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Variable Interest Entities - Investment in Transmission Affiliates (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
ATC |  |  |  |
Variable interest entities |  |  |  |
Ownership interest (as a percent) | 60.00% |  |  |
Equity investment | $ 1,980.8 | $ 1,884.6 | $ 1,766.9 | $ 1,733.5
ATC Holdco |  |  |  |
Variable interest entities |  |  |  |
Ownership interest (as a percent) | 75.00% |  |  |
Equity investment | $ 25.1 | $ 24.6 | $ 22.5 | $ 30.8

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