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Overview and Summary of Significant Accounting Policies Overview and Summary of Significant Accounting Polices (Tables)
 12 Months Ended
Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Accounts, Notes, Loans and Financing Receivable
The following table summarizes accounts receivable as of December 31, 2022 and 2021:
December 31,
$ in millions20222021
Accounts receivable, net
Customer receivables$61.3 $42.3 
Unbilled revenues24.0 19.2 
Amounts due from affiliates3.2 3.1 
Other3.9 7.2 
Allowance for credit losses(0.5)(0.3)
Total accounts receivable, net$91.9 $71.5 
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The changes in the components of Accumulated other comprehensive loss during the years ended December 31, 2022 and 2021 are as follows:
$ in millionsGains / (losses) on cash flow hedgesChange in unfunded pension and other postretirement obligationsTotal
Balance at January 1, 2021$13.6 $(25.9)$(12.3)
Other comprehensive income before reclassifications— 6.4 6.4 
Amounts reclassified from accumulated other comprehensive loss to earnings(0.8)1.9 1.1 
Net current period other comprehensive income / (loss)(0.8)8.3 7.5 
Balance at December 31, 202112.8 (17.6)(4.8)
Other comprehensive income before reclassifications— 2.2 2.2 
Amounts reclassified from accumulated other comprehensive loss to earnings(0.8)1.0 0.2 
Net current period other comprehensive income / (loss)(0.8)3.2 2.4 
Balance at December 31, 2022$12.0 $(14.4)$(2.4)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The amounts reclassified out of Accumulated other comprehensive loss by component during the years ended December 31, 2022, 2021 and 2020 are as follows:
Details about AOCL ComponentsAffected line in the Consolidated Statements of OperationsYears ended December 31,
$ in millions202220212020
Gains and losses on cash flow hedges (Note 5):
Interest expense(1.0)(1.0)(1.1)
Income tax effect0.2 0.2 0.2 
Net of income taxes(0.8)(0.8)(0.9)
Amortization of unfunded pension and other postretirement obligations (Note 8):
Other expense1.3 2.5 1.3 
Income tax effect(0.3)(0.6)(0.3)
Net of income taxes1.0 1.9 1.0 
Total reclassifications for the period, net of income taxes$0.2 $1.1 $0.1 
Accounts Receivable, Allowance for Credit Loss
The following table is a rollforward of our allowance for credit losses related to the accounts receivable balances for the years ended December 31, 2022 and 2021:
$ in millionsBeginning Allowance BalanceCurrent Period ProvisionWrite-offs Charged Against AllowanceRecoveries CollectedEnding Allowance Balance
2022$0.3 $2.5 $(4.1)$1.8 $0.5 
2021$2.8 $(0.4)$(3.5)$1.4 $0.3 
Schedule of Cash and Cash Equivalents [Table Text Block]
The following table summarizes cash, cash equivalents and restricted cash amounts reported within the Consolidated Balance Sheets that reconcile to the total of such amounts as shown on the Consolidated Statements of Cash Flows:
December 31,
$ in millions20222021
Cash and cash equivalents$30.5 $26.6 
Restricted cash (included in Prepayments and other current assets)
0.1 0.1 
Cash, Cash Equivalents and Restricted Cash, End of Period$30.6 $26.7 
THE DAYTON POWER AND LIGHT COMPANY [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Accounts, Notes, Loans and Financing Receivable
The following table summarizes accounts receivable as of December 31, 2022 and 2021:
December 31,
$ in millions20212020
Accounts receivable, net
Customer receivables$60.6 $41.6 
Unbilled revenues24.0 19.2 
Amounts due from affiliates4.4 4.4 
Other3.8 7.0 
Allowance for credit losses(0.5)(0.3)
Total accounts receivable, net$92.3 $71.9 
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
$ in millionsChange in Accumulated other comprehensive loss
Balance at January 1, 2021$(42.1)
Other comprehensive income before reclassifications6.4 
Amounts reclassified from accumulated other comprehensive loss to earnings3.9 
Net current period other comprehensive income10.3 
Balance at December 31, 2021(31.8)
Other comprehensive income before reclassifications2.3 
Amounts reclassified from accumulated other comprehensive loss to earnings2.7 
Net current period other comprehensive income5.0 
Balance at December 31, 2022$(26.8)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The amounts reclassified out of Accumulated other comprehensive loss by component during the years ended December 31, 2022, 2021 and 2020 are as follows:
Details about AOCL ComponentsAffected line in the Statements of OperationsYears ended December 31,
$ in millions202220212020
Gains and losses on cash flow hedges:
Interest expense$— $— $(0.2)
Income tax effect— — 0.8 
Net of income taxes— — 0.6 
Amortization of unfunded pension and other postretirement obligations (Note 7):
Other expense3.6 5.0 4.0 
Income tax effect(0.9)(1.1)(0.9)
Net of income taxes2.7 3.9 3.1 
Total reclassifications for the period, net of income taxes$2.7 $3.9 $3.7 
Accounts Receivable, Allowance for Credit Loss
The following table is a rollforward of our allowance for credit losses related to the accounts receivable balances for the years ended December 31, 2022 and 2021:
$ in millionsBeginning Allowance BalanceCurrent Period ProvisionWrite-offs Charged Against AllowanceRecoveries CollectedEnding Allowance Balance
2022$0.3 $2.5 $(4.1)$1.8 $0.5 
2021$2.8 $(0.4)$(3.5)$1.4 $0.3 
Schedule of Cash and Cash Equivalents [Table Text Block]
The following table summarizes cash, cash equivalents and restricted cash amounts reported within the Balance Sheets that reconcile to the total of such amounts as shown on the Statements of Cash Flows:
December 31,
$ in millions20222021
Cash and cash equivalents$19.7 $14.4 
Restricted cash (included in Prepayments and other current assets)
0.1 0.1 
Cash, Cash Equivalents and Restricted Cash, End of Period$19.8 $14.5