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PROPERTY, PLANT, AND EQUIPMENT - PUBLIC SERVICE BUILDING AND STEAM TUNNEL ASSETS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2020
Property, plant, and equipment        
Insurance proceeds received for property damage   $ 41.6 $ 0.0  
WE | Public Service Building and Steam Tunnel Assets        
Property, plant, and equipment        
Costs incurred for repairs and restorations   95.3    
Insurance proceeds received for property damage $ 41.0     $ 20.0
Costs included in other operation and maintenance       $ 12.5
Repairs and restorations to be recovered through rates   $ 21.8