OPERATING REVENUES - OTHER NON-UTILITY OPERATING REVENUES (Details) - Revenues from contracts with customers - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 1,997.6	$ 1,743.4	$ 5,100.8	$ 4,347.9
Other non-utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	59.6	60.3	125.0	115.8
Other non-utility revenues | We Power revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	6.1	6.1	12.2	12.1
Transferred over time | Other non-utility revenues | Renewable generation revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	48.1	49.3	101.9	93.8
Transferred over time | Other non-utility revenues | Appliance service revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 5.4	$ 4.9	$ 10.9	$ 9.9