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CAPITAL CONSTRUCTION FUND - Summary of the activities within the CCF cash and cash equivalents, and investments account (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 29, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 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 |  | 20.3 |  |
Interest income on cash and cash equivalents, and CCF investments |  | 4.1 | 7.2 |
Repurchase of assigned accounts receivable |  | 100.7 |  |
Qualifying withdrawal payments out of the CCF |  | (65.0) |  |
Total CCF cash and cash equivalents balance at end of period |  | 290.8 | 156.8 |
CCF Investments: |  |  |  |
CCF investments balance at beginning of period |  | 411.9 |  |
Purchase of U.S. Treasury debt securities | $ 448.1 |  | 448.1 |
Withdrawals of U.S. Treasury debt securities at maturity |  | (20.3) |  |
Accretion of investments |  | 3.0 | 1.9 |
Total CCF investments balance at end of period |  | 394.6 | 450.0 |
Total CCF cash and cash equivalents, and investments balance at end of period |  | $ 685.4 | $ 606.8 | $ 642.6
Weighted average life of securities held within the fund |  | 89 days |  |
Capital construction fund, accrued interest on investments | $ 1.7 |  |  |
Debt security investments maturity term |  | 2 years |  |

X
- Definition The amount of accretion of investments made under capital construction fund. + References No definition available. + Details
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- Definition The amount of accrued interest on investments made under capital construction fund. + References No definition available. + Details
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- Definition The balance of cash in capital construction fund. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The carrying value of cash and cash equivalents and investments in capital construction fund. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt securities, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The amount of interest on deposits and investments in capital construction fund. + References No definition available. + Details
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- Definition Cost of capital construction fund investments maturing maturing in third fiscal year following current fiscal year. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The amount of cash paid for purchase for investments along with accrued interest from capital construction fund. + References No definition available. + Details
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- Definition The amount of increase in capital construction fund due to cash inflow from investments at maturity. + References No definition available. + Details
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- Definition Purchase of investments under capital construction fund. + References No definition available. + Details
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- Definition Amount of decrease in capital construction fund due to withdrawal of investment at maturity. + References No definition available. + Details
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- Definition The amount of decrease in capital construction fund cash and cash equivalents due to qualifying withdrawal payments. + References No definition available. + Details
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- Definition The amount of increase in capital construction fund cash and cash equivalents due to repurchase of assigned accounts receivable. + References No definition available. + Details
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- Definition Weighted average life of securities held within the fund, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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