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Other Financial Information
 3 Months Ended
Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Other Financial Information Other Financial Information
  
CASH FLOW DISCLOSURES — Cash income tax payments, net of refunds, were $41.7 million for the three-month periods ended March 31, 2025 and cash income taxes received were $0.1 million for the three-month periods ended March 31, 2024. Interest paid, net of amounts capitalized, was $30.0 million and $30.4 million for the three-month periods ended March 31, 2025 and 2024, respectively.  

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