v3.21.1
COVER - shares
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3 Months Ended |
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| Document Information [Line Items] |
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| Document Type |
10-Q
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| Document Quarterly Report |
true
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| Document Period End Date |
Mar. 31, 2021
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| Document Transition Report |
false
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| Entity File Number |
001-14195
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| Entity Registrant Name |
AMERICAN TOWER CORPORATION
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| Entity Incorporation, State or Country Code |
DE
|
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| Entity Tax Identification Number |
65-0723837
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| Entity Address, Address Line One |
116 Huntington Avenue
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| Entity Address, City or Town |
Boston
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| Entity Address, State or Province |
MA
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| Entity Address, Postal Zip Code |
02116
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| City Area Code |
617
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| Local Phone Number |
375-7500
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| Entity Current Reporting Status |
Yes
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| Entity Interactive Data Current |
Yes
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| Entity Filer Category |
Large Accelerated Filer
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| Entity Small Business |
false
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| Entity Emerging Growth Company |
false
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| Entity Shell Company |
false
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| Entity Common Stock, Shares Outstanding |
|
444,797,395
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| Entity Central Index Key |
0001053507
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| Current Fiscal Year End Date |
--12-31
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| Document Fiscal Year Focus |
2021
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| Document Fiscal Period Focus |
Q1
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| Amendment Flag |
false
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| Common Stock, $0.01 par value |
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| Document Information [Line Items] |
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| Title of 12(b) Security |
Common Stock, $0.01 par value
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| Trading Symbol |
AMT
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| Security Exchange Name |
NYSE
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| 1.375% Senior Notes due 2025 |
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| Document Information [Line Items] |
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| Title of 12(b) Security |
1.375% Senior Notes due 2025
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| Trading Symbol |
AMT 25A
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| Security Exchange Name |
NYSE
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| 1.950% Senior Notes due 2026 |
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| Document Information [Line Items] |
|
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| Title of 12(b) Security |
1.950% Senior Notes due 2026
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| Trading Symbol |
AMT 26B
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| Security Exchange Name |
NYSE
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| 0.500% Notes |
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| Document Information [Line Items] |
|
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| Title of 12(b) Security |
0.500% Senior Notes due 2028
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| Trading Symbol |
AMT 28A
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| Security Exchange Name |
NYSE
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| 1.000% Notes |
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| Document Information [Line Items] |
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| Title of 12(b) Security |
1.000% Senior Notes due 2032
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| Trading Symbol |
AMT 32
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| Security Exchange Name |
NYSE
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|
| X |
- DefinitionBoolean flag that is true when the XBRL content amends previously-filed or accepted submission.
| Name: |
dei_AmendmentFlag |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:booleanItemType |
| Balance Type: |
na |
| Period Type: |
duration |
|
| X |
- DefinitionEnd date of current fiscal year in the format --MM-DD.
| Name: |
dei_CurrentFiscalYearEndDate |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:gMonthDayItemType |
| Balance Type: |
na |
| Period Type: |
duration |
|
| X |
- DefinitionFiscal period values are FY, Q1, Q2, and Q3. 1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.
| Name: |
dei_DocumentFiscalPeriodFocus |
| Namespace Prefix: |
dei_ |
| Data Type: |
dei:fiscalPeriodItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionThis is focus fiscal year of the document report in YYYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.
| Name: |
dei_DocumentFiscalYearFocus |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:gYearItemType |
| Balance Type: |
na |
| Period Type: |
duration |
|
| X |
- DefinitionThe end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is YYYY-MM-DD.
| Name: |
dei_DocumentPeriodEndDate |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:dateItemType |
| Balance Type: |
na |
| Period Type: |
duration |
|
| X |
- DefinitionBoolean flag that is true only for a form used as an quarterly report. Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form 10-Q
-Number 240
-Section 308
-Subsection a
| Name: |
dei_DocumentQuarterlyReport |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:booleanItemType |
| Balance Type: |
na |
| Period Type: |
duration |
|
| X |
- DefinitionBoolean flag that is true only for a form used as a transition report. Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Forms 10-K, 10-Q, 20-F
-Number 240
-Section 13
-Subsection a-1
| Name: |
dei_DocumentTransitionReport |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:booleanItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionThe type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.
| Name: |
dei_DocumentType |
| Namespace Prefix: |
dei_ |
| Data Type: |
dei:submissionTypeItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionAddress Line 1 such as Attn, Building Name, Street Name
| Name: |
dei_EntityAddressAddressLine1 |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:normalizedStringItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- Definition
+ References
+ Details
| Name: |
dei_EntityAddressCityOrTown |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:normalizedStringItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionCode for the postal or zip code
| Name: |
dei_EntityAddressPostalZipCode |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:normalizedStringItemType |
| Balance Type: |
na |
| Period Type: |
duration |
|
| X |
- DefinitionName of the state or province.
| Name: |
dei_EntityAddressStateOrProvince |
| Namespace Prefix: |
dei_ |
| Data Type: |
dei:stateOrProvinceItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionA unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK. Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2
| Name: |
dei_EntityCentralIndexKey |
| Namespace Prefix: |
dei_ |
| Data Type: |
dei:centralIndexKeyItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionIndicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.
| Name: |
dei_EntityCommonStockSharesOutstanding |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:sharesItemType |
| Balance Type: |
na |
| Period Type: |
instant |
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| X |
- DefinitionIndicate 'Yes' or 'No' whether registrants (1) have 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 registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.
| Name: |
dei_EntityCurrentReportingStatus |
| Namespace Prefix: |
dei_ |
| Data Type: |
dei:yesNoItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionIndicate if registrant meets the emerging growth company criteria. Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2
| Name: |
dei_EntityEmergingGrowthCompany |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:booleanItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionCommission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.
| Name: |
dei_EntityFileNumber |
| Namespace Prefix: |
dei_ |
| Data Type: |
dei:fileNumberItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionIndicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure. Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2
| Name: |
dei_EntityFilerCategory |
| Namespace Prefix: |
dei_ |
| Data Type: |
dei:filerCategoryItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionTwo-character EDGAR code representing the state or country of incorporation.
| Name: |
dei_EntityIncorporationStateCountryCode |
| Namespace Prefix: |
dei_ |
| Data Type: |
dei:edgarStateCountryItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionBoolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-T
-Number 232
-Section 405
| Name: |
dei_EntityInteractiveDataCurrent |
| Namespace Prefix: |
dei_ |
| Data Type: |
dei:yesNoItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionThe exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC. Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2
| Name: |
dei_EntityRegistrantName |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:normalizedStringItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionBoolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act. Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2
| Name: |
dei_EntityShellCompany |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:booleanItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionIndicates that the company is a Smaller Reporting Company (SRC). Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2
| Name: |
dei_EntitySmallBusiness |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:booleanItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionThe Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS. Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2
| Name: |
dei_EntityTaxIdentificationNumber |
| Namespace Prefix: |
dei_ |
| Data Type: |
dei:employerIdItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionLocal phone number for entity.
| Name: |
dei_LocalPhoneNumber |
| Namespace Prefix: |
dei_ |
| Data Type: |
xbrli:normalizedStringItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- DefinitionTitle of a 12(b) registered security. Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b
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dei:securityTitleItemType |
| Balance Type: |
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| Period Type: |
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| X |
- DefinitionName of the Exchange on which a security is registered. Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection d1-1
| Name: |
dei_SecurityExchangeName |
| Namespace Prefix: |
dei_ |
| Data Type: |
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| Balance Type: |
na |
| Period Type: |
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| X |
- DefinitionTrading symbol of an instrument as listed on an exchange.
| Name: |
dei_TradingSymbol |
| Namespace Prefix: |
dei_ |
| Data Type: |
dei:tradingSymbolItemType |
| Balance Type: |
na |
| Period Type: |
duration |
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| X |
- Details
| Name: |
us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember |
| Namespace Prefix: |
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| Data Type: |
na |
| Balance Type: |
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| Period Type: |
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| X |
- Details
| Name: |
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| Namespace Prefix: |
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| Data Type: |
na |
| Balance Type: |
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| Period Type: |
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| X |
- Details
| Name: |
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| Namespace Prefix: |
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| Data Type: |
na |
| Balance Type: |
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| Period Type: |
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| X |
- Details
| Name: |
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| Namespace Prefix: |
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| Data Type: |
na |
| Balance Type: |
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| Period Type: |
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| X |
- Details
| Name: |
us-gaap_StatementClassOfStockAxis=amt_OnePointZeroZeroZeroPercentSeniorNotesDue2032Member |
| Namespace Prefix: |
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| Data Type: |
na |
| Balance Type: |
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| Period Type: |
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