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OPERATING REVENUES - DISAGGREGATION OF NATURAL GAS UTILITY OPERATING REVENUES BY CUSTOMER CLASS (Details) - Revenues from contracts with customers - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | $ 2,669.0 | $ 2,086.9
Natural gas |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,547.7 | 1,032.7
Total Utility Operations | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 2,646.1 | 2,071.3
Total Utility Operations | Natural gas | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,546.4 | 1,032.3
Total Utility Operations | Natural gas | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,092.4 | 985.7
Total Utility Operations | Natural gas | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 769.4 | 691.3
Total Utility Operations | Natural gas | Transferred over time | Commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 323.0 | 294.4
Total Utility Operations | Natural gas | Transferred over time | Transportation |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 109.6 | 107.3
Total Utility Operations | Natural gas | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 344.4 | (60.7)
Wisconsin | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,722.3 | 1,493.5
Wisconsin | Natural gas | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 627.3 | 458.9
Wisconsin | Natural gas | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 524.0 | 464.4
Wisconsin | Natural gas | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 347.6 | 313.1
Wisconsin | Natural gas | Transferred over time | Commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 176.4 | 151.3
Wisconsin | Natural gas | Transferred over time | Transportation |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 24.4 | 24.1
Wisconsin | Natural gas | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 78.9 | (29.6)
Illinois | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 693.5 | 433.6
Illinois | Natural gas | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 693.5 | 433.6
Illinois | Natural gas | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 436.6 | 374.3
Illinois | Natural gas | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 333.9 | 282.9
Illinois | Natural gas | Transferred over time | Commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 102.7 | 91.4
Illinois | Natural gas | Transferred over time | Transportation |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 74.2 | 72.7
Illinois | Natural gas | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 182.7 | (13.4)
Other States | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 230.3 | 144.2
Other States | Natural gas | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 225.6 | 139.8
Other States | Natural gas | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 131.8 | 147.0
Other States | Natural gas | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 87.9 | 95.3
Other States | Natural gas | Transferred over time | Commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 43.9 | 51.7
Other States | Natural gas | Transferred over time | Transportation |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 11.0 | 10.5
Other States | Natural gas | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | $ 82.8 | $ (17.7)

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