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Equity Investments - Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Equity Method Investments [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment Beginning Balance |  |  |  | $ 322.7 |  |  |  |  |  |  |  |  | $ 322.7 |  |
Cash Investments |  |  |  |  |  |  |  |  |  |  |  |  | 8.2 | $ 5.9 | $ 17.6
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 21.7 | 18.7 | 20.0
Equity Investment Ending Balance | $ 331.2 |  |  |  | $ 322.7 |  |  |  |  |  |  |  | 331.2 | 322.7 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Assets | 468.1 |  |  |  | 718.0 |  |  |  |  |  |  |  | 468.1 | 718.0 |
Total Assets | 6,656.4 |  |  |  | 6,845.6 |  |  |  |  |  |  |  | 6,656.4 | 6,845.6 |
Current Liabilities | 377.6 |  |  |  | 716.2 |  |  |  |  |  |  |  | 377.6 | 716.2 |
Members’ Equity | 3,406.6 |  |  |  | 3,348.3 |  |  |  | $ 2,937.5 |  |  |  | 3,406.6 | 3,348.3 | 2,937.5
Total Liabilities and Members’ Equity | 6,656.4 |  |  |  | 6,845.6 |  |  |  |  |  |  |  | 6,656.4 | 6,845.6 |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | 402.7 | $ 378.8 | $ 533.4 | 564.9 | 425.8 | $ 388.3 | $ 373.1 | $ 383.5 | 399.0 | $ 345.4 | $ 335.6 | $ 339.2 | 1,879.8 | 1,570.7 | 1,419.2
Net Income |  |  |  |  |  |  |  |  |  |  |  |  | 178.9 | 131.3 | 137.8
Net Loss Attributable to Non-Controlling Interest |  |  |  |  |  |  |  |  |  |  |  |  | (68.2) | (58.0) | (31.4)
ATC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Assets | 115.2 |  |  |  | 89.6 |  |  |  |  |  |  |  | 115.2 | 89.6 |
Non-Current Assets | 6,337.0 |  |  |  | 5,997.8 |  |  |  |  |  |  |  | 6,337.0 | 5,997.8 |
Total Assets | 6,452.2 |  |  |  | 6,087.4 |  |  |  |  |  |  |  | 6,452.2 | 6,087.4 |
Current Liabilities | 495.9 |  |  |  | 511.9 |  |  |  |  |  |  |  | 495.9 | 511.9 |
Long-Term Debt | 2,736.0 |  |  |  | 2,613.0 |  |  |  |  |  |  |  | 2,736.0 | 2,613.0 |
Other Non-Current Liabilities | 585.2 |  |  |  | 485.8 |  |  |  |  |  |  |  | 585.2 | 485.8 |
Members’ Equity | 2,635.1 |  |  |  | 2,476.7 |  |  |  |  |  |  |  | 2,635.1 | 2,476.7 |
Total Liabilities and Members’ Equity | 6,452.2 |  |  |  | 6,087.4 |  |  |  |  |  |  |  | 6,452.2 | 6,087.4 |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 818.9 | 751.2 | 754.8
Operating Expense |  |  |  |  |  |  |  |  |  |  |  |  | 407.6 | 381.5 | 376.2
Other Expense |  |  |  |  |  |  |  |  |  |  |  |  | 131.7 | 122.9 | 113.9
Net Income |  |  |  |  |  |  |  |  |  |  |  |  | 279.6 | 246.8 | 264.7
Nobles 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loss Attributable to Non-Controlling Interest |  |  |  |  |  |  |  |  |  |  |  |  | 10.2 |  |
ATC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment Beginning Balance |  |  |  | 165.4 |  |  |  | $ 154.5 |  |  |  |  | 165.4 | 154.5 |
Cash Investments |  |  |  |  |  |  |  |  |  |  |  |  | 8.2 | 5.9 |
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 23.1 | 19.3 | 21.3
Distributed Earnings |  |  |  |  |  |  |  |  |  |  |  |  | (18.3) | (15.5) |
Amortization of the Remeasurement of Deferred Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  | 1.3 | 1.2 |
Equity Investment Ending Balance | 179.7 |  |  |  | 165.4 |  |  |  | $ 154.5 |  |  |  | 179.7 | 165.4 | $ 154.5
Nobles 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment Beginning Balance |  |  |  | $ 157.3 |  |  |  |  |  |  |  |  | 157.3 |  |
Equity Earnings |  |  |  |  |  |  |  |  |  |  |  |  | (1.4) |  |
Distributed Earnings |  |  |  |  |  |  |  |  |  |  |  |  | (4.4) |  |
Equity Investment Ending Balance | $ 151.5 |  |  |  | $ 157.3 |  |  |  |  |  |  |  | $ 151.5 | $ 157.3 |

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