v3.25.2
Employee Benefit Plans (Notes)
6 Months Ended
Jun. 30, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block]
9. EMPLOYEE BENEFIT PLANS

The components of net periodic benefit cost (credit) are as follows:
 Pension Benefits
 Three Months EndedSix Months Ended
 June 30,June 30,
 2025202420252024
 (in millions)
  
Service cost$ $0.2 $0.1 $0.5 
Interest cost6.0 5.8 12.0 11.6 
Expected asset return(6.4)(7.1)(12.8)(14.3)
Amortized loss2.2 1.7 4.3 3.4 
Net periodic benefit cost$1.8 $0.6 $3.6 $1.2 
  
 Other Postretirement Benefits
 Three Months EndedSix Months Ended
 June 30,June 30,
 2025202420252024
 (in millions)
   
Service cost$ $0.1 $ $0.1 
Interest cost2.2 2.1 4.5 4.2 
Amortized gain(2.4)(2.5)(4.7)(5.0)
Amortized prior service credit(0.1)(0.1)(0.3)(0.2)
Net periodic benefit credit$(0.3)$(0.4)$(0.5)$(0.9)

The noncurrent liabilities associated with our pension and other postretirement benefit plans are classified as Postretirement benefits and other long-term liabilities on our Condensed Consolidated Balance Sheets. As of June 30, 2025 and December 31, 2024, we have a noncurrent pension liability of $78.8 million and $78.3 million, respectively. As of June 30, 2025 and December 31, 2024, we have a noncurrent other postretirement benefits liability of $265.0 million and $265.3 million, respectively.

Due to the availability of our pre-funded pension balances (previous contributions in excess of prior required pension contributions), we expect our regulatory pension funding requirements in 2025 to be approximately $1.1 million. We expect our cash payments for other postretirement benefit obligations in 2025, net of GM cost sharing, to be approximately $11.6 million.