FAIR VALUE MEASUREMENTS
The carrying values and estimated fair values of certain of our financial instruments were as follows (in millions):
December 31, 2025December 31, 2024
Carrying
Value
Estimated
  Fair
Value
Carrying
Value
Estimated
  Fair
Value
2030 Second Lien Notes (1)
$1,086.0 $1,144.9 $1,082.7 $1,112.7 
Notes Receivable from ARO (2)(3)
$345.0 $403.8 $296.2 $378.3 

(1)The estimated fair value of the 2030 Second Lien Notes (as defined in "Note 6 - Debt") was determined using quoted market prices, which are level 1 inputs.
(2)The estimated fair value of the Notes Receivable from ARO was estimated using an income approach to value the forecasted cash flows attributed to the Notes Receivable from ARO using a discount rate based on a comparable yield with a country-specific risk premium, which are considered to be level 2 inputs.
(3)The aggregate principal balance of the Notes Receivable from ARO as of December 31, 2025, includes an increase of $24.1 million related to paid in kind interest, which was applied to the principal balance on December 31, 2025. See "Note 3 - Equity Method Investment in ARO" for additional information.
The estimated fair values of our cash and cash equivalents, restricted cash, accounts receivable and trade payables approximated their carrying values as of December 31, 2025 and 2024.

Historical Timeline

Fiscal YearFiled
2025Feb 20, 2026Showing above
2024Feb 20, 2025
2023Feb 22, 2024
2022Feb 21, 2023
2021Feb 22, 2022
2020Mar 2, 2021
2019Feb 21, 2020
2018Feb 28, 2019
2017Feb 27, 2018
2016Feb 28, 2017
2015Feb 25, 2016

About Fair Value Disclosures

Fair value disclosures classify all assets and liabilities measured at fair value into a three-level hierarchy: Level 1 (quoted market prices), Level 2 (observable inputs like yield curves), and Level 3 (unobservable inputs requiring management estimates). The proportion of Level 3 assets directly reflects how much of the balance sheet depends on internal models rather than market evidence.

Key signals: a growing Level 3 balance relative to total fair-value assets increases valuation uncertainty and earnings volatility risk. Watch for transfers between levels — assets moving from Level 2 to Level 3 often signal deteriorating market liquidity. Unrealized gains and losses on Level 3 positions flow through earnings or other comprehensive income, so large swings deserve scrutiny. For financial institutions, examine the sensitivity disclosures that show how Level 3 valuations change under alternative assumptions. Compare the fair value of debt against its carrying amount to gauge hidden leverage.