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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS (Details) - ATC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investment in transmission affiliates
Charges to ATC for services and construction	$ 4.5	$ 3.9	$ 12.3	$ 14.8
Charges from ATC for network transmission services	$ 94.3	$ 90.9	$ 283.1	$ 272.8

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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-Section 50
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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-Section 50
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Charges to related parties for services, construction, and/or operations (excluding transactions that are eliminated in consolidated or combined financial statements) during the period.

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