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INVESTMENT IN TRANSMISSION AFFILIATES - RECEIVABLES AND PAYABLES (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Investment in transmission affiliates
Accounts payable for services received from ATC	$ 917.0	$ 1,137.1
ATC
Investment in transmission affiliates
Accounts receivable for services provided to ATC	1.7	1.4
Accounts payable for services received from ATC	38.4	34.4
Amounts due from ATC for transmission infrastructure upgrades	$ 20.9	$ 54.5

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