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CAPITAL CONSTRUCTION FUND (Tables) | 6 Months Ended
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Jun. 30, 2024
CAPITAL CONSTRUCTION FUND |
Schedule of capital construction fund | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended
​ | ​ | June 30,
(In millions) |  | 2024 |  | 2023
CCF Cash and Cash Equivalents: | ​ | ​ | ​ | ​ | ​ | ​
CCF cash balance at beginning of period | ​ | $ | 596.7 | ​ | $ | 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 income deposited into the CCF | ​ | ​ | 11.0 | ​ | ​ | 13.1
Repurchase of assigned accounts receivable | ​ | ​ | 35.8 | ​ | ​ | —
Qualifying withdrawal payments out of the CCF | ​ | ​ | (35.8) | ​ | ​ | (49.9)
Total CCF cash balance at end of period | ​ | ​ | 157.9 | ​ | ​ | 581.4
Accrued interest earned on CCF Cash and Investments at end of period | ​ | ​ | 2.7 | ​ | ​ | 2.5
Total CCF cash and cash equivalents balance at end of period | ​ | ​ | 160.6 | ​ | ​ | 583.9
CCF Investments: | ​ | ​ | ​ | ​ | ​ | ​
CCF investments balance at beginning of period | ​ | ​ | — | ​ | ​ | —
Purchase of U.S. Treasury debt securities | ​ | ​ | 448.1 | ​ | ​ | —
Accretion of investments | ​ | ​ | 5.2 | ​ | ​ | —
Total CCF investments balance at end of period | ​ | ​ | 453.3 | ​ | ​ | —
Total CCF cash and cash equivalents, and investments balance at end of period | ​ | $ | 613.9 | ​ | $ | 583.9
Schedule of maturities of capital construction fund investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | June 30, 2024
Year (in millions) |  | Cost | ​ | Fair Value
Remainder of 2024 | ​ | $ | 47.4 | ​ | $ | 47.3
2025 | ​ |  | 188.0 | ​ |  | 187.1
2026 | ​ |  | 165.7 | ​ |  | 164.4
2027 | ​ |  | 52.2 | ​ |  | 51.8
Total CCF investments | ​ | $ | 453.3 | ​ | $ | 450.6
Schedule of CCF assigned accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended
​ | ​ | June 30,
(In millions) |  | 2024 |  | 2023
CCF assigned accounts receivable balance at beginning of period | ​ | $ | 218.1 | ​ | $ | 9.9
Assigned accounts receivable | ​ | ​ | — | ​ | ​ | 200.0
Repurchase of assigned accounts receivable | ​ | ​ | (35.8) | ​ | ​ | —
Interest earned on assigned accounts receivable | ​ | ​ | 3.6 | ​ | ​ | 0.1
CCF assigned accounts receivable balance at end of period | ​ | $ | 185.9 | ​ | $ | 210.0

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