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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2023
Related Party Transaction [Line Items]  
Allowance For Funds Used During Construction / Capitalized Interest
AES Ohio capitalizes an allowance for the net cost of funds (interest on borrowed funds and a reasonable rate of return on equity funds) used for construction purposes during the period of construction with a corresponding credit to income. During the three and nine months ended September 30, 2023 and 2022, AFUDC equity and AFUDC debt were as follows:
Three months endedNine months ended
September 30,September 30,
$ in millions2023202220232022
AFUDC equity$1.3 $2.0 $3.8 $4.0 
AFUDC debt$1.6 $(0.4)$4.5 $0.8 
Schedule of Accumulated Other Comprehensive Income (Loss)
The changes in the components of AOCL during the nine months ended September 30, 2023 are as follows:
$ in millionsChange in cash flow hedgesChange in unfunded pension and other postretirement obligationsTotal
Balance as of January 1, 2023$12.0 $(14.4)$(2.4)
Amounts reclassified from AOCL to earnings(0.6)0.1 (0.5)
Balance as of September 30, 2023$11.4 $(14.3)$(2.9)
Reclassification out of Accumulated Other Comprehensive Income
The amounts reclassified out of AOCL by component during the three and nine months ended September 30, 2023 and 2022 are as follows:
Details about AOCL componentsAffected line item in the Condensed Consolidated Statements of OperationsThree months endedNine months ended
September 30,September 30,
$ in millions2023202220232022
Net gains on cash flow hedges (Note 4):
Interest expense$(0.2)$(0.2)$(0.7)$(0.7)
Income tax effect— 0.1 0.1 0.2 
Net of income taxes(0.2)(0.1)(0.6)(0.5)
Amortization of unfunded pension and other postretirement obligations (Note 7):
Other expense— 0.3 0.1 0.9 
Income tax effect— (0.1)— (0.2)
Net of income taxes— 0.2 0.1 0.7 
Total reclassifications for the period, net of income taxes$(0.2)$0.1 $(0.5)$0.2 
Schedule of Supplemental Financial Information
The following table summarizes accounts receivable as of September 30, 2023 and December 31, 2022:
September 30,December 31,
$ in millions20232022
Accounts receivable, net:
Customer receivables$60.4 $61.3 
Unbilled revenue15.8 24.0 
Amounts due from affiliates 1.0 3.2 
Other8.9 3.9 
Allowance for credit losses(1.0)(0.5)
Total accounts receivable, net$85.1 $91.9 
Accounts Receivable, Allowance for Credit Loss
The following table is a roll forward of our allowance for credit losses related to the accounts receivable balances for the nine months ended September 30, 2023 and 2022:
September 30,September 30,
$ in millions20232022
Allowance for credit losses:
Beginning balance$0.5 $0.3 
Current period provision4.1 1.4 
Write-offs charged against allowances(4.4)(2.1)
Recoveries collected0.8 0.8 
Ending balance$1.0 $0.4 
New Accounting Pronouncements, Policy [Policy Text Block]
New Accounting Pronouncements Adopted in 2023
We have assessed and determined that the new accounting pronouncements adopted did not have a material impact on our consolidated financial statements.

New Accounting Pronouncements Issued But Not Yet Effective
The following table provides a brief description of recent accounting pronouncements that could have a material impact on our consolidated financial statements. Accounting pronouncements not listed below were assessed and determined to be either not applicable or are expected to have no material impact on our consolidated financial statements.
Schedule of Cash and Cash Equivalents [Table Text Block]
The following table summarizes cash, cash equivalents, and restricted cash amounts reported on the Condensed Consolidated Balance Sheets that reconcile to the total of such amounts as shown on the Condensed Consolidated Statements of Cash Flows:
$ in millionsSeptember 30, 2023December 31, 2022
Cash and cash equivalents$49.3 $30.5 
Restricted cash (included in Prepayments and other current assets)
0.1 0.1 
Cash, Cash Equivalents, and Restricted Cash, End of Period$49.4 $30.6 
Schedule of New Accounting Pronouncements
New Accounting Pronouncements Issued But Not Yet Effective
The following table provides a brief description of recent accounting pronouncements that could have a material impact on our consolidated financial statements. Accounting pronouncements not listed below were assessed and determined to be either not applicable or are expected to have no material impact on our consolidated financial statements.
Subsidiaries [Member]  
Related Party Transaction [Line Items]  
Allowance For Funds Used During Construction / Capitalized Interest
AFUDC
AES Ohio capitalizes an allowance for the net cost of funds (interest on borrowed funds and a reasonable rate of return on equity funds) used for construction purposes during the period of construction with a corresponding credit to income. During the three and nine months ended September 30, 2023 and 2022, AFUDC equity and AFUDC debt were as follows:
Three months endedNine months ended
September 30,September 30,
$ in millions2023202220232022
AFUDC equity$1.3 $2.0 $3.8 $4.0 
AFUDC debt$1.6 $(0.4)$4.5 $0.8 
Schedule of Accumulated Other Comprehensive Income (Loss)
The changes in the components of AOCL during the nine months ended September 30, 2023 are as follows:
$ in millionsChange in Accumulated other comprehensive loss
Balance as of January 1, 2023$(26.8)
Amounts reclassified from AOCL to earnings0.3 
Balance as of September 30, 2023$(26.5)
Reclassification out of Accumulated Other Comprehensive Income AOCL by component during the three and nine months ended September 30, 2023 and 2022 are as follows:
Details about AOCL componentsAffected line item in the Condensed Statements of OperationsThree months endedNine months ended
September 30,September 30,
$ in millions2023202220232022
Amortization of unfunded pension and other postretirement obligations (Note 6):
Other expense$0.2 $0.8 $0.5 $2.6 
Income tax effect(0.1)(0.2)(0.2)(0.6)
Net of income taxes0.1 0.6 0.3 2.0 
Total reclassifications for the period, net of income taxes$0.1 $0.6 $0.3 $2.0 
Schedule of Supplemental Financial Information
The following table summarizes accounts receivable as of September 30, 2023 and December 31, 2022:
September 30,December 31,
$ in millions20232022
Accounts receivable, net:
Customer receivables$59.2 $60.6 
Unbilled revenue15.8 24.0 
Amounts due from affiliates 1.5 4.4 
Other9.0 3.8 
Allowance for credit losses(1.0)(0.5)
Total accounts receivable, net$84.5 $92.3 
Accounts Receivable, Allowance for Credit Loss
The following table is a roll forward of our allowance for credit losses related to the accounts receivable balances for the nine months ended September 30, 2023 and 2022:
September 30,September 30,
$ in millions20232022
Allowance for credit losses:
Beginning balance$0.5 $0.3 
Current period provision4.1 1.4 
Write-offs charged against allowances(4.4)(2.1)
Recoveries collected0.8 0.8 
Ending balance$1.0 $0.4 
New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements Adopted in 2023 We have assessed and determined that the new accounting pronouncements adopted did not have a material impact on our financial statements.
New Accounting Pronouncements Issued But Not Yet Effective
The following table provides a brief description of recent accounting pronouncements that could have a material impact on our consolidated financial statements. Accounting pronouncements not listed below were assessed and determined to be either not applicable or are expected to have no material impact on our consolidated financial statements.

ASU Number and NameDescriptionDate of AdoptionEffect on the financial statements upon adoption
2023-06 Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification InitiativeIn U.S. Securities and Exchange Commission (SEC) Release No. 33-10532, Disclosure Update and Simplification, issued August 17, 2018, the SEC referred certain of its disclosure requirements that overlap with, but require incremental information to, generally accepted accounting principles (GAAP) to the FASB for potential incorporation into the Codification. The amendments in this Update are the result of the Board’s decision to incorporate into the Codification 14 of the 27 disclosures referred by the SEC.

The amendments in this Update represent changes to clarify or improve disclosure and presentation requirements of a variety of Topics. Many of the amendments allow users to more easily compare entities subject to the SEC’s existing disclosures with those entities that were not previously subject to the SEC’s requirements. Also, the amendments align the requirements in the Codification with the SEC’s regulations.		The effective date for each amendment will be the date on which the SEC's removal of that related disclosure becomes effective, with early adoption prohibited.We are currently evaluating the impact of adopting the standard on our condensed financial statements.
Schedule of Cash and Cash Equivalents [Table Text Block]
The following table summarizes cash, cash equivalents, and restricted cash amounts reported on the Condensed Balance Sheets that reconcile to the total of such amounts as shown on the Condensed Statements of Cash Flows:
$ in millionsSeptember 30, 2023December 31, 2022
Cash and cash equivalents$33.0 $19.7 
Restricted cash (included in Prepayments and other current assets)
0.1 0.1 
Cash, Cash Equivalents, and Restricted Cash, End of Period$33.1 $19.8