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CAPITAL CONSTRUCTION FUND (Tables) | 6 Months Ended
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Jun. 30, 2025
CAPITAL CONSTRUCTION FUND |
Schedule of capital construction fund | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended
​ | ​ | June 30,
(In millions) |  | 2025 |  | 2024
CCF Cash and Cash Equivalents: | ​ | ​ | ​ | ​ | ​ | ​
CCF cash and cash equivalents balance at beginning of period | ​ | $ | 230.7 | ​ | $ | 599.4
Cash withdrawal for the purchase of U.S. Treasury debt securities and accrued interest | ​ | ​ | — | ​ | ​ | (449.8)
Proceeds from U.S. Treasury debt securities at maturity | ​ | ​ | 91.1 | ​ | ​ | —
Interest income on cash and cash equivalents, and CCF investments | ​ | ​ | 8.3 | ​ | ​ | 11.0
Repurchase of assigned accounts receivable | ​ | ​ | 100.7 | ​ | ​ | 35.8
Qualifying withdrawal payments for vessel construction expenditures | ​ | ​ | (100.7) | ​ | ​ | (35.8)
Total CCF cash and cash equivalents balance at end of period | ​ | ​ | 330.1 | ​ | ​ | 160.6
​ | ​ | ​ | ​ | ​ | ​ | ​
CCF Investments: | ​ | ​ | ​ | ​ | ​ | ​
CCF investments balance at beginning of period | ​ | ​ | 411.9 | ​ | ​ | —
Purchase of U.S. Treasury debt securities | ​ | ​ | — | ​ | ​ | 448.1
Sale of U.S. Treasury debt securities at maturity | ​ | ​ | (91.1) | ​ | ​ | —
Accretion of investments | ​ | ​ | 5.8 | ​ | ​ | 5.2
Total CCF investments balance at end of period | ​ | ​ | 326.6 | ​ | ​ | 453.3
Total CCF cash and cash equivalents, and investments balance at end of period | ​ | $ | 656.7 | ​ | $ | 613.9
Schedule of maturities of capital construction fund investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | June 30, 2025
Year (in millions) |  | Cost | ​ | Fair Value
Remainder of 2025 | ​ | $ | 103.7 | ​ | $ | 103.7
2026 | ​ |  | 170.5 | ​ |  | 171.0
2027 | ​ |  | 52.4 | ​ |  | 52.7
Total CCF investments | ​ | $ | 326.6 | ​ | $ | 327.4

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