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Benefit Plans
 3 Months Ended
Mar. 31, 2023
Pension [Member]  
Entity Information [Line Items]  
Pension and Postretirement Benefits BENEFIT PLANS
The amounts presented in the following tables for pension include both of the Pension Plans. The pension costs below have not been adjusted for amounts billed to the Service Company for former AES Ohio employees who are now employed by the Service Company or other AES affiliates that are still participants in the AES Ohio plan.

The following table presents the net periodic benefit cost of the Pension Plans for the three months ended March 31, 2023 and 2022:
Three months ended
March 31,
$ in millions20232022
Service cost$0.7 $1.3 
Interest cost4.0 2.4 
Expected return on plan assets(4.4)(4.0)
Amortization of unrecognized:
Prior service cost0.2 0.2 
Actuarial loss0.2 1.4 
Net periodic benefit cost$0.7 $1.3 

The components of net periodic (benefit) / cost other than service cost are included in Other income, net in the Condensed Consolidated Statements of Operations.

There were $7.5 million in employer contributions during each of the three months ended March 31, 2023 and 2022.

In addition, AES Ohio provides postretirement health care and life insurance benefits to certain retired employees, their spouses and eligible dependents. We have funded a portion of the union-eligible benefits using a Voluntary Employee Beneficiary Association Trust. These postretirement health care benefits and the related unfunded obligation of $7.1 million and $7.0 million as of March 31, 2023 and December 31, 2022, respectively, were not material to the financial statements in the periods covered by this report.
Subsidiaries [Member]  
Entity Information [Line Items]  
Pension and Postretirement Benefits BENEFIT PLANS
The amounts presented in the following tables for pension include both of the Pension Plans. The pension costs below have not been adjusted for amounts billed to the Service Company for former AES Ohio employees who are now employed by the Service Company or other AES affiliates or for amounts billed to AES Ohio Generation for former employees that were employed by AES Ohio Generation that are still participants in the AES Ohio plan.

The following table presents the net periodic benefit cost of the Pension Plans for the three months ended March 31, 2023 and 2022:
Three months ended
March 31,
$ in millions20232022
Service cost$0.7 $1.3 
Interest cost4.0 2.4 
Expected return on plan assets(4.4)(4.0)
Amortization of unrecognized:
Prior service cost0.3 0.3 
Actuarial loss0.3 1.9 
Net periodic benefit cost$0.9 $1.9 
The components of net periodic (benefit) / cost other than service cost are included in Other income / (expense), net: in the Condensed Statements of Operations.

There were $7.5 million in employer contributions during each of the three months ended March 31, 2023 and 2022.

In addition, AES Ohio provides postretirement health care and life insurance benefits to certain retired employees, their spouses and eligible dependents. We have funded a portion of the union-eligible benefits using a Voluntary Employee Beneficiary Association Trust. These postretirement health care benefits and the related unfunded obligation of $7.1 million and $7.0 million as of March 31, 2023 and December 31, 2022, respectively, were not material to the financial statements in the periods covered by this report.