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INVESTMENT IN TRANSMISSION AFFILIATES - RECEIVABLES AND PAYABLES (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
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Investment in transmission affiliates |  |
Accounts payable for services received from ATC | $ 1,018.6 | $ 1,140.1
ATC |  |
Investment in transmission affiliates |  |
Accounts receivable for services provided to ATC | 1.9 | 1.6
Accounts payable for services received from ATC | 43.5 | 38.4
Amounts due from ATC for transmission infrastructure upgrades | $ 35.4 | $ 32.2

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