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Other Financial Information | 6 Months Ended
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Jun. 30, 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 $15.5 million and $6.5 million for the six month periods ended June 30, 2020 and 2019, respectively. Interest paid, net of amounts capitalized, was $25.4 million and $25.5 million for the six month periods ended June 30, 2020 and 2019, respectively. CHANGES IN WORKING CAPITAL:
| Six Months Ended June 30, |  |
(Millions of dollars) | 2020 |  | 2019
Accounts receivable | $ | 12.4 |  |  | $ | (97.5) |
Inventories | (30.3) |  |  | 10.2 |
Prepaid expenses and other current assets | 12.4 |  |  | (4.6) |
Accounts payable and accrued liabilities | (12.1) |  |  | 91.4 |
Income taxes payable | 40.8 |  |  | — |
Net (increase) decrease in noncash operating working capital | $ | 23.2 |  |  | $ | (0.5) |

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