effect (in shares)	0	86

XML

COMMITMENTS AND CONTINGENCIES - NARRATIVE (Details) ₨ in Millions, $ in Millions				3 Months Ended
	Dec. 05, 2016 USD ($)	Dec. 05, 2016 INR (₨)	Mar. 27, 2015 USD ($) communications_site renewalPeriod	Mar. 31, 2021 USD ($) communications_site renewalPeriod	Dec. 31, 2000 communications_site
INDIA
Loss Contingencies [Line Items]
Foreign income tax assessment	$ 69.8	₨ 4,750
Verizon Transaction
Loss Contingencies [Line Items]
Leased assets, number of communication sites | communications_site			11,250
Right to lease, weighted average term			28 years
Aggregate purchase option price for towers | $			$ 5,000.0
Customer lease, initial term			10 years
Successive terms to renew lease (in numbers of terms) | renewalPeriod			8
Lease renewal term			5 years
AT&T Transaction
Loss Contingencies [Line Items]
Leased assets, number of communication sites | communications_site				331	2,100
Aggregate purchase option price for towers | $				$ 997.0
Successive terms to renew lease (in numbers of terms) | renewalPeriod				5
Lease renewal term				5 years
Operating lease, term of contract				27 years

XML

ACQUISITIONS - SCHEDULE OF MERGER AND ACQUISITION RELATED COSTS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Business Combinations [Abstract]
Acquisition and merger related expenses	$ 34.6	$ 7.6
Integration costs	$ 16.6	$ 6.6

XML

ACQUISITIONS - NARRATIVE (Details) € in Millions, $ in Millions							3 Months Ended
	Jan. 13, 2021 USD ($) communicationSite	Jan. 13, 2021 EUR (€) communicationSite	Dec. 23, 2020 USD ($) network communicationSite landParcel tower	Dec. 31, 2019 USD ($) communicationSite	Nov. 28, 2019 USD ($) communicationSite	Nov. 28, 2019 EUR (€) communicationSite	Mar. 31, 2021 USD ($) communicationSite	Apr. 29, 2021 communicationSite	Dec. 31, 2020 USD ($) communicationSite	Dec. 19, 2019 communicationSite
Business Acquisition [Line Items]
Payment received related to acquisition							$ 4.0
Estimated aggregate impact of acquisitions completed, revenue							0.5
Estimated aggregate impact of acquisitions completed, gross margin							0.4
Accounts payable							130.1		$ 139.1
Telxius Telecom S.A.
Business Acquisition [Line Items]
Number of communications sites acquired (in number of towers) | communicationSite	31,000	31,000
Consideration transferred	$ 9,400.0	€ 7,700.0
Insite Acquisition
Business Acquisition [Line Items]
Number of communications sites acquired (in number of towers) | communicationSite			3,000
Percentage of interests acquired			100.00%
Number of land parcels under communication sites | landParcel			600
Consideration transferred			$ 3,500.0
Adjustment to assets							3.1
Adjustment to liabilities							18.2
Increase to goodwill							21.3
Insite Acquisition | U.S.
Business Acquisition [Line Items]
Number of broadcast and wireless communications towers | tower			1,400
Number of DAS networks | network			40
Number of rooftop sites | communicationSite			400
Insite Acquisition | CANADA
Business Acquisition [Line Items]
Number of broadcast and wireless communications towers | tower			200
Entel Acquisition
Business Acquisition [Line Items]
Number of communications sites acquired (in number of towers) | communicationSite										3,200
Aggregate purchase price				$ 800.0			$ 14.7
Entel Acquisition | Communication Sites
Business Acquisition [Line Items]
Number of communications sites acquired (in number of towers) | communicationSite				2,400			50		530
Other Acquisitions 2021 | Communication Sites
Business Acquisition [Line Items]
Number of communications sites acquired (in number of towers) | communicationSite							66
Aggregate purchase price							$ 62.5
Accounts payable							$ 4.0
Orange S.A. | Communication Sites
Business Acquisition [Line Items]
Number of communications sites acquired (in number of towers) | communicationSite					2,000	2,000	564
Purchase, period to be paid over					5 years	5 years
Orange S.A. | Communication Sites | Subsequent Event
Business Acquisition [Line Items]
Number of communications sites acquired (in number of towers) | communicationSite								81
Orange S.A. | Communication Sites | Minimum
Business Acquisition [Line Items]
Aggregate purchase price					$ 550.5	€ 500.0
Orange S.A. | Communication Sites | Maximum
Business Acquisition [Line Items]
Aggregate purchase price					$ 660.5	€ 600.0

XML

ACQUISITIONS - SUMMARY OF ALLOCATION OF THE PURCHASE PRICE (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) site	Dec. 31, 2020 USD ($)
Asset Acquisition:
Goodwill	$ 7,262.4	$ 7,282.7
Acquisitions 2021
Asset Acquisition:
Current assets	0.3
Property and equipment	22.5
Other non-current assets	5.8
Current liabilities	(1.0)
Deferred tax liability	0.0
Other non-current liabilities	(3.4)
Net assets acquired	77.2
Goodwill	0.0
Fair value of net assets acquired	77.2
Debt assumed	0.0
Purchase price	$ 77.2
Estimated Useful Lives (years)	20 years
Acquisitions 2021 | Peru
Asset Acquisition:
Number of sites acquired | site	12
Acquisitions 2021 | Tenant-related intangible assets
Asset Acquisition:
Intangible assets	$ 37.3
Acquisitions 2021 | Network location intangible assets
Asset Acquisition:
Intangible assets	15.7
Acquisitions 2021 | Other intangible assets
Asset Acquisition:
Intangible assets	$ 0.0

XML

ACQUISITIONS - PRO FORMA INFORMATION (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Business Combinations [Abstract]
Pro forma revenues	$ 2,158.9	$ 2,044.6
Pro forma net income attributable to American Tower Corporation common stockholders	$ 644.9	$ 369.8
Pro forma net income per common share amounts:
Basic net income attributable to American Tower Corporation common stockholders (in dollars per share)	$ 1.45	$ 0.83
Diluted net income attributable to American Tower Corporation common stockholders (in dollars per share)	$ 1.45	$ 0.83

XML

BUSINESS SEGMENTS (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	6
Segment revenues	$ 2,158.5	$ 1,993.1
Segment selling, general, administrative and development expense	182.6	217.8
OPERATING INCOME	828.7	736.8
Stock-based compensation expense	38.0	47.7
Depreciation, amortization and accretion	522.5	472.3
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	702.6	439.7
Total assets	46,942.5	40,789.1	$ 47,233.5
Operating Expense
Segment Reporting Information [Line Items]
Stock-based compensation expense		0.9
Selling, General and Administrative Expenses
Segment Reporting Information [Line Items]
Stock-based compensation expense	38.0	46.8
Operating Segments
Segment Reporting Information [Line Items]
Segment revenues	2,158.5	1,993.1
Segment operating expenses	574.3	551.1
Segment gross margin	1,584.2	1,442.0
Segment selling, general, administrative and development expense	98.4	127.3
OPERATING INCOME	1,485.8	1,314.7
Operating Segments | Property
Segment Reporting Information [Line Items]
Segment revenues	2,129.7	1,973.2
Segment operating expenses	563.3	543.5
Segment gross margin	1,566.4	1,429.7
Segment selling, general, administrative and development expense	94.2	123.8
OPERATING INCOME	1,472.2	1,305.9
Total assets	46,415.3	40,276.7
Operating Segments | Property, US
Segment Reporting Information [Line Items]
Segment revenues	1,231.3	1,089.9
Segment operating expenses	197.9	190.0
Segment gross margin	1,033.4	899.9
Segment selling, general, administrative and development expense	39.3	42.0
OPERATING INCOME	994.1	857.9
Total assets	27,331.9	22,486.9
Operating Segments | Property, Asia
Segment Reporting Information [Line Items]
Segment revenues	281.4	286.6
Segment operating expenses	175.5	164.0
Segment gross margin	105.9	122.6
Segment selling, general, administrative and development expense	7.1	32.6
OPERATING INCOME	98.8	90.0
Total assets	5,214.1	4,986.0
Operating Segments | Property, Africa
Segment Reporting Information [Line Items]
Segment revenues	235.7	225.5
Segment operating expenses	80.9	77.7
Segment gross margin	154.8	147.8
Segment selling, general, administrative and development expense	18.9	17.1
OPERATING INCOME	135.9	130.7
Total assets	4,905.4	4,510.3
Operating Segments | Property, Europe
Segment Reporting Information [Line Items]
Segment revenues	44.6	34.5
Segment operating expenses	7.8	6.6
Segment gross margin	36.8	27.9
Segment selling, general, administrative and development expense	5.6	5.5
OPERATING INCOME	31.2	22.4
Total assets	1,836.7	1,554.5
Operating Segments | Property, Latin America
Segment Reporting Information [Line Items]
Segment revenues	336.7	336.7
Segment operating expenses	101.2	105.2
Segment gross margin	235.5	231.5
Segment selling, general, administrative and development expense	23.3	26.6
OPERATING INCOME	212.2	204.9
Total assets	7,127.2	6,739.0
Operating Segments | Services
Segment Reporting Information [Line Items]
Segment revenues	28.8	19.9
Segment operating expenses	11.0	7.6
Segment gross margin	17.8	12.3
Segment selling, general, administrative and development expense	4.2	3.5
OPERATING INCOME	13.6	8.8
Total assets	59.4	29.0
Other
Segment Reporting Information [Line Items]
Segment selling, general, administrative and development expense	46.2	43.7
Stock-based compensation expense	38.0	47.7
Depreciation, amortization and accretion	522.5	472.3
Other expense	176.5	311.3
Total assets	$ 467.8	$ 483.4

XML

Label	Element	Value
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	$ 0
AOCI Attributable to Parent [Member]
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	142,200,000
Additional Paid-in Capital [Member]
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	$ (142,200,000)