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Business Segments (Tables)

9 Months Ended

Sep. 30, 2025

Segment Reporting [Abstract]

Schedule of Segment Information

			Exploration and Production
(Millions of dollars)			United States 1						Canada						Other						Total E&P																		Corporate, Other, and Discontinued Operations						Consolidated Total
Three Months Ended September 30, 2025
Revenue from production			$	613.4					$	107.5					$	0.1					$	721.0																	$	—					$	721.0
Gain on sales of assets and other operating income			0.3						0.5						—						0.8																		11.4						12.2
Revenues from external customers			613.7						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
Workovers			31.8						0.1						—						31.9																		—						31.9
Total lease operating expenses			141.3						42.7						0.4						184.4																		—						184.4
Severance and ad valorem taxes			11.9						0.4						—						12.3																		—						12.3
Transportation, gathering and processing			23.3						24.8						—						48.1																		—						48.1
Selling and general expenses			1.9						5.4						2.2						9.5																		21.4						30.9
Exploration Expenses
Geological and geophysical			19.1						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 expenses			22.5						0.2						9.8						32.5																		—						32.5
Depreciation, depletion and amortization			242.1						39.3						—						281.4																		2.1						283.5
Impairment of assets			115.0						—						—						115.0																		—						115.0
Accretion of asset retirement obligations			11.8						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						Canada						Other						Total E&P																		Corporate, Other, and Discontinued Operations						Consolidated Total
Three Months Ended September 30, 2024
Revenue from production			$	596.5					$	157.6					$	(0.8)					$	753.1																	$	—					$	753.1
Gain on sales of assets and other operating income			0.5						0.3						—						1.0																		4.2						5.2
Revenues from external customers			597.0						157.9						(0.8)						754.1																		4.2						758.3
Lease operating expenses
Lease operating expenses and taxes other than income			108.0						51.7						0.3						160.0																		—						160.0
Repair and maintenance			15.1						1.8						—						16.9																		—						16.9
Workovers			45.7						0.3						—						46.0																		—						46.0
Total lease operating expenses			168.8						53.8						0.3						222.9																		—						222.9
Severance and ad valorem taxes			10.1						0.3						—						10.5																		—						10.5
Transportation, gathering and processing			26.3						21.2						—						47.5																		—						47.5
Selling and general expenses			(1.7)						4.7						1.9						4.9																		20.0						24.9
Exploration Expenses																																													—
Geological and geophysical			9.9						0.1						2.8						12.8																		—						12.8
Dry holes and previously suspended exploration costs			10.8						—						0.4						11.2																		—						11.2
Other exploratory costs, including undeveloped lease amortization and delay lease rentals			2.5						0.2						4.7						7.3																		—						7.3
Total exploration expenses			23.2						0.3						7.9						31.3																		—						31.3
Depreciation, depletion and amortization			179.3						42.8						—						222.1																		1.5						223.6
Impairment of assets			—						—						—						—																		—						—
Accretion of asset retirement obligations			10.9						2.1						0.2						13.2																		—						13.2
Other operating expenses			4.8						0.1						0.5						5.4																		0.1						5.5
Interest income			(0.8)						—						—						(0.8)																		(3.1)						(3.9)
Interest expense, net of capitalization			0.3						—						—						0.3																		21.0						21.3
Income tax expense
Current income tax expense (benefit)			0.8						8.2						(0.1)						8.9																		2.1						11.0
Deferred income tax expense (benefit)			34.4						0.2						(34.0)						0.6																		(9.5)						(8.9)
Total income tax expense (benefit)			35.2						8.4						(34.1)						9.5																		(7.4)						2.1
Other segment costs (income)			1.8						—						0.1						1.9																		6.4						8.3
Segment income (loss) - including NCI 1			$	138.8					$	24.2					$	22.4					$	185.4																	$	(34.3)					$	151.1
Additions to property, plant, equipment			$	130.2					$	13.5					$	20.5					$	164.2																	$	8.0					$	172.2
Total assets at quarter-end			7,088.3						2,043.0						266.6						9,397.9																		318.5						9,716.4

1 Includes results attributable to a noncontrolling interest in MP GOM.

			Exploration and Production
(Millions of dollars)			United States 1						Canada						Other						Total E&P																		Corporate, Other, 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 sales of assets and other operating income			3.6						1.3						—						4.9																		15.0						19.9
Revenues from external customers			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
Workovers			131.5						0.9						—						132.4																		—						132.4
Total lease operating expenses			465.4						138.0						1.6						605.0																		—						605.0
Severance and ad valorem taxes			30.7						1.1						—						31.8																		—						31.8
Transportation, gathering and processing			82.4						68.7						—						151.1																		—						151.1
Selling and general expenses			8.7						17.1						6.7						32.5																		66.2						98.7
Exploration Expenses
Geological and geophysical			23.0						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 expenses			31.9						0.3						25.2						57.4																		—						57.4
Depreciation, depletion and amortization			619.7						109.8						1.2						730.7																		6.2						736.9
Impairment of assets			115.0						—						—						115.0																		—						115.0
Accretion of asset retirement obligations			34.8						7.7						0.6						43.1																		0.1						43.2
Other operating expenses			9.7						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 cost			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.

			Exploration and Production
(Millions of dollars)			United States 1						Canada						Other						Total E&P																		Corporate, Other, and Discontinued Operations						Consolidated Total
Nine Months Ended September 30, 2024
Revenue from production			$	1,933.0					$	408.9					$	3.4					$	2,345.3																	$	—					$	2,345.3
Sales of purchased natural gas			—						3.7						—						3.7																		—						3.7
Gain on sales of assets and other operating income			3.1						1.2						—						4.3																		4.2						8.5
Revenues from external customers			1,936.1						413.8						3.4						2,353.3																		4.2						2,357.5
Lease operating expenses
Lease operating expenses and taxes other than income			348.6						142.1						1.0						491.7																		—						491.7
Repair and maintenance			41.9						3.2						—						45.1																		—						45.1
Workovers			177.2						2.8						—						180.0																		—						180.0
Total lease operating expenses			567.7						148.1						1.0						716.8																		—						716.8
Severance and ad valorem taxes			29.9						1.1						—						31.0																		—						31.0
Transportation, gathering and processing			97.1						60.4						—						157.5																		—						157.5
Costs of purchased natural gas			—						3.1						—						3.1																		—						3.1
Selling and general expenses			(5.2)						14.2						4.9						13.9																		65.0						78.9
Exploration Expenses
Geological and geophysical			13.5						0.2						8.6						22.3																		—						22.3
Dry holes and previously suspended exploration costs			67.9						—						1.7						69.6																		—						69.6
Other exploratory costs, including undeveloped lease amortization and delay lease rentals			9.6						0.2						16.7						26.5																		—						26.5
Total exploration expenses			91.0						0.4						27.0						118.4																		—						118.4
Depreciation, depletion and amortization			528.3						114.1						0.9						643.3																		7.0						650.3
Impairment of assets			34.5						—						—						34.5																		—						34.5
Accretion of asset retirement obligations			32.0						6.4						0.6						39.0																		0.1						39.1
Other operating expenses			8.0						2.1						0.6						10.7																		(0.2)						10.5
Interest Income			(21.6)						—						—						(21.6)																		(8.6)						(30.2)
Interest expense, net of capitalization			0.3						0.2						0.1						0.6																		61.7						62.3
Income tax expense
Current income tax expense			2.9						10.5						0.2						13.6																		6.2						19.8
Deferred income tax expense (benefit)			106.9						0.7						(33.7)						73.9																		(28.8)						45.1
Total income tax expense (benefit)			109.8						11.2						(33.5)						87.5																		(22.6)						64.9
Other segment costs (income)			5.3						—						0.3						5.6																		(7.2)						(1.6)
Segment income (loss) - including NCI 1			$	459.0					$	52.5					$	1.5					$	513.0																	$	(91.0)					$	422.0
Additions to property, plant, equipment			$	511.3					$	122.9					$	44.6					$	678.8																	$	16.4					$	695.2
Total assets at quarter-end			7,088.3						2,043.0						266.6						9,397.9																		318.5						9,716.4

1 Includes results attributable to a noncontrolling interest in MP GOM.

X

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-25

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

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X

- References

No definition available.

+ Details

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