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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
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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Amount for accounts payable to related parties.

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