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Employee Benefit Plans (Notes)
 9 Months Ended
Sep. 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 EndedNine Months Ended
 September 30,September 30,
 2021202020212020
 (in millions)
  
Service cost$0.5 $0.5 $1.5 $1.5 
Interest cost4.4 5.4 13.0 16.2 
Expected asset return(9.7)(9.6)(29.1)(28.9)
Amortized loss2.7 2.1 8.1 6.4 
Net periodic benefit credit$(2.1)$(1.6)$(6.5)$(4.8)
  
 Other Postretirement Benefits
 Three Months EndedNine Months Ended
 September 30,September 30,
 2021202020212020
 (in millions)
   
Service cost$— $0.1 $0.2 $0.3 
Interest cost2.1 2.6 6.3 7.7 
Amortized loss0.4 0.3 1.2 0.8 
Amortized prior service credit(0.3)(0.4)(1.1)(1.2)
Net periodic benefit cost$2.2 $2.6 $6.6 $7.6 

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, 2021 and December 31, 2020, we have a noncurrent pension liability of $125.0 million and $141.2 million, respectively. As of September 30, 2021 and December 31, 2020, we have a noncurrent other postretirement benefits liability of $549.8 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.