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Investment in Transmission Affiliates - Transactions with ATC (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Balance sheet |  |  |
Accounts payable for services received from ATC | $ 1,137.1 | $ 896.6 |
ATC |  |  |
Transactions with ATC |  |  |
Charges to ATC for services and construction | 21.6 | 17.4 | $ 18.9
Charges from ATC for network transmission services | 413.3 | 377.5 | 363.7
Net payment to ATC related to FERC ROE orders | 0.0 | 0.0 | $ (0.1)
Balance sheet |  |  |
Accounts receivable for services provided to ATC | 1.4 | 1.6 |
Accounts payable for services received from ATC | 34.4 | 49.9 |
Amounts due from ATC for transmission infrastructure upgrades | $ 54.5 | $ 46.1 |

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- Definition The refund (payment) of a previous year's revenue (expense) due to an order issued by the Federal Energy Regulatory Commission regarding ATC's return on equity. + References No definition available. + Details
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