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Investment in Transmission Affiliates - Transactions with ATC (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Transactions with ATC |  |  |
Charges from ATC for network transmission services | $ 2,100.5 | $ 1,938.0 | $ 2,005.5
Balance sheet |  |  |
Accounts payable for services received from ATC | 896.6 | 1,198.1 |
ATC |  |  |
Transactions with ATC |  |  |
Charges to ATC for services and construction | 17.4 | 18.9 | 22.9
Charges from ATC for network transmission services | 377.5 | 363.7 | 361.0
Net refund (payment) from (to) ATC related to FERC ROE orders | 0.0 | (0.1) | $ 7.3
Balance sheet |  |  |
Accounts receivable for services provided to ATC | 1.6 | 1.2 |
Accounts payable for services received from ATC | 49.9 | 30.4 |
Amounts due from ATC for transmission infrastructure upgrades | $ 46.1 | $ 26.6 |

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