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INVESTMENT IN AMERICAN TRANSMISSION COMPANY - RELATED PARTY TRANSACTIONS BALANCE SHEET INFORMATION (Details) - ATC - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Investment in ATC |  |
Accounts receivable for services provided to ATC | $ 1.5 | $ 2.2
Accounts payable for services received from ATC | $ 29.1 | $ 28.7

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