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CAPITAL CONSTRUCTION FUND - Summary of the activities of the CCF cash and cash equivalents, and investments account (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 29, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 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 | $ 599.4
CCF Investments: |  |  |  |
Purchase of U.S. Treasury debt securities | $ 448.1 | 448.1 |  |
Accretion of investments |  | 8.6 |  |
Total CCF investments balance at end of period |  | 456.7 |  |
Accrued interest earned on Cash and Cash Equivalents at end of period: |  | 2.2 |  | 2.7
Total CCF cash and cash equivalents, and investments balance at end of period |  | $ 635.4 | $ 591.6 | $ 599.4
Weighted average life of securities held within the fund |  | 68 days |  |
Capital construction fund, accrued interest on investments | $ 1.7 |  |  |
Debt security investments maturity term | 3 years |  |  |

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- Definition The amount of accrued interest on cash and cash equivalents and investments 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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- Definition The balance of cash and cash equivalents in capital construction fund. + References No definition available. + Details
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- Definition The amount of cash deposits into 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 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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- 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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