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Operating Revenues - Disaggregation of Electric Utility Operating Revenues by Customer Class (Details) - Revenues from contracts with customers $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Disaggregation of Operating Revenues |
Revenues from contracts with customers | $ 7,680.3
Electric |
Disaggregation of Operating Revenues |
Revenues from contracts with customers | 4,432.4
Wisconsin | Transferred over time |
Disaggregation of Operating Revenues |
Revenues from contracts with customers | 5,783.0
Wisconsin | Electric | Transferred over time |
Disaggregation of Operating Revenues |
Revenues from contracts with customers | 4,432.4
Wisconsin | Electric | Transferred over time | Total retail revenues |
Disaggregation of Operating Revenues |
Revenues from contracts with customers | 3,987.0
Wisconsin | Electric | Transferred over time | Residential |
Disaggregation of Operating Revenues |
Revenues from contracts with customers | 1,636.3
Wisconsin | Electric | Transferred over time | Small commercial and industrial |
Disaggregation of Operating Revenues |
Revenues from contracts with customers | 1,408.6
Wisconsin | Electric | Transferred over time | Large commercial and industrial |
Disaggregation of Operating Revenues |
Revenues from contracts with customers | 912.2
Wisconsin | Electric | Transferred over time | Other |
Disaggregation of Operating Revenues |
Revenues from contracts with customers | 29.9
Wisconsin | Electric | Transferred over time | Wholesale |
Disaggregation of Operating Revenues |
Revenues from contracts with customers | 210.1
Wisconsin | Electric | Transferred over time | Resale |
Disaggregation of Operating Revenues |
Revenues from contracts with customers | 192.2
Wisconsin | Electric | Transferred over time | Steam |
Disaggregation of Operating Revenues |
Revenues from contracts with customers | 24.1
Wisconsin | Electric | Transferred over time | Other utility revenues |
Disaggregation of Operating Revenues |
Revenues from contracts with customers | $ 19.0

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