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VARIABLE INTEREST ENTITIES - TRANSMISSION AFFILIATES (Details) - USD ($) $ in Millions	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Variable interest entities
Equity method investment	$ 2,284.6			$ 2,138.1
American Transmission Company LLC
Variable interest entities
Ownership interest (as a percent)	60.00%
Equity method investment	$ 2,177.5	$ 2,121.6	$ 2,085.1	2,029.7	$ 2,001.6	$ 1,980.8
ATC Holdco LLC
Variable interest entities
Ownership interest (as a percent)	75.00%
Equity method investment	$ 22.6	$ 27.4	$ 23.8	$ 26.1	$ 25.5	$ 25.1

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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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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