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INVESTMENT IN TRANSMISSION AFFILIATES - RECEIVABLES AND PAYABLES (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investment in transmission affiliates
Accounts payable for services received from ATC	$ 640.9	$ 896.6
ATC
Investment in transmission affiliates
Accounts receivable for services provided to ATC	1.8	1.6
Accounts payable for services received from ATC	49.7	49.9
Amounts due from ATC for transmission infrastructure upgrade	$ 42.1	$ 46.1

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