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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS BALANCE SHEET INFORMATION (Details) - ATC - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment in transmission affiliates
Accounts receivable for services provided to ATC	$ 1.8	$ 1.5
Dividends receivable from ATC	24.2	39.9	$ 35.2
Accounts payable for services received from ATC	$ 28.2	$ 31.2

X

- Definition

Amount for accounts payable to related parties.

+ References

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-Publisher FASB
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Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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