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OPERATING REVENUES - DISAGGREGATION OF NATURAL GAS 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
Natural gas
Disaggregation of Operating Revenues
Revenues from contracts with customers	868.5	546.4	2,533.9	2,094.1
Total Utility Operations | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	2,093.1	1,633.3	4,950.1	4,279.4
Total Utility Operations | Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	867.5	545.7	2,532.4	2,092.1
Total Utility Operations | Natural gas | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	747.5	584.6	2,394.4	1,677.0
Total Utility Operations | Natural gas | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	530.6	425.6	1,659.9	1,195.0
Total Utility Operations | Natural gas | Transferred over time | Commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	216.9	159.0	734.5	482.0
Total Utility Operations | Natural gas | Transferred over time | Transportation
Disaggregation of Operating Revenues
Revenues from contracts with customers	78.5	73.2	198.8	182.8
Total Utility Operations | Natural gas | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	41.5	(112.1)	(60.8)	232.3
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 | Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	329.5	212.7	1,076.3	840.0
Wisconsin | Natural gas | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	300.6	278.8	1,075.6	802.8
Wisconsin | Natural gas | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	198.5	188.6	701.0	536.2
Wisconsin | Natural gas | Transferred over time | Commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	102.1	90.2	374.6	266.6
Wisconsin | Natural gas | Transferred over time | Transportation
Disaggregation of Operating Revenues
Revenues from contracts with customers	18.0	17.8	43.5	42.2
Wisconsin | Natural gas | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	10.9	(83.9)	(42.8)	(5.0)
Illinois | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	442.2	266.1	1,122.1	959.6
Illinois | Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	442.2	266.1	1,122.1	959.6
Illinois | Natural gas | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	346.8	250.6	970.6	687.2
Illinois | Natural gas | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	268.6	199.1	734.1	533.0
Illinois | Natural gas | Transferred over time | Commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	78.2	51.5	236.5	154.2
Illinois | Natural gas | Transferred over time | Transportation
Disaggregation of Operating Revenues
Revenues from contracts with customers	54.5	48.8	135.4	123.0
Illinois | Natural gas | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	40.9	(33.3)	16.1	149.4
Other States | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	100.3	71.3	343.1	301.6
Other States | Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	95.8	66.9	334.0	292.5
Other States | Natural gas | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	100.1	55.2	348.2	187.0
Other States | Natural gas | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	63.5	37.9	224.8	125.8
Other States | Natural gas | Transferred over time | Commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	36.6	17.3	123.4	61.2
Other States | Natural gas | Transferred over time | Transportation
Disaggregation of Operating Revenues
Revenues from contracts with customers	6.0	6.6	19.9	17.6
Other States | Natural gas | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ (10.3)	$ 5.1	$ (34.1)	$ 87.9

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