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Employee Benefit Plans (Notes)
 6 Months Ended
Jun. 30, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block]
8. 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,
 2024202320242023
 (in millions)
  
Service cost$0.2 $0.2 $0.5 $0.5 
Interest cost5.8 6.1 11.6 12.1 
Expected asset return(7.1)(7.3)(14.3)(14.5)
Amortized loss1.7 1.1 3.4 2.1 
Net periodic benefit cost$0.6 $0.1 $1.2 $0.2 
  
 Other Postretirement Benefits
 Three Months EndedSix Months Ended
 June 30,June 30,
 2024202320242023
 (in millions)
   
Service cost$0.1 $0.1 $0.1 $0.1 
Interest cost2.1 2.5 4.2 5.0 
Amortized gain(2.5)(2.1)(5.0)(4.2)
Amortized prior service credit(0.1)(0.1)(0.2)(0.2)
Net periodic benefit cost (credit)$(0.4)$0.4 $(0.9)$0.7 

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, 2024 and December 31, 2023, we have a noncurrent pension liability of $70.5 million and $74.7 million, respectively. As of June 30, 2024 and December 31, 2023, we have a noncurrent other postretirement benefits liability of $267.1 million and $268.9 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 2024 to be less than $1.0 million. We expect our cash payments for other postretirement benefit obligations in 2024, net of GM cost sharing, to be approximately $11.0 million.