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VARIABLE INTEREST ENTITIES - TRANSMISSION AFFILIATES (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
ATC
Variable interest entities
Ownership interest (as a percent)	60.00%
Equity investment	$ 2,001.6	$ 1,980.8	$ 1,896.2	$ 1,884.6
ATC Holdco
Variable interest entities
Ownership interest (as a percent)	75.00%
Equity investment	$ 25.5	$ 25.1	$ 25.5	$ 24.6

- 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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