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Pension and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2023
Retirement Benefits [Abstract] |
Retirement Benefits [Text Block] | Pension and Other Post-retirement Benefits We have defined-benefit pension plans and retiree medical plans that provide post-retirement health and life insurance benefits. The components of net periodic pension and retiree medical income were as follows (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Interest cost | $ | 7.8 |  |  | $ | 5.6 |  |  | $ | 15.5 |  |  | $ | 11.1 |
Expected return on plan assets | (7.8) |  |  | (9.6) |  |  | (15.5) |  |  | (19.1) |
Amortization of net gain | (0.1) |  |  | (0.1) |  |  | (0.2) |  |  | (0.1) |
Net periodic pension and retiree medical income (1) | $ | (0.1) |  |  | $ | (4.1) |  |  | $ | (0.2) |  |  | $ | (8.1) |
(1)Included in Other, net, in our Condensed Consolidated Statements of Operations.

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