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CAPITAL CONSTRUCTION FUND (Tables) | 3 Months Ended
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Mar. 31, 2024
CAPITAL CONSTRUCTION FUND |
Schedule of capital construction fund | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 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 | ​ | ​ | — | ​ | ​ | 100.0
Cash paid for purchase of U.S. Treasury debt securities and accrued interest | ​ | ​ | (449.8) | ​ | ​ | —
Interest earned on deposits and investments, net | ​ | ​ | 5.1 | ​ | ​ | 5.5
Total CCF cash and cash equivalents balance at end of period | ​ | ​ | 154.7 | ​ | ​ | 623.7
CCF Investments: | ​ | ​ | ​ | ​ | ​ | ​
CCF investments balance at beginning of period | ​ | ​ | — | ​ | ​ | —
Purchase of U.S. Treasury debt securities | ​ | ​ | 448.1 | ​ | ​ | —
Accretion of investments | ​ | ​ | 1.9 | ​ | ​ | —
Total CCF investments balance at end of period | ​ | ​ | 450.0 | ​ | ​ | —
Accrued interest earned on Cash and Cash Equivalents, and Investments at end of period: | ​ | ​ | 2.1 | ​ | ​ | —
Total CCF cash and cash equivalents, and investments balance at end of period | ​ | $ | 606.8 | ​ | $ | 623.7
Schedule of maturities of capital construction fund investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | March 31, 2024
Year (in millions) |  | Cost | ​ | Fair Value
Remainder of 2024 | ​ | $ | 47.0 | ​ | $ | 46.9
2025 | ​ |  | 186.3 | ​ |  | 185.7
2026 | ​ |  | 164.5 | ​ |  | 163.6
2027 | ​ |  | 52.2 | ​ |  | 51.9
Total CCF investments | ​ | $ | 450.0 | ​ | $ | 448.1
Schedule of CCF assigned accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(In millions) |  | 2024 |  | 2023
CCF assigned accounts receivable balance at beginning of period | ​ | $ | 218.1 | ​ | $ | 9.9
Assigned accounts receivable | ​ | ​ | — | ​ | ​ | 200.0
Interest earned on assigned accounts receivable | ​ | ​ | 3.2 | ​ | ​ | —
CCF assigned accounts receivable balance at end of period | ​ | $ | 221.3 | ​ | $ | 209.9

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