XML 45 R35.htm IDEA: XBRL DOCUMENT
v3.25.2

FAIR VALUE MEASUREMENTS (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value Level of Inputs | 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.
Key assumptions used to apply this pricing model were as follows:
|  | 2025 |  | 2024
Expected term (years) |  | 2.81 |  | 2.81
Risk-free interest rate |  | 3.91 | % |  | 4.31 | %
Annualized volatility |  | 27.91 | % |  | 26.75 | %
Schedule of Fair Value of Assets and Liabilities Measured 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:
|  | June 30, 2025 |  | December 31, 2024
|  | Fair Value Measurements Using |  | Fair Value Measurements Using
|  | Level 1 |  | Level 2 |  | Level 3 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Investments in equity securities (1) |  | $ | 218.2 |  |  | $ | 4.0 |  |  | — |  |  | $ | 98.6 |  |  | $ | 5.3 |  |  | — |
_______________ (1)Investments in equity securities are recorded in Notes receivable and other non-current assets in the consolidated balance sheets at fair value. Unrealized holding gains and losses for equity securities are recorded in Other income (expense) in the consolidated statements of operations in the current period. During the three and six months ended June 30, 2025 and 2024, the Company recognized unrealized gains of $110.7 million, $40.7 million, $118.3 million and $26.0 million, respectively, for equity securities held as of June 30, 2025.
Schedule of Contractual Amounts of Outstanding Instruments | The following table presents the contractual amounts of the Company's outstanding instruments:
|  |  |  | As of
|  | Designation |  | June 30, 2025 |  | December 31, 2024
Foreign currency-denominated debt (1) |  | Net Investment Hedge |  | $ | 5,480.9 |  |  | $ | — |
_______________ (1)During the three and six months ended June 30, 2025, the Company recorded $204.6 million of unrealized foreign currency losses related to the EUR denominated debt that was designated as a net investment hedge as a foreign currency translation adjustment in Accumulated other comprehensive loss. As of June 30, 2025, includes 4.7 billion EUR ($5.5 billion) of outstanding EUR denominated debt designated as hedges of a portion the Company’s net investment in foreign operations. This debt matures in fiscal years 2026 through 2034.

X
- Definition Schedule Of Notional Amounts Of Outstanding Nonderivative Positions + References No definition available. + Details
Name: | amt_ScheduleOfNotionalAmountsOfOutstandingNonderivativePositionsTableTextBlock
Namespace Prefix: | amt_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration