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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS (Details) - ATC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Investment in transmission affiliates
Charges to ATC for services and construction	$ 5.0	$ 6.3	$ 9.5	$ 11.0
Charges from ATC for network transmission services	116.7	103.2	233.4	206.5
Refund from ATC related to FERC ROE orders	$ 0.3	$ 0.0	$ 1.7	$ 0.0

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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
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Net refunds of transmission charges received from American Transmission Company LLC as a result of return on equity orders issued by the Federal Energy Regulatory Commission.

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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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