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Employee Benefit Plans (Notes)
 6 Months Ended
Jun. 30, 2021
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,
 2021202020212020
 (in millions)
  
Service cost$0.5 $0.5 $1.0 $1.0 
Interest cost4.3 5.4 8.6 10.8 
Expected asset return(9.7)(9.7)(19.4)(19.3)
Amortized loss2.7 2.2 5.4 4.3 
Net periodic benefit credit$(2.2)$(1.6)$(4.4)$(3.2)
  
 Other Postretirement Benefits
 Three Months EndedSix Months Ended
 June 30,June 30,
 2021202020212020
 (in millions)
   
Service cost$0.1 $0.1 $0.2 $0.2 
Interest cost2.1 2.5 4.2 5.1 
Amortized loss0.4 0.3 0.8 0.5 
Amortized prior service credit(0.4)(0.4)(0.8)(0.8)
Net periodic benefit cost$2.2 $2.5 $4.4 $5.0 

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, 2021 and December 31, 2020, we have a noncurrent pension liability of $130.4 million and $141.2 million, respectively. As of June 30, 2021 and December 31, 2020, we have a noncurrent other postretirement benefits liability of $552.8 million and $556.7 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 2021 to be less than $1 million. We expect our cash payments for other postretirement benefit obligations in 2021, net of GM cost sharing, to be approximately $17 million.