Other Financial Information (Tables)

9 Months Ended

Sep. 30, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Changes in Operating Working Capital

CHANGES IN WORKING CAPITAL:

	Nine Months Ended September 30,
(Millions of dollars)	2020		2019
Accounts receivable	$	31.0	$	(25.4)
Inventories	(40.6)		(12.3)
Prepaid expenses and other current assets	15.3		6.8
Accounts payable and accrued liabilities	(27.3)		27.2
Income taxes payable	19.4		—
Net (increase) decrease in noncash operating working capital	$	(2.2)	$	(3.7)