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v3.25.3

Employee Benefit Plans (Notes) | 9 Months Ended
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Sep. 30, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | 9. 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,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (in millions)
Service cost |  | $ | 0.1 |  |  | $ | 0.3 |  |  | $ | 0.2 |  |  | $ | 0.8 |
Interest cost |  | 5.9 |  |  | 5.8 |  |  | 17.9 |  |  | 17.4 |
Expected asset return |  | (6.4) |  |  | (7.2) |  |  | (19.2) |  |  | (21.5) |
Amortized loss |  | 2.2 |  |  | 1.7 |  |  | 6.5 |  |  | 5.1 |
Net periodic benefit cost |  | $ | 1.8 |  |  | $ | 0.6 |  |  | $ | 5.4 |  |  | $ | 1.8 |
|  | Other Postretirement Benefits
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (in millions)
Service cost |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  | 2.3 |  |  | 2.1 |  |  | 6.8 |  |  | 6.3 |
Amortized gain |  | (2.4) |  |  | (2.5) |  |  | (7.1) |  |  | (7.5) |
Amortized prior service credit |  | (0.2) |  |  | (0.1) |  |  | (0.5) |  |  | (0.3) |
Net periodic benefit credit |  | $ | (0.2) |  |  | $ | (0.5) |  |  | $ | (0.7) |  |  | $ | (1.4) |
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, 2025 and December 31, 2024, we have a noncurrent pension liability of $77.6 million and $78.3 million, respectively. As of September 30, 2025 and December 31, 2024, we have a noncurrent other postretirement benefits liability of $264.0 million and $265.3 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 2025 to be approximately $1.1 million. We expect our cash payments for other postretirement benefit obligations in 2025, net of GM cost sharing, to be approximately $11.6 million.

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