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VARIABLE INTEREST ENTITIES - TRANSMISSION AFFILIATES (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
ATC
Variable interest entities
Ownership interest (as a percent)	60.00%
Equity investment	$ 2,054.1	$ 2,029.7	$ 1,980.8	$ 1,959.2	$ 1,931.8	$ 1,884.6
ATC Holdco
Variable interest entities
Ownership interest (as a percent)	75.00%
Equity investment	$ 26.7	$ 26.1	$ 25.1	$ 24.6	$ 24.1	$ 24.6

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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- 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.

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