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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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 2,121.2	$ 1,654.3	$ 5,020.8	$ 4,323.3
Electric
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,221.1	1,083.2	2,408.6	2,178.2
Wisconsin | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,550.6	1,295.9	3,484.9	3,018.2
Wisconsin | Electric | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,221.1	1,083.2	2,408.6	2,178.2
Wisconsin | Electric | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,103.4	997.0	2,173.6	1,969.4
Wisconsin | Electric | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	449.7	419.0	912.8	842.7
Wisconsin | Electric | Transferred over time | Small commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	378.4	346.6	748.5	678.0
Wisconsin | Electric | Transferred over time | Large commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	268.1	224.5	497.3	434.0
Wisconsin | Electric | Transferred over time | Other
Disaggregation of Operating Revenues
Revenues from contracts with customers	7.2	6.9	15.0	14.7
Wisconsin | Electric | Transferred over time | Wholesale
Disaggregation of Operating Revenues
Revenues from contracts with customers	40.8	38.6	83.2	78.3
Wisconsin | Electric | Transferred over time | Resale
Disaggregation of Operating Revenues
Revenues from contracts with customers	60.7	37.4	117.5	100.1
Wisconsin | Electric | Transferred over time | Steam
Disaggregation of Operating Revenues
Revenues from contracts with customers	4.7	4.2	16.8	19.0
Wisconsin | Electric | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 11.5	$ 6.0	$ 17.5	$ 11.4

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