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Other Financial Statement Data | 12 Months Ended
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Dec. 31, 2018
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) | 2018 |  | 2017
Receivables |  |  |
Trade | $ | 703.7 |  |  | $ | 563.6 |
Non-trade | 136.1 |  |  | 81.3 |
| 839.8 |  |  | 644.9 |
Less allowance for doubtful accounts | 1.3 |  |  | 2.3 |
| $ | 838.5 |  |  | $ | 642.6 |
Inventories |  |  |
Raw materials | $ | 147.5 |  |  | $ | 37.8 |
Work in process | 625.5 |  |  | 349.9 |
Finished goods | 1,343.8 |  |  | 1,035.1 |
Final price deferred (a) | 39.3 |  |  | 38.6 |
Operating materials and supplies | 114.1 |  |  | 85.8 |
| $ | 2,270.2 |  |  | $ | 1,547.2 |
Other current assets |  |  |
Income and other taxes receivable | $ | 149.2 |  |  | $ | 141.3 |
Prepaid expenses | 86.8 |  |  | 69.0 |
Other | 44.6 |  |  | 62.9 |
| $ | 280.6 |  |  | $ | 273.2 |
Other assets |  |  |
Restricted cash | $ | 15.8 |  |  | $ | 32.6 |
MRO inventory | 134.6 |  |  | 114.8 |
Marketable securities held in trust - restricted | 632.3 |  |  | 628.0 |
Indemnification asset | 30.7 |  |  | — |
Long-term receivable | 91.7 |  |  | — |
Other | 352.7 |  |  | 492.1 |
| $ | 1,257.8 |  |  | $ | 1,267.5 |
| December 31,
(in millions) | 2018 |  | 2017
Accrued liabilities |  |  |
Accrued dividends | $ | 11.8 |  |  | $ | 12.1 |
Payroll and employee benefits | 217.5 |  |  | 159.5 |
Asset retirement obligations | 136.3 |  |  | 98.1 |
Customer prepayments | 199.8 |  |  | 140.4 |
Accrued income tax | 65.5 |  |  | 1.4 |
Other | 461.6 |  |  | 342.9 |
| $ | 1,092.5 |  |  | $ | 754.4 |
Other noncurrent liabilities |  |  |
Asset retirement obligations | $ | 1,023.8 |  |  | $ | 761.2 |
Accrued pension and postretirement benefits | 146.3 |  |  | 53.7 |
Unrecognized tax benefits | 33.0 |  |  | 33.5 |
Other | 255.6 |  |  | 119.4 |
| $ | 1,458.7 |  |  | $ | 967.8 |
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(a) | Final price deferred is product that has shipped to customers, but the price has not yet been agreed upon.
Interest expense, net was comprised of the following in 2018, 2017 and 2016:
| Years Ended December 31,
(in millions) | 2018 |  | 2017 |  | 2016
Interest income | $ | 49.7 |  |  | $ | 33.2 |  |  | $ | 28.2 |
Less interest expense | 215.8 |  |  | 171.3 |  |  | 140.6 |
Interest expense, net | $ | (166.1 | ) |  | $ | (138.1 | ) |  | $ | (112.4 | )

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