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OPERATING REVENUES - DISAGGREGATION OF ELECTRIC UTILITY OPERATING REVENUES BY CUSTOMER CLASS (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) contract performance_obligations
Electric |  |
Disaggregation of Operating Revenues |  |
Number of performance obligations | performance_obligations |  | 1
Number of contracts | contract |  | 1
Number of days payment is due |  | 30 days
Electric | Wholesale |  |
Disaggregation of Operating Revenues |  |
Number of performance obligations | performance_obligations |  | 2
Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | $ 1,635.7 | $ 5,599.3
Revenues from contracts with customers | Electric |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,218.3 | 3,370.2
Wisconsin | Revenues from contracts with customers | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,385.7 | 4,292.0
Wisconsin | Revenues from contracts with customers | Electric | Transferred over time |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,218.3 | 3,370.2
Wisconsin | Revenues from contracts with customers | Electric | Transferred over time | Residential |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 465.3 | 1,243.3
Wisconsin | Revenues from contracts with customers | Electric | Transferred over time | Small commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 388.2 | 1,072.2
Wisconsin | Revenues from contracts with customers | Electric | Transferred over time | Large commercial and industrial |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 249.7 | 695.2
Wisconsin | Revenues from contracts with customers | Electric | Transferred over time | Other |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 7.5 | 22.4
Wisconsin | Revenues from contracts with customers | Electric | Transferred over time | Total retail revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1,110.7 | 3,033.1
Wisconsin | Revenues from contracts with customers | Electric | Transferred over time | Wholesale |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 62.0 | 175.3
Wisconsin | Revenues from contracts with customers | Electric | Transferred over time | Resale |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 40.7 | 139.6
Wisconsin | Revenues from contracts with customers | Electric | Transferred over time | Steam |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 2.7 | 16.9
Wisconsin | Revenues from contracts with customers | Electric | Transferred over time | Other utility revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | $ 2.2 | $ 5.3

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