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INCOME TAXES - CASH PAID (RECEIVED) 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 $ (199.4) $ (195.0)
State 0.2 (25.0)
Total income taxes received, net (199.2) (220.0)
PTCs sold to third parties 153.3 195.0
ITCs sold to third parties $ 81.6  
Wisconsin    
Income taxes paid (received) by jurisdiction, net    
State   $ (25.0)