Fair value measurement	9 Months Ended
Fair value measurement	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair value measurement	NOTE 12 — Fair value measurement We measure and record certain assets and liabilities at fair value. A fair value measurement is determined based on market assumptions that a market participant would use in pricing an asset or liability. A three-tiered hierarchy draws distinctions between market participant assumptions based on (i) observable inputs such as quoted prices in active markets (Level 1), (ii) inputs other than quoted active markets that are observable either directly or indirectly (Level 2), and (iii) unobservable inputs that require use of our own estimates and assumptions through present value and other valuation techniques in determination of fair value (Level 3). As of September 30, 2020 and December 31, 2019, assets and liabilities recorded at fair value and measured on a recurring basis primarily consist of pension plan assets. As permitted by U.S. GAAP, we use net asset values as a practical expedient to determine the fair value of certain investments. These investments measured at net asset value have not been classified in the fair value hierarchy. The Apollo Term Loan is recorded at carrying value, which approximates fair value, in the Condensed consolidated balance sheets and is classified as Level 3. We also have certain assets requiring fair value measurement on a non-recurring basis. Our assets measured on a non-recurring basis are assets held for sale, which are classified as Level 3 assets and evaluated using executed purchase agreements, letters of intent, or third-party valuation analyses when certain circumstances arise. Assets held for sale totaled $3.2 million as of September 30, 2020 and $25.5 million as of December 31, 2019.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.