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Pension and Other Postretirement Benefits | 9 Months Ended
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Sep. 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 September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Interest cost | $ | 7.9 |  |  | $ | 5.7 |  |  | $ | 23.4 |  |  | $ | 16.8 |
Expected return on plan assets | (7.9) |  |  | (9.7) |  |  | (23.4) |  |  | (28.8) |
Amortization of net gain | (0.1) |  |  | — |  |  | (0.3) |  |  | (0.1) |
Net periodic pension and retiree medical income (1) | $ | (0.1) |  |  | $ | (4.0) |  |  | $ | (0.3) |  |  | $ | (12.1) |
(1)Included in Other, net, in our Condensed Consolidated Statements of Operations.

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