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Other Financial Information (Tables)
3 Months Ended
Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Changes in Operating Working Capital
CHANGES IN WORKING CAPITAL:
 Three Months Ended
March 31,
(Millions of dollars)20212020
Accounts receivable$(5.3)$37.3 
Inventories20.5 (16.7)
Prepaid expenses and other current assets(3.3)13.7 
Accounts payable and accrued liabilities81.6 (66.1)
Income taxes payable14.5 6.1 
Net (increase) decrease in noncash operating working capital$108.0 $(25.7)