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Accounts Payable And Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Schedule of Accounts Payable and Accrued Liabilities
Trade accounts payable and accrued liabilities consisted of the following:
 December 31,
(Millions of dollars)20202019
Trade accounts payable$261.0 $280.8 
Excise taxes/withholdings payable84.1 86.2 
Accrued insurance obligations30.3 24.4 
Accrued taxes other than income31.7 25.6 
Accrued compensation and benefits32.5 26.5 
Other31.5 22.7 
Accounts payable and accrued liabilities$471.1 $466.2