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CAPITAL CONSTRUCTION FUND (Tables) | 9 Months Ended
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Sep. 30, 2024
CAPITAL CONSTRUCTION FUND |
Schedule of capital construction fund | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended
​ | ​ | September 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 | ​ | ​ | 50.0 | ​ | ​ | 100.0
Cash paid for purchase of U.S. Treasury debt securities and accrued interest | ​ | ​ | (449.8) | ​ | ​ | —
Interest income deposited into the CCF | ​ | ​ | 15.4 | ​ | ​ | 20.8
Qualifying withdrawal payments out of the CCF | ​ | ​ | (35.8) | ​ | ​ | (49.9)
Total CCF cash balance at end of period | ​ | ​ | 176.5 | ​ | ​ | 589.1
Accrued interest earned on CCF Cash and Investments at end of period | ​ | ​ | 2.2 | ​ | ​ | 2.5
Total CCF cash and cash equivalents balance at end of period | ​ | ​ | 178.7 | ​ | ​ | 591.6
CCF Investments: | ​ | ​ | ​ | ​ | ​ | ​
CCF investments balance at beginning of period | ​ | ​ | — | ​ | ​ | —
Purchase of U.S. Treasury debt securities | ​ | ​ | 448.1 | ​ | ​ | —
Accretion of investments | ​ | ​ | 8.6 | ​ | ​ | —
Total CCF investments balance at end of period | ​ | ​ | 456.7 | ​ | ​ | —
Total CCF cash and cash equivalents, and investments balance at end of period | ​ | $ | 635.4 | ​ | $ | 591.6
Schedule of maturities of capital construction fund investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | September 30, 2024
Year (in millions) |  | Cost | ​ | Fair Value
Remainder of 2024 | ​ | $ | 47.8 | ​ | $ | 47.8
2025 | ​ |  | 189.8 | ​ |  | 190.5
2026 | ​ |  | 166.9 | ​ |  | 168.6
2027 | ​ |  | 52.2 | ​ |  | 53.0
Total CCF investments | ​ | $ | 456.7 | ​ | $ | 459.9
Schedule of CCF assigned accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended
​ | ​ | September 30,
(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 | ​ | ​ | 10.2 | ​ | ​ | 3.3
CCF assigned accounts receivable balance at end of period | ​ | $ | 228.3 | ​ | $ | 213.2

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