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INVESTMENT IN TRANSMISSION AFFILIATES - RECEIVABLES AND PAYABLES (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Investment in transmission affiliates |  |
Accounts payable for services received from ATC | $ 791.5 | $ 1,137.1
ATC |  |
Investment in transmission affiliates |  |
Accounts receivable for services provided to ATC | 2.0 | 1.4
Accounts payable for services received from ATC | 38.9 | 34.4
Amounts due from ATC for transmission infrastructure upgrade | $ 11.3 | $ 54.5

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