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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Operating Revenues |  |
Operating revenues | $ 2,377.4 | $ 2,286.5
Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 2,376.5 | 2,290.0
Other operating revenues |  |
Disaggregation of Operating Revenues |  |
Operating revenues | 0.9 | (3.5)
Total utility revenues | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 2,358.2 | 2,278.4
Electric | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,061.8 | 1,067.7
Natural gas | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,296.4 | 1,210.7
Natural gas | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,294.7 | 1,198.3
Other non-utility revenues | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 18.3 | 11.6
Total Utility Operations |  |
Disaggregation of Operating Revenues |  |
Operating revenues | 2,355.1 | 2,266.3
Total Utility Operations | Other operating revenues |  |
Disaggregation of Operating Revenues |  |
Operating revenues | (5.6) | (3.6)
Total Utility Operations | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 2,360.7 | 2,269.9
Total Utility Operations | Total utility revenues | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 2,356.5 | 2,266.0
Total Utility Operations | Electric | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,061.8 | 1,067.7
Total Utility Operations | Natural gas | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,294.7 | 1,198.3
Total Utility Operations | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 4.2 | 3.9
Wisconsin |  |
Disaggregation of Operating Revenues |  |
Operating revenues | 1,633.4 | 1,589.1
Wisconsin | Other operating revenues |  |
Disaggregation of Operating Revenues |  |
Operating revenues | 6.7 | 3.4
Wisconsin | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,626.7 | 1,585.7
Wisconsin | Total utility revenues | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,626.7 | 1,585.7
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,061.8 | 1,067.7
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 564.9 | 518.0
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 | 536.5 | 507.3
Illinois | Other operating revenues |  |
Disaggregation of Operating Revenues |  |
Operating revenues | (8.2) | (0.3)
Illinois | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 544.7 | 507.6
Illinois | Total utility revenues | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 544.6 | 507.6
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 | 544.6 | 507.6
Illinois | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 0.1 | 0.0
Other States |  |
Disaggregation of Operating Revenues |  |
Operating revenues | 185.2 | 169.9
Other States | Other operating revenues |  |
Disaggregation of Operating Revenues |  |
Operating revenues | (4.1) | (6.7)
Other States | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 189.3 | 176.6
Other States | Total utility revenues | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 185.2 | 172.7
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 | 185.2 | 172.7
Other States | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 4.1 | 3.9
Non-Utility Energy Infrastructure |  |
Disaggregation of Operating Revenues |  |
Operating revenues | 127.8 | 118.1
Non-Utility Energy Infrastructure | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 29.7 | 22.0
Non-Utility Energy Infrastructure | Other operating revenues |  |
Disaggregation of Operating Revenues |  |
Operating revenues | 98.1 | 96.1
Non-Utility Energy Infrastructure | Total utility revenues | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 16.4 | 14.9
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 | 16.4 | 14.9
Non-Utility Energy Infrastructure | Other non-utility revenues | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 13.3 | 7.1
Corporate and Other |  |
Disaggregation of Operating Revenues |  |
Operating revenues | 1.7 | 1.4
Corporate and Other | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1.5 | 1.3
Corporate and Other | Other operating revenues |  |
Disaggregation of Operating Revenues |  |
Operating revenues | 0.2 | 0.1
Corporate and Other | Total utility 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 | 1.5 | 1.3
Reconciling Eliminations |  |
Disaggregation of Operating Revenues |  |
Operating revenues | (107.2) | (99.3)
Reconciling Eliminations | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | (15.4) | (3.2)
Reconciling Eliminations | Other operating revenues |  |
Disaggregation of Operating Revenues |  |
Operating revenues | (91.8) | (96.1)
Reconciling Eliminations | Total utility revenues | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | (14.7) | (2.5)
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 | (14.7) | (2.5)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | $ (0.7) | $ (0.7)

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