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Operating Revenues - Disaggregation Of Operating Revenues by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 1,947.5 | $ 1,608.0 | $ 1,590.2 | $ 2,377.4 | $ 2,076.8 | $ 1,643.7 | $ 1,672.5 | $ 2,286.5 | $ 7,523.1 | $ 7,679.5 | $ 7,648.5
Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 7,449.3 | 7,680.3 |
Other operating revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 73.8 | (0.8) |
Total regulated revenues | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 7,379.1 | 7,627.3 |
Electric | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 4,307.7 | 4,432.4 |
Natural gas | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 3,071.4 | 3,194.9 |
Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 3,068.1 | 3,185.9 |
Other non-utility revenues | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 70.2 | 53.0 |
Total Utility Operations |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 7,430.2 | 7,632.9 |
Total Utility Operations | Other operating revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 37.7 | (1.7) |
Total Utility Operations | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 7,392.5 | 7,634.6 |
Total Utility Operations | Total regulated revenues | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 7,375.8 | 7,618.3 |
Total Utility Operations | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 4,307.7 | 4,432.4 |
Total Utility Operations | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 3,068.1 | 3,185.9 |
Total Utility Operations | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 16.7 | 16.3 |
Wisconsin |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 5,647.1 | 5,794.7 |
Wisconsin | Other operating revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 15.3 | 11.7 |
Wisconsin | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 5,631.8 | 5,783.0 |
Wisconsin | Total regulated revenues | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 5,631.8 | 5,783.0 |
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 4,307.7 | 4,432.4 |
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 1,324.1 | 1,350.6 |
Wisconsin | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Illinois |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,357.1 | 1,400.0 |
Illinois | Other operating revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 24.6 | (7.1) |
Illinois | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 1,332.5 | 1,407.1 |
Illinois | Total regulated revenues | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 1,332.4 | 1,406.9 |
Illinois | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Illinois | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 1,332.4 | 1,406.9 |
Illinois | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0.1 | 0.2 |
Other States |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 426.0 | 438.2 |
Other States | Other operating revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (2.2) | (6.3) |
Other States | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 428.2 | 444.5 |
Other States | Total regulated revenues | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 411.6 | 428.4 |
Other States | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Other States | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 411.6 | 428.4 |
Other States | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 16.6 | 16.1 |
Non-Utility Energy Infrastructure |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 495.9 | 468.4 |
Non-Utility Energy Infrastructure | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 102.6 | 80.0 |
Non-Utility Energy Infrastructure | Other operating revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 393.3 | 388.4 |
Non-Utility Energy Infrastructure | Total regulated revenues | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 47.4 | 45.4 |
Non-Utility Energy Infrastructure | Electric | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Non-Utility Energy Infrastructure | Natural gas | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 47.4 | 45.4 |
Non-Utility Energy Infrastructure | Other non-utility revenues | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 55.2 | 34.6 |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 4.4 | 8.7 |
Corporate and Other | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 4.0 | 7.9 |
Corporate and Other | Other operating revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0.4 | 0.8 |
Corporate and Other | Total regulated revenues | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Corporate and Other | Electric | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Corporate and Other | Natural gas | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Corporate and Other | Other non-utility revenues | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 4.0 | 7.9 |
Reconciling Eliminations |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (407.4) | (430.5) |
Reconciling Eliminations | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | (49.8) | (42.2) |
Reconciling Eliminations | Other operating revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (357.6) | (388.3) |
Reconciling Eliminations | Total regulated revenues | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | (44.1) | (36.4) |
Reconciling Eliminations | Electric | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Reconciling Eliminations | Natural gas | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | (44.1) | (36.4) |
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | $ (5.7) | $ (5.8) |

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