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Commitments and Contingencies - Environmental Matters (Details) T in Millions, $ in Millions	1 Months Ended			12 Months Ended
	Sep. 30, 2019 Years	Apr. 30, 2019 degreecelsius	Dec. 31, 2018 USD ($) change	Dec. 31, 2019 USD ($) generating_units T MW	Dec. 31, 2018 USD ($) T
Mercury and Air Toxics | Electric
Air Quality
Revisions to mercury and air toxics standards | change			0
Climate Change | Electric
Air Quality
Number of states challenging the ACE rule | Years	22
Company goal for percentage of carbon dioxide emissions reductions by 2030				40.00%
Capacity of coal generation retired since the beginning of 2018 | MW				1,800
Per mile rate of methane emission reduction				30.00%
Carbon dioxide emissions | T				21.8	26.4
Climate Change | Electric | Maximum
Air Quality
Global temperature increases limit | degreecelsius		2
Climate Change | Natural gas
Air Quality
Carbon dioxide emissions | T				29.4	29.4
Steam Electric Effluent Guidelines | Electric
Water Quality
Total units of OCPP and ERGS | generating_units				6
Expected cost to achieve required discharge limits				$ 60.0
Manufactured Gas Plant Remediation | Natural gas
Manufactured Gas Plant Remediation
Regulatory assets recorded for remediation of manufactured gas plant sites			$ 687.1	685.5	$ 687.1
Reserves for future environmental remediation of manufactured gas plant sites			$ 616.4	$ 589.2	$ 616.4
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
State renewable portfolio requirement for years 2019 through 2020, as a percent				12.50%
Energy optimization target, as a percent				1.00%
State renewable portfolio requirement for 2021, as a percent				15.00%

X

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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