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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS BALANCE SHEET INFORMATION (Details) - ATC - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Investment in transmission affiliates |  |
Accounts receivable for services provided to ATC | $ 3.3 | $ 3.4
Accounts payable for services received from ATC | 29.0 | 28.2
Amounts due from ATC for transmission infrastructure upgrades | $ 2.8 | $ 29.4

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