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INCOME TAXES - CASH PAID FOR INCOME TAXES, NET (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Income taxes paid (received) by jurisdiction, net    
Federal $ (20.0) $ 12.0
State 31.3 14.3
Total income taxes paid, net 11.3 26.3
PTCs sold to third parties 17.0 29.1
ITCs sold to third parties 68.0  
Wisconsin jurisdiction exceeded 5% of income taxes paid    
Income taxes paid (received) by jurisdiction, net    
State $ 31.3 $ 14.3