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Employee Benefit Plans (Notes) | 6 Months Ended
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Jun. 30, 2024
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 |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
|  | (in millions)
Service cost |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.5 |  |  | $ | 0.5 |
Interest cost |  | 5.8 |  |  | 6.1 |  |  | 11.6 |  |  | 12.1 |
Expected asset return |  | (7.1) |  |  | (7.3) |  |  | (14.3) |  |  | (14.5) |
Amortized loss |  | 1.7 |  |  | 1.1 |  |  | 3.4 |  |  | 2.1 |
Net periodic benefit cost |  | $ | 0.6 |  |  | $ | 0.1 |  |  | $ | 1.2 |  |  | $ | 0.2 |
|  | Other Postretirement Benefits
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
|  | (in millions)
Service cost |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  | 2.1 |  |  | 2.5 |  |  | 4.2 |  |  | 5.0 |
Amortized gain |  | (2.5) |  |  | (2.1) |  |  | (5.0) |  |  | (4.2) |
Amortized prior service credit |  | (0.1) |  |  | (0.1) |  |  | (0.2) |  |  | (0.2) |
Net periodic benefit cost (credit) |  | $ | (0.4) |  |  | $ | 0.4 |  |  | $ | (0.9) |  |  | $ | 0.7 |
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, 2024 and December 31, 2023, we have a noncurrent pension liability of $70.5 million and $74.7 million, respectively. As of June 30, 2024 and December 31, 2023, we have a noncurrent other postretirement benefits liability of $267.1 million and $268.9 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 2024 to be less than $1.0 million. We expect our cash payments for other postretirement benefit obligations in 2024, net of GM cost sharing, to be approximately $11.0 million.

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