OPERATING REVENUES - OTHER NON-UTILITY OPERATING REVENUES (Details) - Revenues from contracts with customers - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 1,810.0	$ 2,121.2	$ 4,668.2	$ 5,020.8
Other non-utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	54.2	31.6	101.3	78.3
Other non-utility revenues | We Power revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	5.9	5.8	11.8	11.7
Transferred over time | Other non-utility revenues | Wind generation revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	43.6	21.3	79.6	57.5
Transferred over time | Other non-utility revenues | Appliance service repairs
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 4.7	$ 4.5	$ 9.9	$ 9.1