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OPERATING REVENUES - OTHER NON-UTILITY OPERATING REVENUES (Details) - Revenues from contracts with customers - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Operating Revenues        
Revenues from contracts with customers $ 1,944.0 $ 1,991.1 $ 6,612.2 $ 7,011.9
Other non-utility revenues        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 48.8 30.6 150.1 108.9
Other non-utility revenues | We Power revenues        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 5.7 5.8 17.5 17.5
Transferred over time | Other non-utility revenues | Wind generation revenues        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 38.2 20.0 117.8 77.5
Transferred over time | Other non-utility revenues | Appliance service repairs        
Disaggregation of Operating Revenues        
Revenues from contracts with customers $ 4.9 $ 4.8 $ 14.8 $ 13.9