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Supplemental Quarterly Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Supplemental Quarterly Information
(Millions of dollars except per share amounts)
First
Quarter		Second
Quarter		Third
Quarter		Fourth
Quarter
Year 1,2
Year ended December 31, 2020     
Revenue from contracts with customers$600.6 285.7 425.3 440.1 1,751.7 
Income (loss) from continuing operations before income taxes(595.4)(417.9)(328.4)(207.3)(1,549.0)
Income (loss) from continuing operations(503.8)(323.1)(265.9)(162.5)(1,255.3)
Net income (loss) including noncontrolling interest(508.7)(324.4)(266.6)(162.7)(1,262.4)
Net income (loss) attributable to Murphy(416.1)(317.2)(243.5)(171.9)(1,148.8)
Income (loss) from continuing operations per Common share
Basic(2.68)(2.05)(1.58)(1.11)(7.43)
Diluted(2.68)(2.05)(1.58)(1.11)(7.43)
Net income (loss) per Common share
Basic(2.71)(2.06)(1.59)(1.11)(7.48)
Diluted(2.71)(2.06)(1.59)(1.11)(7.48)
Cash dividend per Common share0.25 0.125 0.125 0.125 0.625 
Year ended December 31, 2019
Revenue from contracts with customers$629.4 680.4 750.3 757.0 2,817.1 
Income (loss) from continuing operations before income taxes33.7 107.9 177.1 (115.3)203.5 
Income (loss) from continuing operations22.9 98.8 158.3 (91.3)188.8 
Net income including noncontrolling interest72.8 123.2 1,111.7 (54.4)1,253.3 
Net income attributable to Murphy40.2 92.3 1,089.0 (71.7)1,149.7 
Income (loss) from continuing operations per Common share
Basic(0.06)0.40 0.85 (0.71)0.52 
Diluted(0.06)0.40 0.84 (0.70)0.52 
Net income (loss) per Common share
Basic0.23 0.55 6.79 (0.71)7.01 
Diluted0.23 0.54 6.76 (0.47)6.98 
Cash dividend per Common share0.25 0.25 0.25 0.25 1.00 
1 Revenue from contracts with customers, Income (loss) from continuing operations before income taxes, Income (loss) from continuing operations and Net income (loss) including noncontrolling interest include results attributable to the noncontrolling interest in MP GOM.
2 2020 results include impairment charges of $1,206.3 million as a result of declines in future oil and natural gas prices at the time of impairment (principally driven by reduced demand in response to the COVID-19 pandemic - see Risk Factors).