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Fair Value Measurements - Additional Information (Details) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) Derivative
Fair Value Disclosures [Abstract]
Estimated fair value of derivative instruments, net liability		$ (349.2)
Derivative fair value of net liability if commodity price increases by 10 percent		(475.9)
Derivative fair value of net liability if commodity price decreases by 10 percent		$ (222.5)
Derivative contracts categorized as Level 3 | Derivative		2
Non-cash pre-tax impairments	$ 2,442.8

X

- Definition

Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives if the commodity price decreases by 10 percent.

+ References

No definition available.

+ Details

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- Definition

Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives if the commodity price increases by 10 percent.

+ References

No definition available.

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- Definition

Number of derivative contracts categorized as level 3.

+ References

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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