Equity (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Sep. 30, 2026 |
Jun. 30, 2026 |
Mar. 31, 2026 |
Sep. 30, 2025 |
Jun. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
Apr. 04, 2025 |
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| Stockholders' Equity Note Disclosure | SHAREHOLDER'S EQUITY Capital Contributions and Distributions During the nine months ended September 30, 2026 and 2025, AES Ohio received parent equity contributions totaling $125.0 million and $150.0 million, respectively. The proceeds from these equity contributions are primarily for funding needs related to AES Ohio's capital expenditure program. Agreement to Sell Minority Interest in AES Ohio On April 4, 2025, DPL sold an aggregate indirect equity interest in AES Ohio of approximately 30% to Astrid Holdings LP, a wholly-owned subsidiary of La Caisse. Prior to the transaction closing, DPL contributed to AES Ohio Holdings, Inc. (“Ohio Holdings”) 100% of the issued and outstanding shares of AES Ohio, such that Ohio Holdings owns 100% of AES Ohio. There is no change in management or operational control of DPL or AES Ohio as a result of the transaction. Prior to the transaction with La Caisse described above, DPL owned all of the outstanding common stock of AES Ohio. AOCL The changes in the components of AOCL during the nine months ended September 30, 2026 are as follows:
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| Proceeds from Contributions from Parent | $ 125.0 | $ 150.0 | $ 125.0 | $ 150.0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stockholders' Equity, Other | (0.1) | $ 0.1 | $ 0.1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accumulated other comprehensive income | $ (21.1) | (21.1) | $ (22.3) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, after Tax | $ 0.4 | $ 0.5 | $ 1.2 | $ 1.5 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| CDPQ Investment percent | 30.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ohio Holdings Investment Percent | 100.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Proceeds from Contributions from Parent | $ 150.0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stockholders' Equity, Other | $ (0.1) | $ 0.1 | $ 0.1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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- Definition CDPQ Investment Percent No definition available.
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- Definition Ohio Holdings Investment Percent No definition available.
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- Definition Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The cash inflow from parent as a source of financing that is recorded as additional paid in capital. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The entire disclosure for equity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Details
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