Other Financial Information (Tables)

12 Months Ended

Dec. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Changes in Working Capital

CHANGES IN WORKING CAPITAL:

	Years ended December 31,
(Millions of dollars)	2025		2024		2023
Accounts receivable	$	(8.1)	$	65.4	$	(56.3)
Inventories	(11.4)		(60.2)		(22.1)
Prepaid expenses and other current assets	3.6		(3.1)		25.2
Accounts payable and accrued liabilities	(4.3)		(3.9)		(12.0)
Income taxes payable	(12.9)		34.6		23.1
Net (increase) decrease in noncash operating working capital	$	(33.1)	$	32.8	$	(42.1)