PROPERTY, PLANT, AND EQUIPMENT - PLANT TO BE RETIRED (Details) $ in Millions	Jun. 30, 2024 USD ($)	May 31, 2024 MW
WE | OCPP
Property, plant, and equipment
Net book value of plant to be retired	$ 675.8
WE | West Riverside Energy Center
Property, plant, and equipment
Jointly Owned Utility Plant, Proportionate Ownership Share of Capacity | MW		200
WPS | Columbia Energy Center
Property, plant, and equipment
Net book value of plant to be retired	$ 252.1