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Commitments and Contingencies - Environmental Matters (Details) T in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Jan. 31, 2016 | Dec. 31, 2015 USD ($) | Aug. 31, 2014 | Jun. 30, 2013 USD ($) | Mar. 31, 2013 USD ($) | Dec. 31, 2016 USD ($) T | Dec. 31, 2015 USD ($) T | Jun. 01, 2015 USD ($)
Electric | Cross-State Air Pollution Rule |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
Number Of States Impacted By Cross State Air Pollution Rule | 23 |  |  |  |  |  |  |  |
Electric | Mercury and Other Hazardous Air Pollutants |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
Percentage mercury emission reduction |  |  |  |  |  |  | 90.00% |  |
Electric | Climate Change |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
Percentage greenhouse gas emission reduction nationwide |  |  |  |  |  |  |  | 32.00% |
Interim requirement greenhouse gas emissions reductions |  |  |  |  |  |  |  | 0.667 |
Percentage carbon dioxide emission reduction company goal |  |  |  |  |  |  | 40.00% |  |
Carbon dioxide emissions | T |  |  |  |  |  |  | 29.6 | 31.0 |
Electric | Clean Water Act Cooling Water Intake Structure Rule |  |  |  |  |  |  |  |  |
Water Quality |  |  |  |  |  |  |  |  |
Number of compliance options available to meet standard |  |  |  | 7 |  |  |  |  |
Electric | Steam Electric Effluent Guidelines |  |  |  |  |  |  |  |  |
Water Quality |  |  |  |  |  |  |  |  |
Renewal period of facility permits |  | 5 years |  |  |  |  |  |  |
Electric | Steam Electric Effluent Guidelines | Minimum |  |  |  |  |  |  |  |  |
Water Quality |  |  |  |  |  |  |  |  |
Expected environmental costs to achieve required emission reductions |  |  |  |  |  |  | $ 80.0 |  |
Electric | Steam Electric Effluent Guidelines | Maximum |  |  |  |  |  |  |  |  |
Water Quality |  |  |  |  |  |  |  |  |
Expected environmental costs to achieve required emission reductions |  |  |  |  |  |  | $ 110.0 |  |
Electric | Weston and Pulliam Consent Decree | WPS |  |  |  |  |  |  |  |  |
Consent Decrees |  |  |  |  |  |  |  |  |
Beneficial environmental project amount |  |  |  |  |  | $ 6.0 |  |  |
Civil penalty |  |  |  |  |  | $ 1.2 |  |  |
Regulatory asset for undepreciated book value of retired plants |  |  |  |  |  |  |  |  | $ 11.5
Electric | Joint Ownership Power Plants Consent Decree - Columbia and Edgewater | WPS |  |  |  |  |  |  |  |  |
Consent Decrees |  |  |  |  |  |  |  |  |
Beneficial environmental project amount |  |  |  |  | $ 1.3 |  |  |  |
Civil penalty |  |  |  |  | $ 0.4 |  |  |  |
Natural gas | Climate Change |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
Carbon dioxide emissions | T |  |  |  |  |  |  | 26.7 | 27.2 |
Natural gas | Manufactured Gas Plant Remediation |  |  |  |  |  |  |  |  |
Manufactured Gas Plant Remediation |  |  |  |  |  |  |  |  |
Regulatory assets recorded for remediation of manufactured gas plant sites |  |  | $ 697.0 |  |  |  | $ 702.7 | $ 697.0 |
Reserves recorded for remediation of manufactured gas plant sites |  |  | $ 628.0 |  |  |  | $ 633.4 | $ 628.0 |
WISCONSIN | Electric | Climate Change |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
Percentage greenhouse gas emission reduction state |  |  |  |  |  |  |  | 41.00% |
Percentage greenhouse gas emission reduction for retirement of a nuclear plant |  |  | 10.00% |  |  |  |  |  |
WISCONSIN | Electric | Renewables, Efficiency, and Conservation |  |  |  |  |  |  |  |  |
Renewables, Efficiency, and Conservation |  |  |  |  |  |  |  |  |
Percent renewable energy portfolio requirement for years 2016 through 2018 |  |  |  |  |  |  | 10.00% |  |
Percent of annual operating revenues |  |  |  |  |  |  | 1.20% |  |
Percentage renewable portfolio requirement for years 2019 through 2020 |  |  |  |  |  |  | 12.50% |  |
Percentage renewable portfolio requirement for 2021 |  |  |  |  |  |  | 15.00% |  |
WISCONSIN | Electric | Renewables, Efficiency, and Conservation | WE |  |  |  |  |  |  |  |  |
Renewables, Efficiency, and Conservation |  |  |  |  |  |  |  |  |
Renewable energy percent required |  |  |  |  |  |  | 8.27% |  |
WISCONSIN | Electric | Renewables, Efficiency, and Conservation | WPS |  |  |  |  |  |  |  |  |
Renewables, Efficiency, and Conservation |  |  |  |  |  |  |  |  |
Renewable energy percent required |  |  |  |  |  |  | 9.74% |  |
MICHIGAN | Electric | Climate Change |  |  |  |  |  |  |  |  |
Air Quality |  |  |  |  |  |  |  |  |
Percentage greenhouse gas emission reduction state |  |  |  |  |  |  |  | 39.00% |
MICHIGAN | Electric | Renewables, Efficiency, and Conservation |  |  |  |  |  |  |  |  |
Renewables, Efficiency, and Conservation |  |  |  |  |  |  |  |  |
Percent renewable energy portfolio requirement for years 2016 through 2018 |  |  |  |  |  |  | 10.00% |  |
MICHIGAN | Electric | Renewables, Efficiency, and Conservation | Maximum |  |  |  |  |  |  |  |  |
Renewables, Efficiency, and Conservation |  |  |  |  |  |  |  |  |
Energy optimization target |  |  |  |  |  |  | 1.00% |  |

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