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Employee Benefit Plans (Notes)
 9 Months Ended
Sep. 30, 2022
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,
 2022202120222021
 (in millions)
  
Service cost$0.5 $0.5 $1.4 $1.5 
Interest cost4.1 4.4 12.5 13.0 
Expected asset return(8.0)(9.7)(23.8)(29.1)
Amortized loss2.0 2.7 5.8 8.1 
Net periodic benefit credit$(1.4)$(2.1)$(4.1)$(6.5)
  
 Other Postretirement Benefits
 Three Months EndedNine Months Ended
 September 30,September 30,
 2022202120222021
 (in millions)
   
Service cost$0.1 $— $0.2 $0.2 
Interest cost2.1 2.1 6.3 6.3 
Amortized loss0.2 0.4 0.4 1.2 
Amortized prior service credit(0.3)(0.3)(0.7)(1.1)
Net periodic benefit cost$2.1 $2.2 $6.2 $6.6 

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, 2022 and December 31, 2021, we have a noncurrent pension liability of $113.9 million and $121.3 million, respectively. As of September 30, 2022 and December 31, 2021, we have a noncurrent other postretirement benefits liability of $476.2 million and $481.2 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 2022 to be less than $1 million. We expect our cash payments for other postretirement benefit obligations in 2022, net of GM cost sharing, to be approximately $16.5 million.