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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, 2025 | Mar. 31, 2024
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | $ 3,103.2 | $ 2,604.5
Natural gas |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,717.8 | 1,363.7
Total Utility Operations | Natural gas | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,717.1 | 1,363.4
Total Utility Operations | Natural gas | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,551.8 | 1,236.8
Total Utility Operations | Natural gas | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,097.1 | 884.0
Total Utility Operations | Natural gas | Transferred over time | Commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 454.7 | 352.8
Total Utility Operations | Natural gas | Transferred over time | Transportation |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 144.1 | 131.5
Total Utility Operations | Natural gas | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 21.2 | (4.9)
Wisconsin | Natural gas | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 734.1 | 586.0
Wisconsin | Natural gas | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 739.2 | 589.4
Wisconsin | Natural gas | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 488.8 | 397.6
Wisconsin | Natural gas | Transferred over time | Commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 250.4 | 191.8
Wisconsin | Natural gas | Transferred over time | Transportation |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 33.2 | 29.8
Wisconsin | Natural gas | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | (38.3) | (33.2)
Illinois | Natural gas | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 759.3 | 603.8
Illinois | Natural gas | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 596.8 | 482.0
Illinois | Natural gas | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 465.6 | 375.0
Illinois | Natural gas | Transferred over time | Commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 131.2 | 107.0
Illinois | Natural gas | Transferred over time | Transportation |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 97.4 | 90.1
Illinois | Natural gas | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 65.1 | 31.7
Other States | Natural gas | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 223.7 | 173.6
Other States | Natural gas | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 215.8 | 165.4
Other States | Natural gas | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 142.7 | 111.4
Other States | Natural gas | Transferred over time | Commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 73.1 | 54.0
Other States | Natural gas | Transferred over time | Transportation |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 13.5 | 11.6
Other States | Natural gas | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | $ (5.6) | $ (3.4)

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