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Other Financial Information (Tables) | 6 Months Ended
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Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Summary of Changes in Operating Working Capital | 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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- Definition Tabular disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities. + References No definition available. + Details
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