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Employee Benefit Plans (Notes)
 9 Months Ended
Sep. 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 EndedNine Months Ended
 September 30,September 30,
 2025202420252024
 (in millions)
  
Service cost$0.1 $0.3 $0.2 $0.8 
Interest cost5.9 5.8 17.9 17.4 
Expected asset return(6.4)(7.2)(19.2)(21.5)
Amortized loss2.2 1.7 6.5 5.1 
Net periodic benefit cost$1.8 $0.6 $5.4 $1.8 
  
 Other Postretirement Benefits
 Three Months EndedNine Months Ended
 September 30,September 30,
 2025202420252024
 (in millions)
   
Service cost$0.1 $— $0.1 $0.1 
Interest cost2.3 2.1 6.8 6.3 
Amortized gain(2.4)(2.5)(7.1)(7.5)
Amortized prior service credit(0.2)(0.1)(0.5)(0.3)
Net periodic benefit credit$(0.2)$(0.5)$(0.7)$(1.4)

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 September 30, 2025 and December 31, 2024, we have a noncurrent pension liability of $77.6 million and $78.3 million, respectively. As of September 30, 2025 and December 31, 2024, we have a noncurrent other postretirement benefits liability of $264.0 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.