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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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://www.xbrl.org/2003/role/disclosureRef
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Amount of asset retirement obligations incurred during the period.

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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.

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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.

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

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

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No definition available.

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Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Changes to asset retirement obligations
Balance as of January 1	$ 462.0	$ 513.5	$ 483.5
Accretion	16.1	21.2	20.7
Additions and revisions to estimated cash flows	15.0	(53.9)	39.7
Liabilities settled	(13.8)	(18.8)	(30.4)
Balance as of December 31	479.3	462.0	513.5
Thunderhead \| Wind and solar generation projects
Changes to asset retirement obligations
ARO additions	12.1
PGL and NSG \| Natural gas distribution pipe
Changes to asset retirement obligations
ARO increase (decrease) due to revisions made to estimated cash flows	$ 1.9
PGL and NSG \| Natural gas distribution lines
Changes to asset retirement obligations
ARO additions		50.7
ARO increase (decrease) due to revisions made to estimated cash flows		(152.0)
WPS, Tatanka, and Jayhawk \| Wind and solar generation projects
Changes to asset retirement obligations
ARO additions		26.3
WE and WPS \| Wind and solar generation projects
Changes to asset retirement obligations
ARO increase (decrease) due to revisions made to estimated cash flows		7.8
WPS \| Fly ash landfills and ash ponds
Changes to asset retirement obligations
ARO increase (decrease) due to revisions made to estimated cash flows		$ 6.8
PGL \| Natural gas distribution lines
Changes to asset retirement obligations
ARO additions			39.3
Two Creeks \| Wind and solar generation projects
Changes to asset retirement obligations
ARO additions			8.5
WE \| Abatement of asbestos
Changes to asset retirement obligations
ARO increase (decrease) due to revisions made to estimated cash flows			$ (9.2)