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Other Financial Information | 3 Months Ended
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Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Other Financial Information | Other Financial Information CASH FLOW DISCLOSURES — There were no cash income taxes paid, net of refunds and refunds of $0.5 million for the three month periods ended March 31, 2021 and 2020, respectively. Interest paid, net of amounts capitalized, was $18.4 million and $14.7 million for the three month periods ended March 31, 2021 and 2020, respectively. CHANGES IN WORKING CAPITAL:
| Three Months Ended March 31,
(Millions of dollars) | 2021 |  | 2020
Accounts receivable | $ | (5.3) |  |  | $ | 37.3 |
Inventories | 20.5 |  |  | (16.7) |
Prepaid expenses and other current assets | (3.3) |  |  | 13.7 |
Accounts payable and accrued liabilities | 81.6 |  |  | (66.1) |
Income taxes payable | 14.5 |  |  | 6.1 |
Net (increase) decrease in noncash operating working capital | $ | 108.0 |  |  | $ | (25.7) |

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