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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Operating Revenues |  |  |  |
Revenues | $ 1,672.5 | $ 1,631.5 | $ 3,959.0 | $ 3,936.0
Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 1,673.6 |  | 3,963.6 |
Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | (1.1) |  | (4.6) |
Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 1,084.2 |  | 2,151.9 |
Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 576.4 |  | 1,787.1 |
Total utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 1,660.6 |  | 3,939.0 |
Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 13.0 |  | 24.6 |
Public Utility |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 1,665.9 |  | 3,932.2 |
Public Utility | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | (1.4) |  | (5.0) |
Public Utility | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 1,667.3 |  | 3,937.2 |
Public Utility | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 1,084.2 |  | 2,151.9 |
Public Utility | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 579.1 |  | 1,777.4 |
Public Utility | Total utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 1,663.3 |  | 3,929.3 |
Public Utility | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 4.0 |  | 7.9 |
Wisconsin | Public Utility |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 1,325.5 |  | 2,914.6 |
Wisconsin | Public Utility | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 4.9 |  | 8.3 |
Wisconsin | Public Utility | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 1,320.6 |  | 2,906.3 |
Wisconsin | Public Utility | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 1,084.2 |  | 2,151.9 |
Wisconsin | Public Utility | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 236.4 |  | 754.4 |
Wisconsin | Public Utility | Total utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 1,320.6 |  | 2,906.3 |
Wisconsin | Public Utility | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Illinois | Public Utility |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 268.0 |  | 775.3 |
Illinois | Public Utility | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | (5.9) |  | (6.2) |
Illinois | Public Utility | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 273.9 |  | 781.5 |
Illinois | Public Utility | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Illinois | Public Utility | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 273.8 |  | 781.4 |
Illinois | Public Utility | Total utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 273.8 |  | 781.4 |
Illinois | Public Utility | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.1 |  | 0.1 |
Other States | Public Utility |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 72.4 |  | 242.3 |
Other States | Public Utility | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | (0.4) |  | (7.1) |
Other States | Public Utility | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 72.8 |  | 249.4 |
Other States | Public Utility | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Other States | Public Utility | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 68.9 |  | 241.6 |
Other States | Public Utility | Total utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 68.9 |  | 241.6 |
Other States | Public Utility | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 3.9 |  | 7.8 |
Electric Transmission |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Electric Transmission | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Electric Transmission | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Electric Transmission | Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Electric Transmission | Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Electric Transmission | Total utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Electric Transmission | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Non-Utility Energy Infrastructure |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 117.0 |  | 235.1 |
Non-Utility Energy Infrastructure | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 19.3 |  | 41.3 |
Non-Utility Energy Infrastructure | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 97.7 |  | 193.8 |
Non-Utility Energy Infrastructure | Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Non-Utility Energy Infrastructure | Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 10.0 |  | 24.9 |
Non-Utility Energy Infrastructure | Total utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 10.0 |  | 24.9 |
Non-Utility Energy Infrastructure | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 9.3 |  | 16.4 |
Corporate and Other |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 3.1 |  | 4.5 |
Corporate and Other | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 2.8 |  | 4.1 |
Corporate and Other | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.3 |  | 0.4 |
Corporate and Other | Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Corporate and Other | Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Corporate and Other | Total utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Corporate and Other | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 2.8 |  | 4.1 |
Reconciling Eliminations |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | (113.5) |  | (212.8) |
Reconciling Eliminations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | (15.8) |  | (19.0) |
Reconciling Eliminations | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | (97.7) |  | (193.8) |
Reconciling Eliminations | Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.0 |  | 0.0 |
Reconciling Eliminations | Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | (12.7) |  | (15.2) |
Reconciling Eliminations | Total utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | (12.7) |  | (15.2) |
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | $ (3.1) |  | $ (3.8) |

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