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FAIR VALUE MEASUREMENTS
9 Months Ended
Sep. 30, 2023
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 1Quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
Level 2Observable 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 3Unobservable 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:
 September 30, 2023December 31, 2022
 Fair Value Measurements UsingFair Value Measurements Using
 Level 1Level 2Level 3Level 1Level 2Level 3
Assets:
Investments in equity securities (1)$24.4 — — $29.2 — — 
VIL OCDs
— $192.7 — — — — 
Liabilities:
Interest rate swap agreements— — — — $6.2 — 
Fair value of debt related to interest rate swap agreements (2)— — — $(4.9)— — 
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(1)Investments in equity securities are recorded in Notes receivable and other non-current assets in the consolidated balance sheet 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 nine months ended September 30, 2023 and 2022, the Company recognized unrealized (losses) gains of $(4.2) million, $4.4 million, $(4.8) million and $(3.4) million, respectively, for equity securities held as of September 30, 2023.
(2)Included in the carrying values of the corresponding debt obligations as of December 31, 2022. As of September 30, 2023, the interest rate swap agreements under the 3.000% Notes were settled.

During the nine months ended September 30, 2023, the Company made no changes to the methods described in note 11 to its consolidated financial statements included in the 2022 Form 10-K that it used to measure the fair value of its interest rate swap agreements. In June 2023, the interest rate swap agreements with certain counterparties under the 3.000% Notes expired upon maturity of the underlying debt. As of September 30, 2023, there were no amounts outstanding under the interest rate swap agreements under the 3.000% Notes.
VIL Optionally Convertible Debentures—In February 2023, one of the Company’s customers in India, Vodafone Idea Limited (“VIL”), issued optionally convertible debentures (the “VIL OCDs”) to the Company’s subsidiary, ATC Telecom Infrastructure Private Limited (“ATC TIPL”), in exchange for VIL’s payment of certain amounts towards accounts receivables. The VIL OCDs are (a) to be repaid by VIL with interest, and (b) convertible, at ATC TIPL’s option, into equity of VIL. If converted, such equity shall be free to trade in the open market beginning on the one year anniversary of the date of issuance of the VIL OCDs. The VIL OCDs were issued for an aggregate face value of 16.0 billion INR (approximately $193.2 million on the date of issuance). The VIL OCDs were to mature in tranches with 8.0 billion INR (approximately $96.6 million on the date of issuance) maturing on August 27, 2023 and 8.0 billion INR (approximately $96.6 million on the date of issuance) maturing on August 27, 2024. In August 2023, the Company amended the agreements governing the VIL OCDs to, among other items, extend the maturity of the first tranche of the VIL OCDs to August 27, 2024. The fair value of the VIL OCDs at issuance was approximately $116.5 million. The VIL OCDs accrue interest at a rate of 11.2% annually. Interest is payable to ATC TIPL semi-annually, with the first payment received in September 2023.
The VIL OCDs are recorded in Prepaid and other current assets in the consolidated balance sheet at fair value. The significant input to the fair value of the VIL OCDs is the lesser of the (i) VIL equity share price underlying the instruments, less a liquidity discount, and (ii) redemption value. Unrealized holding gains and losses for the VIL OCDs are recorded in Other income (expense) in the consolidated statements of operations in the current period. During the three and nine months ended September 30, 2023, the Company recognized unrealized gains of $63.6 million and $76.7 million, respectively, for the VIL OCDs held as of September 30, 2023.
 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. There were no material long-lived asset impairments during the three and nine months ended September 30, 2023 or 2022 and there were no significant unobservable inputs used to determine the fair value of long-lived assets during the three and nine months ended September 30, 2023 or 2022.
The Company has undertaken a process to evaluate various strategic alternatives with respect to its India operations, which could include a sale of equity interests in its India operations. As part of this process, the Company has received indications of value from third parties, which are less than carrying value. The Company has incorporated this information as a significant input used to determine the fair value of the India reporting unit as of September 30, 2023. During the three and nine months ended September 30, 2023, the Company recorded goodwill impairments of $322.0 million, as discussed further in note 4.
There were no other items measured at fair value on a nonrecurring basis during the three and nine months ended September 30, 2023 or 2022.
Fair Value of Financial Instruments—The Company’s financial instruments for which the carrying value reasonably approximates fair value at September 30, 2023 and December 31, 2022 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 September 30, 2023 and December 31, 2022, the carrying value of long-term obligations, including the current portion, was $38.6 billion and $38.7 billion, respectively. As of September 30, 2023, the fair value of long-term obligations, including the current portion, was $34.8 billion, of which $28.1 billion was measured using Level 1 inputs and $6.7 billion was measured using Level 2 inputs. As of December 31, 2022, the fair value of long-term obligations, including the current portion, was $35.1 billion, of which $24.5 billion was measured using Level 1 inputs and $10.6 billion was measured using Level 2 inputs.