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INVESTMENT IN TRANSMISSION AFFILIATES - RECEIVABLES AND PAYABLES (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Investment in transmission affiliates    
Accounts payable for services received from ATC $ 799.9 $ 896.6
ATC    
Investment in transmission affiliates    
Accounts receivable for services provided to ATC 1.6 1.6
Accounts payable for services received from ATC 50.0 49.9
Amounts due from ATC for transmission infrastructure upgrade $ 42.3 $ 46.1