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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS (Details) - ATC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investment in transmission affiliates
Charges to ATC for services and construction	$ 4.1	$ 3.7	$ 8.7	$ 7.9
Charges from ATC for network transmission services	84.6	87.3	169.1	174.6
Refund from ATC related to a FERC audit	22.0	0.0	22.0	0.0
Refund from ATC per FERC ROE order	$ 0.0	$ 0.0	$ 0.0	$ 28.3

X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

The amount of the refund received from ATC due to a FERC audit.

+ References

No definition available.

+ Details

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X

- Definition

Refund of previous year's revenue that wasn't distributed by ATC. This resulted from an order by the FERC.

+ References

No definition available.

+ Details

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- Definition

Charges to related parties for services, construction, and/or operations (excluding transactions that are eliminated in consolidated or combined financial statements) during the period.

+ References

No definition available.

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- Details

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