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DERIVATIVE INSTRUMENTS - GAINS (LOSSES) AND NOTIONAL VOLUMES (Details)
MWh in Millions, MMBTU in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
MMBTU
MWh
Jun. 30, 2021
USD ($)
MMBTU
MWh
Jun. 30, 2022
USD ($)
MWh
MMBTU
Jun. 30, 2021
USD ($)
MMBTU
MWh
Realized gains (losses)        
Gains (losses) $ 113.2 $ 15.0 $ 145.8 $ 9.6
Natural gas contracts        
Notional sales volumes        
Notional sales volumes | MMBTU 41.1 47.9 100.6 107.7
Realized gains (losses)        
Gains (losses) $ 108.9 $ 4.8 $ 140.5 $ (2.7)
FTRs and TCRs        
Notional sales volumes        
Notional sales volumes | MWh 7.0 7.4 14.0 15.8
Realized gains (losses)        
Gains (losses) $ 4.3 $ 10.2 $ 5.3 $ 12.3