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Other Financial Information (Tables)
3 Months Ended
Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Changes in Working Capital
CHANGES IN WORKING CAPITAL:
 Three Months Ended
March 31,
(Millions of dollars)20252024
Accounts receivable$(3.7)$(45.7)
Inventories37.2 48.6 
Prepaid expenses and other current assets1.1 (5.7)
Accounts payable and accrued liabilities2.9 (9.3)
Income taxes payable(37.2)16.3 
Net (increase) decrease in noncash operating working capital$0.3 $4.2