Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 10
-Subparagraph (d)(1)
-URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

Commitments and Contingencies - Environmental Matters (Details) T in Millions, $ in Millions	1 Months Ended				12 Months Ended	15 Months Ended
	Jan. 31, 2023 micrograms	Jun. 30, 2021 area	May 31, 2021	Dec. 31, 2020 micrograms performance_obligations	Dec. 31, 2022 USD ($) micrograms performance_obligations generating_units States MW T	Mar. 31, 2019 MW	Dec. 31, 2021 USD ($)
Manufactured Gas Plant Remediation
Regulatory asset \| $					$ 3,306.9		$ 3,367.1
Estimated future cash expenditures for environmental remediation \| $					499.6		532.6
Environmental remediation costs
Manufactured Gas Plant Remediation
Regulatory asset \| $					610.7		630.9
Estimated future cash expenditures for environmental remediation \| $					$ 499.6
Cross State Air Pollution Rule \| Electric
Air Quality
Number of states the EPA is proposing more stringent regulation of ozone-season NOx emissions in \| States					26
Cross State Air Pollution Rule \| Electric \| Maximum
Air Quality
RICE unit megawatts \| MW					25
National Ambient Air Quality Standards \| Electric
Air Quality
Number of counties to have boundaries revised \| area		13
Number of nonattainment areas as designated by the EPA \| area		6
Number of revisions necessary to meet the 2012 standard for particulate matter \| performance_obligations				0
Current level of micrograms per cubic meter that particulate matter needs to be below				12
Current level of micrograms per cubic meter under 24-hour standard that particulate matter needs to be below				35
Lowest limit that will cause nonattainment					10
National Ambient Air Quality Standards \| Electric \| Minimum
Air Quality
The EPA is taking comments on this full range of micrograms per cubic meter					8
New possible number of micrograms per cubic meter that particulate matter may be lowered to					10
National Ambient Air Quality Standards \| Electric \| Minimum \| Subsequent event
Air Quality
Proposed primary (health-based) annual standard	9
National Ambient Air Quality Standards \| Electric \| Maximum
Air Quality
The EPA is taking comments on this full range of micrograms per cubic meter					11
New possible number of micrograms per cubic meter that particulate matter may be lowered to					11
National Ambient Air Quality Standards \| Electric \| Maximum \| Subsequent event
Air Quality
Proposed primary (health-based) annual standard	10
Climate Change \| Electric
Air Quality
Capacity of coal generation retired since the beginning of 2018, in megawatts \| MW						1,800
Capacity of fossil-fueled generation to be retired by the end of 2026, in megawatts \| MW					1,600
Company goal for percentage carbon dioxide emission reduction goal by the end of 2025			60.00%
Company goal for percentage of carbon dioxide emissions reduction below 2005 levels by the end of 2030			80.00%
Carbon dioxide emissions \| T					19.5
Climate Change \| Natural gas
Air Quality
Carbon dioxide emissions \| T					29.3
Clean Water Act Cooling Water Intake Structure Rule \| Electric
Water Quality
Number of generating units that may be retired at OCPP \| generating_units					4
Steam Electric Effluent Guidelines \| Electric
Water Quality
Number of new ELG rule requirements that affect our electric utilities \| performance_obligations					2
Expected capital investment to be in compliance with ELG rule \| $					$ 100.0
Manufactured Gas Plant Remediation \| Natural gas
Manufactured Gas Plant Remediation
Estimated future cash expenditures for environmental remediation \| $					499.6		532.6
Manufactured Gas Plant Remediation \| Natural gas \| Environmental remediation costs
Manufactured Gas Plant Remediation
Regulatory asset \| $					$ 610.7		$ 630.9
Renewables, Efficiency, and Conservation \| Electric \| Wisconsin
Renewables, Efficiency, and Conservation
Annual state renewable portfolio requirement, as a percent					10.00%
Percent of annual operating revenues used to fund renewable program					1.20%
Renewables, Efficiency, and Conservation \| Electric \| Wisconsin \| WE
Renewables, Efficiency, and Conservation
Required renewable energy percent achieved					8.27%
Renewables, Efficiency, and Conservation \| Electric \| Wisconsin \| WPS
Renewables, Efficiency, and Conservation
Required renewable energy percent achieved					9.74%
Renewables, Efficiency, and Conservation \| Electric \| Michigan
Renewables, Efficiency, and Conservation
Annual state renewable portfolio requirement, as a percent					12.50%
Energy optimization target, as a percent					1.00%
Percentage renewable portfolio requirement 2021 and beyond					15.00%