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Employee Benefit Plans (Notes)
 9 Months Ended
Sep. 30, 2023
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 EndedNine Months Ended
 September 30,September 30,
 2023202220232022
 (in millions)
  
Service cost$0.3 $0.5 $0.8 $1.4 
Interest cost6.1 4.1 18.2 12.5 
Expected asset return(7.3)(8.0)(21.8)(23.8)
Amortized loss1.0 2.0 3.1 5.8 
Net periodic benefit cost (credit)$0.1 $(1.4)$0.3 $(4.1)
  
 Other Postretirement Benefits
 Three Months EndedNine Months Ended
 September 30,September 30,
 2023202220232022
 (in millions)
   
Service cost$— $0.1 $0.1 $0.2 
Interest cost2.6 2.1 7.6 6.3 
Amortized loss (gain)(2.1)0.2 (6.3)0.4 
Amortized prior service credit(0.2)(0.3)(0.4)(0.7)
Net periodic benefit cost$0.3 $2.1 $1.0 $6.2 

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, 2023 and December 31, 2022, we have a noncurrent pension liability of $67.3 million and $73.5 million, respectively. As of September 30, 2023 and December 31, 2022, we have a noncurrent other postretirement benefits liability of $301.1 million and $304.8 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 2023 to be less than $1.0 million. We expect our cash payments for other postretirement benefit obligations in 2023, net of GM cost sharing, to be approximately $14.6 million.