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Investment in Transmission Affiliates - Transactions with ATC (Details) - ATC - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Charges from ATC for network transmission services |  |  |
Charges to ATC for services and construction | $ 22.9 | $ 27.5 | $ 25.9
Charges from ATC for network transmission services | 361.0 | 350.5 | 348.1
Net refund from ATC related to FERC ROE orders | 7.3 | 10.7 | $ 0.0
Balance sheet |  |  |
Accounts receivable for services provided to ATC | 2.0 | 3.7 |
Accounts payable for services received from ATC | 30.2 | 29.3 |
Amounts due from ATC for transmission infrastructure upgrades | $ 13.0 | $ 4.6 |

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