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INVESTMENT IN TRANSMISSION AFFILIATES - RECEIVABLES AND PAYABLES (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment in transmission affiliates |  |
Accounts payable for services received from ATC | $ 680.0 | $ 1,198.1
ATC |  |
Investment in transmission affiliates |  |
Accounts receivable for services provided to ATC | 1.5 | 1.2
Accounts payable for services received from ATC | 31.5 | 30.4
Amounts due from ATC for transmission infrastructure upgrades (1) | $ 29.3 | $ 26.6

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