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OPERATING REVENUES - DISAGGREGATION OF ELECTRIC UTILITY OPERATING REVENUES BY CUSTOMER CLASS (Details) - Revenues from contracts with customers - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | $ 1,587.6 | $ 1,635.7 | $ 5,528.0 | $ 5,599.3
Electric |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,185.4 | 1,218.3 | 3,269.1 | 3,370.2
Wisconsin | Transferred over time |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,336.5 | 1,385.7 | 4,212.4 | 4,292.0
Wisconsin | Electric | Transferred over time |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,185.4 | 1,218.3 | 3,269.1 | 3,370.2
Wisconsin | Electric | Transferred over time | Total retail revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,085.1 | 1,110.7 | 2,958.9 | 3,033.1
Wisconsin | Electric | Transferred over time | Residential |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 454.7 | 465.3 | 1,218.1 | 1,243.3
Wisconsin | Electric | Transferred over time | Small commercial and industrial |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 385.6 | 388.2 | 1,050.8 | 1,072.2
Wisconsin | Electric | Transferred over time | Large commercial and industrial |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 237.9 | 249.7 | 668.0 | 695.2
Wisconsin | Electric | Transferred over time | Other |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 6.9 | 7.5 | 22.0 | 22.4
Wisconsin | Electric | Transferred over time | Wholesale |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 53.1 | 62.0 | 145.4 | 175.3
Wisconsin | Electric | Transferred over time | Resale |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 29.5 | 40.7 | 119.7 | 139.6
Wisconsin | Electric | Transferred over time | Steam |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 2.4 | 2.7 | 16.8 | 16.9
Wisconsin | Electric | Transferred over time | Other utility revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | $ 15.3 | $ 2.2 | $ 28.3 | $ 5.3

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