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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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