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CAPITAL CONSTRUCTION FUND (Tables) | 12 Months Ended
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Dec. 31, 2024
CAPITAL CONSTRUCTION FUND |
Schedule of capital construction fund | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended
​ | ​ | December 31,
(In millions) |  | 2024 |  | 2023
CCF Cash and Cash Equivalents: | ​ | ​ | ​ | ​ | ​ | ​
CCF cash and cash equivalents balance at beginning of period | ​ | $ | 599.4 | ​ | $ | 518.2
Cash deposits into the CCF | ​ | ​ | 50.0 | ​ | ​ | 100.0
Cash paid for purchase of U.S. Treasury debt securities and accrued interest | ​ | ​ | (449.8) | ​ | ​ | —
Proceeds from U.S. Treasury debt securities at maturity | ​ | ​ | 48.1 | ​ | ​ | —
Interest income deposited into the CCF | ​ | ​ | 18.8 | ​ | ​ | 31.1
Repurchase of assigned accounts receivable | ​ | ​ | 53.8 | ​ | ​ | —
Qualifying withdrawal payments out of the CCF | ​ | ​ | (89.6) | ​ | ​ | (49.9)
Total CCF cash and cash equivalents balance at end of period | ​ | $ | 230.7 | ​ | $ | 599.4
​ | ​ | ​ | ​ | ​ | ​ | ​
CCF Investments: | ​ | ​ | ​ | ​ | ​ | ​
CCF investments balance at beginning of period | ​ | $ | — | ​ | $ | —
Purchase of U.S. Treasury debt securities | ​ | ​ | 448.1 | ​ | ​ | —
Withdrawals of U.S. Treasury debt securities at maturity | ​ | ​ | (48.1) | ​ | ​ | —
Accretion of investments | ​ | ​ | 11.9 | ​ | ​ | —
Total CCF investments balance at end of period | ​ | ​ | 411.9 | ​ | ​ | —
Total CCF cash and cash equivalents, and investments balance at end of period | ​ | $ | 642.6 | ​ | $ | 599.4
Schedule of assigned eligible accounts receivable, and on deposit to the Capital Construction Fund | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
(In millions) |  | 2024 |  | 2023
Capital Construction Fund: | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents, and investments account | ​ | $ | 642.6 | ​ | $ | 599.4
Assigned accounts receivables | ​ | $ | 178.1 | ​ | $ | 218.1

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- Definition Tabular disclosure of capital construction fund. + References No definition available. + Details
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