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Schedule II - Valuation And Qualifying Accounts
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation And Qualifying Accounts
SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS
Murphy USA Inc.
Valuation Accounts and Reserves
 
(Millions of dollars)Balance at January 1,Charged (Credited) to ExpenseDeductionsBalance at December 31,
2020    
Deducted from assets accounts    
Allowance for doubtful accounts$1.2 — (1.1)$0.1 
2019    
Deducted from assets accounts    
Allowance for doubtful accounts$1.1 0.1 $1.2 
2018    
Deducted from assets accounts    
Allowance for doubtful accounts$1.1 0.5 (0.5)$1.1