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Operating Revenues - Disaggregation Of Operating Revenues by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Operating Revenues |  |  |
Operating revenues | $ 8,316.0 | $ 7,241.7 | $ 7,523.1
Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 8,235.7 | 7,169.3 | 7,449.3
Other operating revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 80.3 | 72.4 | 73.8
Total regulated revenues | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 8,134.2 | 7,093.0 | 7,379.1
Electric | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 4,516.6 | 4,266.1 | 4,307.7
Natural gas | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 3,617.6 | 2,826.9 | 3,071.4
Natural gas | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 3,614.6 | 2,824.5 | 3,068.1
Other non-utility revenues | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 101.5 | 76.3 | 70.2
Reconciling Eliminations |  |  |
Disaggregation of Operating Revenues |  |  |
Operating revenues | (452.8) | (448.5) | (407.4)
Reconciling Eliminations | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | (52.9) | (51.1) | (49.8)
Reconciling Eliminations | Other operating revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | (399.9) | (397.4) | (357.6)
Reconciling Eliminations | Total regulated revenues | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | (43.8) | (42.0) | (44.1)
Reconciling Eliminations | Electric | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0
Reconciling Eliminations | Natural gas | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | (43.8) | (42.0) | (44.1)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | (9.1) | (9.1) | (5.7)
Total Utility Operations |  |  |
Disaggregation of Operating Revenues |  |  |
Operating revenues | 8,228.8 | 7,179.5 | 7,430.2
Total Utility Operations | Other operating revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 79.8 | 71.8 | 37.7
Total Utility Operations | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 8,149.0 | 7,107.7 | 7,392.5
Total Utility Operations | Total regulated revenues | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 8,131.2 | 7,090.6 | 7,375.8
Total Utility Operations | Electric | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 4,516.6 | 4,266.1 | 4,307.7
Total Utility Operations | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 3,614.6 | 2,824.5 | 3,068.1
Total Utility Operations | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 17.8 | 17.1 | 16.7
Wisconsin |  |  |
Disaggregation of Operating Revenues |  |  |
Operating revenues | 6,037.0 | 5,473.5 | 5,647.1
Wisconsin | Other operating revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 30.1 | 11.8 | 15.3
Wisconsin | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 6,006.9 | 5,461.7 | 5,631.8
Wisconsin | Total regulated revenues | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 6,006.9 | 5,461.7 | 5,631.8
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 4,516.6 | 4,266.1 | 4,307.7
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 1,490.3 | 1,195.6 | 1,324.1
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 | 0.0
Illinois |  |  |
Disaggregation of Operating Revenues |  |  |
Operating revenues | 1,672.8 | 1,321.9 | 1,357.1
Illinois | Other operating revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 42.5 | 54.0 | 24.6
Illinois | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 1,630.3 | 1,267.9 | 1,332.5
Illinois | Total regulated revenues | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 1,630.3 | 1,267.9 | 1,332.4
Illinois | Electric | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0
Illinois | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 1,630.3 | 1,267.9 | 1,332.4
Illinois | 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 | 0.1
Other States |  |  |
Disaggregation of Operating Revenues |  |  |
Operating revenues | 519.0 | 384.1 | 426.0
Other States | Other operating revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 7.2 | 6.0 | (2.2)
Other States | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 511.8 | 378.1 | 428.2
Other States | Total regulated revenues | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 494.0 | 361.0 | 411.6
Other States | Electric | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 0.0 | 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 | 494.0 | 361.0 | 411.6
Other States | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 17.8 | 17.1 | 16.6
Non-Utility Energy Infrastructure |  |  |
Disaggregation of Operating Revenues |  |  |
Operating revenues | 539.5 | 508.5 | 495.9
Non-Utility Energy Infrastructure | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 139.6 | 111.0 | 102.6
Non-Utility Energy Infrastructure | Other operating revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 399.9 | 397.5 | 393.3
Non-Utility Energy Infrastructure | Total regulated revenues | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 46.8 | 44.4 | 47.4
Non-Utility Energy Infrastructure | Electric | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0
Non-Utility Energy Infrastructure | Natural gas | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 46.8 | 44.4 | 47.4
Non-Utility Energy Infrastructure | Other non-utility revenues | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 92.8 | 66.6 | 55.2
Corporate and Other |  |  |
Disaggregation of Operating Revenues |  |  |
Operating revenues | 0.5 | 2.2 | 4.4
Corporate and Other | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 0.0 | 1.7 | 4.0
Corporate and Other | Other operating revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 0.5 | 0.5 | 0.4
Corporate and Other | Total regulated revenues | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | 0.0 | 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 | 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 | 0.0
Corporate and Other | Other non-utility revenues | Revenues from contracts with customers |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues from contracts with customers | $ 0.0 | $ 1.7 | $ 4.0

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