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Other Financial Information
 3 Months Ended
Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Other Financial Information Other Financial Information
  
CASH FLOW DISCLOSURES — Interest paid, net of amounts capitalized, was $35.7 million and $30.0 million for the three-month periods ended March 31, 2026 and 2025, respectively.  

CHANGES IN WORKING CAPITAL:
 Three Months Ended
March 31,
(Millions of dollars)20262025
Accounts receivable$(78.0)$(3.7)
Inventories49.7 37.2 
Prepaid expenses and other current assets(5.2)1.1 
Accounts payable and accrued liabilities161.5 2.9 
Income taxes payable(32.9)(37.2)
Net (increase) decrease in noncash operating working capital$95.1 $0.3