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Variable Interest Entities - Investment in Transmission Affiliates (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Variable interest entities
Equity investment	$ 2,191.6	$ 2,081.6	$ 1,981.9
ATC
Variable interest entities
Ownership interest (as a percent)	60.00%
Equity investment	$ 2,085.1	1,980.8	1,884.6	$ 1,766.9
ATC Holdco
Variable interest entities
Ownership interest (as a percent)	75.00%
Equity investment	$ 23.8	$ 25.1	$ 24.6	$ 22.5

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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