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v3.23.3

Employee Benefit Plans (Notes) | 9 Months Ended
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Sep. 30, 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 |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2023 |  | 2022 |  | 2023 |  | 2022
|  | (in millions)
Service cost |  | $ | 0.3 |  |  | $ | 0.5 |  |  | $ | 0.8 |  |  | $ | 1.4 |
Interest cost |  | 6.1 |  |  | 4.1 |  |  | 18.2 |  |  | 12.5 |
Expected asset return |  | (7.3) |  |  | (8.0) |  |  | (21.8) |  |  | (23.8) |
Amortized loss |  | 1.0 |  |  | 2.0 |  |  | 3.1 |  |  | 5.8 |
Net periodic benefit cost (credit) |  | $ | 0.1 |  |  | $ | (1.4) |  |  | $ | 0.3 |  |  | $ | (4.1) |
|  | Other Postretirement Benefits
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2023 |  | 2022 |  | 2023 |  | 2022
|  | (in millions)
Service cost |  | $ | — |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |
Interest cost |  | 2.6 |  |  | 2.1 |  |  | 7.6 |  |  | 6.3 |
Amortized loss (gain) |  | (2.1) |  |  | 0.2 |  |  | (6.3) |  |  | 0.4 |
Amortized prior service credit |  | (0.2) |  |  | (0.3) |  |  | (0.4) |  |  | (0.7) |
Net periodic benefit cost |  | $ | 0.3 |  |  | $ | 2.1 |  |  | $ | 1.0 |  |  | $ | 6.2 |
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, 2023 and December 31, 2022, we have a noncurrent pension liability of $67.3 million and $73.5 million, respectively. As of September 30, 2023 and December 31, 2022, we have a noncurrent other postretirement benefits liability of $301.1 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.

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