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Employee Benefit Plans (Notes)
 3 Months Ended
Mar. 31, 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 Ended
 March 31,
 20232022
 (in millions)
 
Service cost$0.3 $0.5 
Interest cost6.0 4.2 
Expected asset return(7.2)(8.0)
Amortized loss1.0 1.9 
Net periodic benefit cost (credit)$0.1 $(1.4)
 
 Other Postretirement Benefits
 Three Months Ended
 March 31,
 20232022
 (in millions)
 
Service cost$— $0.1 
Interest cost2.5 2.1 
Amortized loss (gain)(2.1)0.1 
Amortized prior service credit(0.1)(0.2)
Net periodic benefit cost$0.3 $2.1 

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 March 31, 2023 and December 31, 2022, we have a noncurrent pension liability of $71.7 million and $73.5 million, respectively. As of March 31, 2023 and December 31, 2022, we have a noncurrent other postretirement benefits liability of $303.3 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.