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Other Financial Information (Tables)

12 Months Ended

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Changes in Operating Working Capital

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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- 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.

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