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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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