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Other Financial Statement Data | 12 Months Ended
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Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract] |
Other Financial Statement Data | OTHER FINANCIAL STATEMENT DATA The following provides additional information concerning selected balance sheet accounts:
| December 31,
(in millions) | 2023 |  | 2022
Receivables |  |  |
Trade - External | $ | 940.9 |  |  | $ | 1,242.8 |
Trade - Affiliate | 194.6 |  |  | 249.6 |
Non-trade | 134.4 |  |  | 208.4 |
| 1,269.9 |  |  | 1,700.8 |
Less allowance for doubtful accounts | 0.7 |  |  | 0.9 |
| $ | 1,269.2 |  |  | $ | 1,699.9 |
Inventories |  |  |
Raw materials | $ | 135.8 |  |  | $ | 177.2 |
Work in process | 964.8 |  |  | 844.8 |
Finished goods | 1,178.0 |  |  | 2,158.3 |
Final price deferred (a) | 61.5 |  |  | 184.2 |
Operating materials and supplies | 183.1 |  |  | 178.6 |
| $ | 2,523.2 |  |  | $ | 3,543.1 |
Other current assets |  |  |
Income and other taxes receivable | $ | 269.3 |  |  | $ | 189.4 |
Prepaid expenses | 284.3 |  |  | 237.4 |
Assets held for sale | — |  |  | 101.9 |
Other | 50.2 |  |  | 49.5 |
| $ | 603.8 |  |  | $ | 578.2 |
Other assets |  |  |
Restricted cash | $ | 3.4 |  |  | $ | 10.5 |
MRO inventory | 166.3 |  |  | 141.9 |
Marketable securities held in trust - restricted | 708.6 |  |  | 666.0 |
Operating lease right-of-use assets | 229.8 |  |  | 182.5 |
Indemnification asset | 20.9 |  |  | 23.7 |
Long-term receivable | 21.8 |  |  | 26.9 |
Cloud computing cost (b) | 138.9 |  |  | 32.9 |
Other | 285.9 |  |  | 311.8 |
| $ | 1,575.6 |  |  | $ | 1,396.2 |
| December 31,
(in millions) | 2023 |  | 2022
Accrued liabilities |  |  |
Accrued dividends | $ | 72.3 |  |  | $ | 72.9 |
Payroll and employee benefits | 182.6 |  |  | 237.0 |
Asset retirement obligations | 377.4 |  |  | 212.3 |
Customer prepayments | 261.8 |  |  | 743.9 |
Accrued income and other taxes | 190.0 |  |  | 208.3 |
Operating lease obligation | 65.3 |  |  | 50.7 |
Other | 627.7 |  |  | 754.8 |
| $ | 1,777.1 |  |  | $ | 2,279.9 |
Other noncurrent liabilities |  |  |
Asset retirement obligations | $ | 1,836.0 |  |  | $ | 1,693.3 |
Operating lease obligation | 168.1 |  |  | 135.2 |
Accrued pension and postretirement benefits | 119.7 |  |  | 103.3 |
Unrecognized tax benefits | 30.5 |  |  | 32.5 |
Other | 274.9 |  |  | 271.7 |
| $ | 2,429.2 |  |  | $ | 2,236.0 |
______________________________ (a)Final price deferred is product that has shipped to customers, but we retain control and do not recognize revenue until a sales contract has been agreed to with the customer. (b)Implementation costs eligible for capitalization related to cloud computing arrangements that are a service contract are recorded within Prepaid expenses and Other assets in the Consolidated Balance Sheets and amortized over the reasonably certain term of the associated hosting arrangement. Capitalized implementation costs expensed were not material in 2023. Interest expense, net was comprised of the following in 2023, 2022 and 2021:
| Years Ended December 31,
(in millions) | 2023 |  | 2022 |  | 2021
Interest income | $ | 59.6 |  |  | $ | 31.0 |  |  | $ | 25.2 |
Less interest expense | 189.0 |  |  | 168.8 |  |  | 194.3 |
Interest expense, net | $ | (129.4) |  |  | $ | (137.8) |  |  | $ | (169.1) |

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