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Employee Benefit Plans (Notes)
 6 Months Ended
Jun. 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 EndedSix Months Ended
 June 30,June 30,
 2022202120222021
 (in millions)
  
Service cost$0.4 $0.5 $0.9 $1.0 
Interest cost4.2 4.3 8.4 8.6 
Expected asset return(7.8)(9.7)(15.8)(19.4)
Amortized loss1.9 2.7 3.8 5.4 
Net periodic benefit credit$(1.3)$(2.2)$(2.7)$(4.4)
  
 Other Postretirement Benefits
 Three Months EndedSix Months Ended
 June 30,June 30,
 2022202120222021
 (in millions)
   
Service cost$— $0.1 $0.1 $0.2 
Interest cost2.1 2.1 4.2 4.2 
Amortized loss0.1 0.4 0.2 0.8 
Amortized prior service credit(0.2)(0.4)(0.4)(0.8)
Net periodic benefit cost$2.0 $2.2 $4.1 $4.4 

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 June 30, 2022 and December 31, 2021, we have a noncurrent pension liability of $119.3 million and $121.3 million, respectively. As of June 30, 2022 and December 31, 2021, we have a noncurrent other postretirement benefits liability of $478.3 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.