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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Fair Value Measurements | (10) FAIR VALUE MEASUREMENTS Recurring Fair Value Measurements Derivatives Valuation methodologies for our derivatives are detailed within Note 1. The following tables set forth, by level within the fair value hierarchy, our gross assets and gross liabilities and related offsetting as permitted by GAAP that were accounted for at fair value on a recurring basis for derivative instruments.
| As of December 31, 2023 |
| Level 1 |  | Level 2 |  | Level 3 |  | Cash Collateral and Counterparty Netting (a) |  | Total |
| (in millions) |
Assets: |  |  |  |  |  |  |  |  |  |
Commodity derivatives | $ | — |  | $ | 1.9 |  | $ | — |  | $ | (1.9 | ) | $ | — |
Total | $ | — |  | $ | 1.9 |  | $ | — |  | $ | (1.9 | ) | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |
Commodity derivatives | $ | — |  | $ | 10.1 |  | $ | — |  | $ | (3.3 | ) | $ | 6.8 |
Total | $ | — |  | $ | 10.1 |  | $ | — |  | $ | (3.3 | ) | $ | 6.8 |
(a) As of December 31, 2023, $1.9 million of our commodity derivative gross assets and $3.3 million of o ur commodity derivative gross liabilities, as well as related gross collateral amounts, were subject to master netting agreements.
| As of December 31, 2022 |
| Level 1 |  | Level 2 |  | Level 3 |  | Cash Collateral and Counterparty Netting (a) |  | Total |
| (in millions) |
Assets: |  |  |  |  |  |  |  |  |  |
Commodity derivatives | $ | — |  | $ | 5.4 |  | $ | — |  | $ | (4.3 | ) | $ | 1.1 |
Total | $ | — |  | $ | 5.4 |  | $ | — |  | $ | (4.3 | ) | $ | 1.1 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Commodity derivatives | $ | — |  | $ | 11.4 |  | $ | — |  | $ | (4.8 | ) | $ | 6.6 |
Total | $ | — |  | $ | 11.4 |  | $ | — |  | $ | (4.8 | ) | $ | 6.6 |
(a) As of December 31, 2022, $4.3 million of our commodity derivative assets and $4.8 million of our commodity derivative liabilities, as well as related gross collateral amounts, were subject to master netting agreements. Pension and Postretirement Plan Assets A discussion of the fair value of our Pension and Postretirement Plan assets is included in Note 13. Other Fair Value Measurements The carrying amount of cash and cash equivalents, restricted cash and equivalents and short-term borrowings approximates fair value due to their liquid or short-term nature. Cash, cash equivalents and restricted cash are classified in Level 1 in the fair value hierarchy. Notes payable consist of commercial paper borrowings and are not traded on an exchange; therefore, they are classified as Level 2 in the fair value hierarchy. The following table presents the carrying amounts and fair values of financial instruments not recorded at fair value on the Consolidated Balance Sheets at December 31 (in millions):
| 2023 |  | 2022 |
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value |
Long-term debt, including current maturities (a) | $ | 4,401.2 |  | $ | 4,215.6 |  | $ | 4,132.3 |  | $ | 3,760.8 |
(a) Long-term debt is valued based on observable inputs available either directly or indirectly for similar liabilities in active markets and therefore is classified in Level 2 in the fair value hierarchy. Carrying amount of long-term debt is net of deferred financing costs.

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- Definition The entire disclosure for derivatives and fair value of assets and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//815/tableOfContent Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//820/tableOfContent + Details
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