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Employee Benefit Plans (Notes)
 6 Months Ended
Jun. 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 EndedSix Months Ended
 June 30,June 30,
 2023202220232022
 (in millions)
  
Service cost$0.2 $0.4 $0.5 $0.9 
Interest cost6.1 4.2 12.1 8.4 
Expected asset return(7.3)(7.8)(14.5)(15.8)
Amortized loss1.1 1.9 2.1 3.8 
Net periodic benefit cost (credit)$0.1 $(1.3)$0.2 $(2.7)
  
 Other Postretirement Benefits
 Three Months EndedSix Months Ended
 June 30,June 30,
 2023202220232022
 (in millions)
   
Service cost$0.1 $— $0.1 $0.1 
Interest cost2.5 2.1 5.0 4.2 
Amortized loss (gain)(2.1)0.1 (4.2)0.2 
Amortized prior service credit(0.1)(0.2)(0.2)(0.4)
Net periodic benefit cost$0.4 $2.0 $0.7 $4.1 

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, 2023 and December 31, 2022, we have a noncurrent pension liability of $69.6 million and $73.5 million, respectively. As of June 30, 2023 and December 31, 2022, we have a noncurrent other postretirement benefits liability of $302.0 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.