The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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- Definition

Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

+ Details

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- Definition

Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

+ Details

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- Definition

Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 35
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

+ Details

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- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033

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ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance January 1	$ 674.1	$ 687.1
Revision in timing and/or estimates	249.3	(22.3)
Settlements	(18.4)	(17.8)
Accretion	36.9	27.1
Ending balance	941.9	674.1
Less: current portion	(40.2)	(71.3)
Asset retirement obligations	901.7	602.8
Evergy Kansas Central
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance January 1	272.9	281.1
Revision in timing and/or estimates	136.8	(12.4)
Settlements	(2.2)	(14.8)
Accretion	19.7	19.0
Ending balance	427.2	272.9
Less: current portion	(11.2)	(23.3)
Asset retirement obligations	416.0	249.6
Evergy Metro
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance January 1	253.6	261.0
Revision in timing and/or estimates	118.4	(9.9)
Settlements	(7.5)	(2.5)
Accretion	14.4	5.0
Ending balance	378.9	253.6
Less: current portion	(21.2)	(36.1)
Asset retirement obligations	$ 357.7	$ 217.5
Wolf Creek Unit
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Jointly owned utility plant, proportionate ownership share			94.00%	94.00%
Wolf Creek Unit \| Evergy Kansas Central
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Jointly owned utility plant, proportionate ownership share			47.00%
Wolf Creek Unit \| Evergy Metro
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Jointly owned utility plant, proportionate ownership share			47.00%	47.00%