v3.26.3
Business Segments (Tables)
 9 Months Ended
Sep. 30, 2026
Segment Reporting [Abstract]  
Schedule of Segment Information
Exploration and Production
(Millions of dollars)
United
States 1
CanadaOtherTotal
E&P
Corporate and Discontinued Operations
Consolidated
Total
Three Months Ended September 30, 2026
Revenue from production
$680.2 $169.0 $— $849.2 $— $849.2 
Gain on sale of assets and other operating income
1.5 0.5 — 2.0 3.7 5.7 
Total revenues and other income
681.7 169.5 — 851.2 3.7 854.9 
Lease operating expenses
Lease operating expenses and taxes other than income
86.6 42.6 0.1 129.3 — 129.3 
Repair and maintenance
17.8 5.4 — 23.2 — 23.2 
Workovers(4.9)1.6 — (3.3)— (3.3)
Total lease operating expenses
99.5 49.6 0.1 149.2 — 149.2 
Severance and ad valorem taxes12.7 0.9 — 13.6 — 13.6 
Transportation, gathering and processing23.4 23.7 — 47.1 — 47.1 
Selling and general expenses7.7 7.5 2.6 17.8 22.8 40.6 
Exploration Expenses
Geological and geophysical2.0 — 15.6 17.6 — 17.6 
Dry holes and previously suspended exploration costs
0.9 — 5.2 6.1 — 6.1 
Other exploratory costs, including undeveloped lease amortization and delay lease rentals
5.3 — 4.1 9.4 — 9.4 
Total exploration expenses8.2 — 24.9 33.1 — 33.1 
Depreciation, depletion and amortization229.3 39.4 0.1 268.8 2.6 271.4 
Accretion of asset retirement obligations12.1 2.7 0.2 15.0 — 15.0 
Other operating expenses
11.3 17.1 0.3 28.7 (0.1)28.6 
Interest Income(0.7)— — (0.7)(2.2)(2.9)
Interest expense, net of capitalization
0.1 0.1 — 0.2 24.0 24.2 
Income tax expense
Current income tax expense(0.6)(1.0)(0.1)(1.7)(1.9)(3.6)
Deferred income tax expense (benefit)
55.5 8.3 (12.7)51.1 (8.2)42.9 
Total income tax expense (benefit)
54.9 7.3 (12.8)49.4 (10.1)39.3 
Other segment costs (income)
0.8 0.3 0.7 1.8 (1.6)0.2 
Segment income (loss) - including NCI 1
$222.4 $20.9 $(16.1)$227.2 $(31.7)$195.5 
Additions to property, plant, equipment$219.9 $21.2 $164.0 $405.1 $10.8 $415.9 
Total assets at quarter-end6,859.4 1,951.2 1,076.6 9,887.2 594.210,481.4 
1 Includes results attributable to a noncontrolling interest in MP GOM.
Exploration and Production
(Millions of dollars)
United
States 1
CanadaOtherTotal
E&P		Corporate and Discontinued OperationsConsolidated
Total
Three Months Ended September 30, 2025
Revenue from production
$613.4 $107.5 $0.1 $721.0 $— $721.0 
Gain on sale of assets and other operating income0.3 0.5 — 0.8 11.4 12.2 
Total revenues and other income613.7 108.0 0.1 721.8 11.4 733.2 
Lease operating expenses
Lease operating expenses and taxes other than income
95.6 41.2 0.4 137.2 — 137.2 
Repair and maintenance
13.9 1.4 — 15.3 — 15.3 
Workovers31.8 0.1 — 31.9 — 31.9 
Total lease operating expenses
141.3 42.7 0.4 184.4 — 184.4 
Severance and ad valorem taxes11.9 0.4 — 12.3 — 12.3 
Transportation, gathering and processing23.3 24.8 — 48.1 — 48.1 
Selling and general expenses1.9 5.4 2.2 9.5 21.4 30.9 
Exploration Expenses
— 
Geological and geophysical19.1 0.1 1.1 20.3 — 20.3 
Dry holes and previously suspended exploration costs
(0.1)— 0.9 0.8 — 0.8 
Other exploratory costs, including undeveloped lease amortization and delay lease rentals
3.5 0.1 7.8 11.4 — 11.4 
Total exploration expenses22.5 0.2 9.8 32.5 — 32.5 
Depreciation, depletion and amortization242.1 39.3 — 281.4 2.1 283.5 
Impairment of assets115.0 — — 115.0 — 115.0 
Accretion of asset retirement obligations11.8 2.6 0.2 14.6 0.1 14.7 
Other operating expenses
5.7 0.1 0.2 6.0 (0.1)5.9 
Interest income
(0.4)— — (0.4)(2.7)(3.1)
Interest expense, net of capitalization— 0.1 — 0.1 24.6 24.7 
Income tax expense
Current income tax expense (benefit)
1.0 (1.7)— (0.7)2.8 2.1 
Deferred income tax expense (benefit)
7.9 (0.2)(0.4)7.3 (5.2)2.1 
Total income tax expense (benefit)
8.9 (1.9)(0.4)6.6 (2.4)4.2 
Other segment costs (income)0.8 0.4 (0.3)0.9 (12.5)(11.6)
Segment income (loss) - including NCI 1
$28.9 $(6.1)$(12.0)$10.8 $(19.1)$(8.3)
Additions to property, plant, equipment$111.6 $26.0 $41.1 $178.7 $2.3 $181.0 
Total assets at quarter-end
6,848.1 1,981.8 411.8 9,241.7 491.1 9,732.8 
1 Includes results attributable to a noncontrolling interest in MP GOM.
Exploration and Production
(Millions of dollars)
United
States 1
CanadaOtherTotal
E&P
Corporate and Discontinued Operations
Consolidated
Total
Nine Months Ended September 30, 2026
Revenue from production
$1,997.9 $507.1 $2.9 $2,507.9 $— $2,507.9 
Gain on sale of assets and other operating income
3.3 1.2 — 4.5 4.4 8.9 
Total revenues and other income
2,001.2 508.3 2.9 2,512.4 4.4 2,516.8 
Lease operating expenses
Lease operating expenses and taxes other than income237.1 129.7 1.2 368.0 — 368.0 
Repair and maintenance47.9 6.8 — 54.7 — 54.7 
Workovers5.8 7.9 — 13.7 — 13.7 
Total lease operating expenses
290.8 144.4 1.2 436.4 — 436.4 
Severance and ad valorem taxes39.7 2.6 — 42.3 — 42.3 
Transportation, gathering and processing73.1 66.3 — 139.4 — 139.4 
Selling and general expenses20.8 22.0 7.3 50.1 64.0 114.1 
Exploration Expenses
Geological and geophysical13.0 — 17.4 30.4 — 30.4 
Dry holes and previously suspended exploration costs
0.5 — 86.2 86.7 — 86.7 
Other exploratory costs, including undeveloped lease amortization and delay lease rentals
15.2 — 22.9 38.1 — 38.1 
Total exploration expenses28.7 — 126.5 155.2 — 155.2 
Depreciation, depletion and amortization666.7 112.6 1.2 780.5 7.4 787.9 
Accretion of asset retirement obligations35.6 8.0 0.6 44.2 0.2 44.4 
Other operating expenses
31.7 17.2 0.9 49.8 (2.1)47.7 
Interest Income(1.5)— — (1.5)(6.8)(8.3)
Interest expense, net of capitalization0.3 0.1 0.1 0.5 77.6 78.1 
Income tax expense
Current income tax expense2.3 23.2 0.2 25.7 5.2 30.9 
Deferred income tax expense (benefit)156.9 6.7 (7.6)156.0 (20.6)135.4 
Total income tax expense (benefit)159.2 29.9 (7.4)181.7 (15.4)166.3 
Other segment costs (income)2.8 0.8 1.4 5.0 (19.4)(14.4)
Segment income (loss) - including NCI 1
$653.3 $104.4 $(128.9)$628.8 $(101.1)$527.7 
Additions to property, plant, equipment$737.9 $147.6 $364.1 $1,249.6 $27.2 $1,276.8 
Total assets at quarter-end6,859.4 1,951.2 1,076.6 9,887.2 594.210,481.4 
1 Includes results attributable to a noncontrolling interest in MP GOM.
Exploration and Production
(Millions of dollars)
United
States 1
CanadaOtherTotal
E&P
Corporate and Discontinued Operations
Consolidated
Total
Nine Months Ended September 30, 2025
Revenue from production
$1,673.1 $400.7 $3.0 $2,076.8 $— $2,076.8 
Gain on sale of assets and other operating income 3.6 1.3 — 4.9 15.0 19.9 
Total revenues and other income
1,676.7 402.0 3.0 2,081.7 15.0 2,096.7 
Lease operating expenses
Lease operating expenses and taxes other than income
295.9 133.1 1.6 430.6 — 430.6 
Repair and maintenance
38.0 4.0 — 42.0 — 42.0 
Workovers131.5 0.9 — 132.4 — 132.4 
Total lease operating expenses
465.4 138.0 1.6 605.0 — 605.0 
Severance and ad valorem taxes30.7 1.1 — 31.8 — 31.8 
Transportation, gathering and processing82.4 68.7 — 151.1 — 151.1 
Selling and general expenses8.7 17.1 6.7 32.5 66.2 98.7 
Exploration Expenses
Geological and geophysical23.0 0.1 1.6 24.7 — 24.7 
Dry holes and previously suspended exploration costs
(0.9)— 1.0 0.1 — 0.1 
Other exploratory costs, including undeveloped lease amortization and delay lease rentals
9.8 0.2 22.6 32.6 — 32.6 
Total exploration expenses31.9 0.3 25.2 57.4 — 57.4 
Depreciation, depletion and amortization619.7 109.8 1.2 730.7 6.2 736.9 
Impairment of assets115.0 — — 115.0 — 115.0 
Accretion of asset retirement obligations34.8 7.7 0.6 43.1 0.1 43.2 
Other operating expenses9.7 1.8 (1.1)10.4 3.0 13.4 
Interest Income(1.3)— — (1.3)(8.7)(10.0)
Interest expense, net of capitalization
— 0.1 0.1 0.2 73.1 73.3 
Income tax expense
Current income tax expense (benefit)2.2 12.3 0.2 14.7 (0.1)14.6 
Deferred income tax expense (benefit)
51.6 (1.8)(1.1)48.7 (25.4)23.3 
Total income tax expense (benefit)
53.8 10.5 (0.9)63.4 (25.5)37.9 
Other segment costs
2.6 1.1 — 3.7 23.1 26.8 
Segment income (loss) - including NCI 1
$223.3 $45.8 $(30.4)$238.7 $(122.5)$116.2 
Additions to property, plant, equipment$586.4 $127.0 $94.4 $807.8 $9.2 $817.0 
Total assets at quarter-end
6,848.1 1,981.8 411.8 9,241.7 491.1 9,732.8 
1 Includes results attributable to a noncontrolling interest in MP GOM.