XML 92 R82.htm IDEA: XBRL DOCUMENT
v3.25.3

NONCONTROLLING INTERESTS - Narrative (Details) € in Millions, $ in Millions | 1 Months Ended | 9 Months Ended | 48 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2022 | Sep. 30, 2025 USD ($) | Sep. 30, 2025 EUR (€) | Aug. 31, 2026 | Dec. 31, 2021
Stonepeak |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Dividends declared for common stock |  | $ 51.4 |  |  |
Preferred Stock | Stonepeak |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Accrued dividends |  | $ 11.6 |  |  |
U.S. | Data Centers |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Stock conversion period | 4 years |  |  |  |
U.S. | Data Centers | Common Stock |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Percentage of ownership after transaction (as a percent) |  | 71.00% | 71.00% |  |
U.S. | Data Centers | Common Stock | Forecast |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Percentage of ownership after transaction (as a percent) |  |  |  | 64.00% |
Kirtonkhola Tower Bangladesh Limited |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Percentage of interests acquired (as a percent) |  |  |  |  | 51.00%
Stonepeak | Preferred Stock |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Dividends declared |  | $ 34.5 |  |  |
AT Europe C.V. |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Dividends declared |  | 82.1 | € 70.9 |  |
AT Iberia C.V. |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Dividends declared |  | $ 101.1 | € 87.3 |  |
ATC Europe |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Controlling ownership interest percentage (as a percent) |  | 52.00% |  |  |
ATC Europe | CDPQ |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling owner ownership percentage (as a percent) |  | 30.00% |  |  |
ATC Europe | Allianz |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling owner ownership percentage (as a percent) |  | 18.00% |  |  |
France | ATC Europe |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Controlling ownership interest percentage (as a percent) |  | 100.00% |  |  |
Germany |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling owner ownership percentage (as a percent) |  | 13.00% |  |  |
Germany | ATC Europe |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Controlling ownership interest percentage (as a percent) |  | 87.00% |  |  |
Spain |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling owner ownership percentage (as a percent) |  | 17.00% |  |  |
Spain | ATC Europe |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Controlling ownership interest percentage (as a percent) |  | 83.00% |  |  |
Kirtonkhola Tower Bangladesh Limited | Confidence Group |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling owner ownership percentage (as a percent) |  |  |  |  | 49.00%
Stonepeak | U.S. | Data Centers |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Preferred stock, dividend rate (as a percent) |  | 5.00% | 5.00% |  |
Preferred stock, conversion ratio |  | 1 |  |  |
Stonepeak | U.S. | Data Centers | Common Stock |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling owner ownership percentage (as a percent) |  | 29.00% |  |  |
Stonepeak | U.S. | Data Centers | Common Stock | Forecast |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling owner ownership percentage (as a percent) |  |  |  | 36.00% |
Stonepeak | U.S. | Data Centers | Preferred Stock |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling owner ownership percentage (as a percent) |  | 100.00% |  |  |

X
- Definition Stock Conversion, Period + References No definition available. + Details
Name: | amt_StockConversionPeriod
Namespace Prefix: | amt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of voting equity interest acquired in business combination. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-8 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 38 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479303/805-10-55-38 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 + Details
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 2 -SubTopic 405 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477787/942-405-45-2 + Details
Name: | us-gaap_Dividends
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 2 -SubTopic 405 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477787/942-405-45-2 + Details
Name: | us-gaap_DividendsCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 405 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478790/946-405-45-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_DividendsPayableCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_MinorityInterestLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of common shares issuable upon conversion for each share of preferred stock to be converted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-13 + Details
Name: | us-gaap_PreferredStockConvertibleConversionRatio
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 + Details
Name: | us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CounterpartyNameAxis=amt_StonepeakPartnersLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=amt_PropertyDataCentersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=amt_KirtonkholaTowerBangladeshLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=amt_StonepeakPartnersLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=amt_ATCEuropeC.V.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=amt_ATIberiaCvMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=amt_ATCEuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=amt_CaisseDeDepotEtPlacementDuQuebecMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=amt_AllianzCapitalPartnersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=amt_SubsidiariesOperatingInFranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=amt_ATCEuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=amt_SubsidiariesOperatingInGermanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=amt_SubsidiariesOperatingInSpainMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=amt_KirtonkholaTowerBangladeshLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=amt_ConfidenceGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=amt_StonepeakPartnersLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |