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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, 2022 | Mar. 31, 2021
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | $ 2,899.6 | $ 2,669.0
Natural gas |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,665.4 | 1,547.7
Total Utility Operations | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 2,857.0 | 2,646.1
Total Utility Operations | Natural gas | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,664.9 | 1,546.4
Total Utility Operations | Natural gas | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,646.9 | 1,092.4
Total Utility Operations | Natural gas | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,129.3 | 769.4
Total Utility Operations | Natural gas | Transferred over time | Commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 517.6 | 323.0
Total Utility Operations | Natural gas | Transferred over time | Transportation |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 120.3 | 109.6
Total Utility Operations | Natural gas | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | (102.3) | 344.4
Wisconsin | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,934.3 | 1,722.3
Wisconsin | Natural gas | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 746.8 | 627.3
Wisconsin | Natural gas | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 775.0 | 524.0
Wisconsin | Natural gas | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 502.5 | 347.6
Wisconsin | Natural gas | Transferred over time | Commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 272.5 | 176.4
Wisconsin | Natural gas | Transferred over time | Transportation |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 25.5 | 24.4
Wisconsin | Natural gas | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | (53.7) | 78.9
Illinois | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 679.9 | 693.5
Illinois | Natural gas | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 679.9 | 693.5
Illinois | Natural gas | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 623.8 | 436.6
Illinois | Natural gas | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 465.5 | 333.9
Illinois | Natural gas | Transferred over time | Commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 158.3 | 102.7
Illinois | Natural gas | Transferred over time | Transportation |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 80.9 | 74.2
Illinois | Natural gas | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | (24.8) | 182.7
Other States | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 242.8 | 230.3
Other States | Natural gas | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 238.2 | 225.6
Other States | Natural gas | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 248.1 | 131.8
Other States | Natural gas | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 161.3 | 87.9
Other States | Natural gas | Transferred over time | Commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 86.8 | 43.9
Other States | Natural gas | Transferred over time | Transportation |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 13.9 | 11.0
Other States | Natural gas | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | $ (23.8) | $ 82.8

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