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Benefit Plans
 3 Months Ended
Mar. 31, 2022
Pension [Member]  
Entity Information [Line Items]  
Pension and Postretirement Benefits Benefit Plans
AES Ohio sponsors a defined benefit pension plan for the majority of its employees.

We generally fund pension plan benefits as accrued in accordance with the minimum funding requirements of ERISA and, in addition, make voluntary contributions from time to time. There were $7.5 million and $9.8 million in employer contributions during the three months ended March 31, 2022 and 2021, respectively.

The amounts presented in the following tables for pension include the collective bargaining plan formula, the traditional management plan formula, the cash balance plan formula and the SERP, in the aggregate. 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 components of net periodic benefit costs other than service costs are included in Other income in the Condensed Consolidated Statements of Operations.

The net periodic benefit cost of the pension benefit plans for the three months ended March 31, 2022 and 2021 was:
Three months ended
March 31,
$ in millions20222021
Service cost$1.3 $1.1 
Interest cost2.4 2.0 
Expected return on plan assets(4.0)(3.7)
Amortization of unrecognized:
Prior service cost0.2 0.2 
Actuarial loss1.4 2.3 
Net periodic benefit cost$1.3 $1.9 

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 $8.8 million as of March 31, 2022 and $8.9 million as of December 31, 2021 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
AES Ohio sponsors a defined benefit pension plan for the majority of its employees.

We generally fund pension plan benefits as accrued in accordance with the minimum funding requirements of ERISA and, in addition, make voluntary contributions from time to time. There were $7.5 million and $9.8 million in employer contributions during the three months ended March 31, 2022 and 2021, respectively.

The amounts presented in the following tables for pension include the collective bargaining plan formula, the traditional management plan formula, the cash balance plan formula and the SERP, in the aggregate. 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 components of net periodic benefit costs other than service costs are included in Other expense in the Condensed Statements of Operations.


The net periodic benefit cost of the pension benefit plans for the three months ended March 31, 2022 and 2021 was:
Three months ended
March 31,
$ in millions20222021
Service cost$1.3 $1.1 
Interest cost2.4 2.0 
Expected return on plan assets(4.0)(3.7)
Amortization of unrecognized:
Prior service cost0.3 0.3 
Actuarial loss1.9 2.8 
Net periodic benefit cost$1.9 $2.5 

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 $8.8 million as of March 31, 2022 and $8.9 million as of December 31, 2021 were not material to the financial statements in the periods covered by this report.