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Employee Benefit Plans (Notes) | 6 Months Ended
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Jun. 30, 2020
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, |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | (in millions) |  |  |  |  |  |
Service cost |  | $ | 0.5 |  |  | $ | 0.4 |  |  | $ | 1.0 |  |  | $ | 0.7 |
Interest cost |  | 5.4 |  |  | 7.1 |  |  | 10.8 |  |  | 14.2 |
Expected asset return |  | (9.7) |  |  | (10.3) |  |  | (19.3) |  |  | (20.6) |
Amortized loss |  | 2.2 |  |  | 1.5 |  |  | 4.3 |  |  | 3.2 |
Net periodic benefit credit |  | $ | (1.6) |  |  | $ | (1.3) |  |  | $ | (3.2) |  |  | $ | (2.5) |
|  | Other Postretirement Benefits |  |  |  |  |  |
|  | Three Months Ended |  |  |  | Six Months Ended |  |
|  | June 30, |  |  |  | June 30, |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | (in millions) |  |  |  |  |  |
Service cost |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Interest cost |  | 2.5 |  |  | 3.2 |  |  | 5.1 |  |  | 6.4 |
Amortized loss |  | 0.3 |  |  | — |  |  | 0.5 |  |  | 0.1 |
Amortized prior service credit |  | (0.4) |  |  | (0.4) |  |  | (0.8) |  |  | (0.8) |
Net periodic benefit cost |  | $ | 2.5 |  |  | $ | 2.9 |  |  | $ | 5.0 |  |  | $ | 5.9 |
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, 2020 and December 31, 2019, we have a noncurrent pension liability of $109.9 million and $118.2 million, respectively. As of June 30, 2020 and December 31, 2019, we have a noncurrent other postretirement benefits liability of $517.6 million and $520.0 million, respectively. Due to the availability of our pre-funded pension balances (previous contributions in excess of prior required pension contributions) related to certain of our U.S. pension plans, we expect our regulatory pension funding requirements in 2020 to be approximately $1.5 million. We expect our cash payments for other postretirement benefit obligations in 2020, net of GM cost sharing, to be approximately $17 million.

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