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INVESTMENT IN TRANSMISSION AFFILIATES - RECEIVABLES AND PAYABLES (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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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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