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VARIABLE INTEREST ENTITIES - TRANSMISSION AFFILIATES (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Variable interest entities
Equity method investments	$ 2,233.9		$ 2,106.8
ATC
Variable interest entities
Ownership interest (as a percent)	60.00%
Equity method investments	$ 2,121.6	$ 2,085.1	2,001.6	$ 1,980.8
ATC Holdco
Variable interest entities
Ownership interest (as a percent)	75.00%
Equity method investments	$ 27.4	$ 23.8	$ 25.5	$ 25.1

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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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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