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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Fair Value Measurements | FAIR VALUE MEASUREMENTS Following is a summary of the valuation techniques for assets and liabilities recorded in our Consolidated Balance Sheets at fair value on a recurring basis: Foreign Currency Derivatives—The foreign currency derivative instruments that we currently use are forward contracts and zero-cost collars, which typically expire within eighteen months, however derivative instruments used to hedge anticipated cash flows related to our Esterhazy K3 expansion project expire within a period of thirty six months. Most of the valuations are adjusted by a forward yield curve or interest rates. In such cases, these derivative contracts are classified within Level 2. Some valuations are based on exchange-quoted prices, which are classified as Level 1. Changes in the fair market values of these contracts are recognized in the Consolidated Financial Statements as a component of cost of goods sold in our Corporate, Eliminations and Other segment or foreign currency transaction (gain) loss. As of December 31, 2020 and 2019, the gross asset position of our foreign currency derivative instruments was $58.6 million and $15.6 million, respectively, and the gross liability position of our foreign currency derivative instruments was $48.7 million and $22.9 million, respectively. Commodity Derivatives—The commodity contracts primarily relate to natural gas. The commodity derivative instruments that we currently use are forward purchase contracts, swaps and three-way collars. The natural gas contracts settle using NYMEX futures or AECO price indexes, which represent fair value at any given time. The contracts’ maturities and settlements are scheduled for future months and settlements are scheduled to coincide with anticipated gas purchases during those future periods. Quoted market prices from NYMEX and AECO are used to determine the fair value of these instruments. These market prices are adjusted by a forward yield curve and are classified within Level 2. Changes in the fair market values of these contracts are recognized in the Consolidated Financial Statements as a component of cost of goods sold in our Corporate, Eliminations and Other segment. As of December 31, 2020 and 2019, the gross asset position of our commodity derivative instruments was $6.7 million and $2.9 million, respectively, and the gross liability position of our commodity derivative instruments was $1.2 million and $6.2 million, respectively. Interest Rate Derivatives—We manage interest expense through interest rate contracts to convert a portion of our fixed-rate debt into floating-rate debt. From time to time, we also enter into interest rate swap agreements to hedge our exposure to changes in future interest rates related to anticipated debt issuances. Valuations are based on external pricing sources and are classified as Level 2. Changes in the fair market values of these contracts are recognized in the Consolidated Financial Statements as a component of interest expense. In April 2020, we terminated our outstanding interest rate swap contracts which resulted in an immaterial impact to our Consolidated Statement of Earnings (Loss). As of December 31, 2020 and 2019, the gross asset position of our interest rate swap instruments was zero and $11.4 million, respectively. The gross liability position of our interest rate swap instruments was zero as of the years ended December 31, 2020, and 2019. Financial Instruments The carrying amounts and estimated fair values of our financial instruments are as follows:
| December 31,
| 2020 |  | 2019
| Carrying |  | Fair |  | Carrying |  | Fair
(in millions) | Amount |  | Value |  | Amount |  | Value
Cash and cash equivalents | $ | 574.0 |  |  | $ | 574.0 |  |  | $ | 519.1 |  |  | $ | 519.1 |
Accounts receivable | 881.1 |  |  | 881.1 |  |  | 803.9 |  |  | 803.9 |
Accounts payable | 769.1 |  |  | 769.1 |  |  | 680.4 |  |  | 680.4 |
Structured accounts payable arrangements | 640.0 |  |  | 640.0 |  |  | 740.6 |  |  | 740.6 |
Short-term debt | 0.1 |  |  | 0.1 |  |  | 41.6 |  |  | 41.6 |
Long-term debt, including current portion | 4,578.0 |  |  | 5,172.1 |  |  | 4,572.7 |  |  | 4,920.9 |
For cash and cash equivalents, accounts receivable, net, accounts payable, structured accounts payable arrangements and short-term debt, the carrying amount approximates fair value because of the short-term maturity of those instruments. The fair value of long-term debt, including the current portion, is estimated using quoted market prices for the publicly registered notes and debentures, classified as Level 1 and Level 2, respectively, within the fair value hierarchy, depending on the market liquidity of the debt. For information regarding the fair value of our marketable securities held in trusts, see Note 13 of our Notes to Consolidated Financial Statements.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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