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v3.22.0.1

Investment in Transmission Affiliates - ATC Summarized Financial Data (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Investment in transmission affiliates |  |  |
Operating revenues | $ 8,316.0 | $ 7,241.7 | $ 7,523.1
Operating expenses | 6,601.1 | 5,535.6 | 5,991.7
Other expense, net | 216.1 | 276.8 | 271.7
Assets, Current | 2,656.7 | 2,083.0 |
Noncurrent assets | 36,331.8 | 34,945.1 |
Total assets | 38,988.5 | 37,028.1 | 34,951.8
Liabilities, Current | 3,753.0 | 4,148.1 |
Long-term debt | 13,472.4 | 11,672.8 |
Other noncurrent liabilities | 1,203.2 | 1,229.4 |
Total liabilities and members' equity | 38,988.5 | 37,028.1 |
ATC |  |  |
Investment in transmission affiliates |  |  |
Operating revenues | 754.8 | 758.1 | 744.4
Operating expenses | 376.2 | 372.5 | 373.5
Other expense, net | 113.9 | 110.8 | 110.5
Net income | 264.7 | 274.8 | $ 260.4
Assets, Current | 89.8 | 92.7 |
Noncurrent assets | 5,628.1 | 5,400.6 |
Total assets | 5,717.9 | 5,493.3 |
Liabilities, Current | 436.9 | 310.8 |
Long-term debt | 2,513.0 | 2,512.2 |
Other noncurrent liabilities | 422.0 | 378.2 |
Members' equity | 2,346.0 | 2,292.1 |
Total liabilities and members' equity | $ 5,717.9 | $ 5,493.3 |

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