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Other Financial Information | 12 Months Ended
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Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Other Financial Information | Other Financial Information CASH FLOW DISCLOSURES — Cash income taxes paid (collected), net of refunds, were $96.5 million, $26.9 million and $17.4 million for the three years ended December 31, 2020, 2019 and 2018, respectively. Interest paid, net of amounts capitalized, was $49.1 million, $56.6 million and $50.4 million for the years ended December 31, 2020, 2019 and 2018, respectively. CHANGES IN WORKING CAPITAL -
| Years ended December 31,
(Millions of dollars) | 2020 |  | 2019 |  | 2018
Accounts receivable | $ | 4.9 |  |  | $ | (33.4) |  |  | $ | 86.6 |
Inventories | (51.7) |  |  | (6.1) |  |  | (39.0) |
Prepaid expenses and other current assets | 16.6 |  |  | (3.3) |  |  | 11.4 |
Accounts payable and accrued liabilities | 8.3 |  |  | (5.9) |  |  | (56.7) |
Income taxes payable | 8.8 |  |  | — |  |  | — |
Net decrease (increase) in noncash operating working capital | $ | (13.1) |  |  | $ | (48.7) |  |  | $ | 2.3 |

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