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Pension and Other Postemployment Benefits | 6 Months Ended
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Jun. 30, 2022
Pension and Other Postemployment Benefits [Abstract] |
Pension and Other Postemployment Benefits | Pension and Other Postemployment Benefits Defined Benefit Pension Plans The components of net periodic benefit expense were (in millions):
| Six Months Ended June 30,
| 2022 |  | 2021
Service cost | $ | 0.8 |  |  | $ | 2.7 |
Interest cost | 1.7 |  |  | 1.5 |
Expected return on plan assets | (0.3) |  |  | (0.5) |
Amortization of prior service cost | 0.2 |  |  | 0.4 |
Amortization of actuarial losses | 1.7 |  |  | 4.6 |
| $ | 4.1 |  |  | $ | 8.7 |
We contributed $0.3 million to our defined benefit pension plans in each of the six months ended June 30, 2022 and 2021. Postemployment Arrangements The components of net periodic benefit expense were (in millions):
| Six Months Ended June 30,
| 2022 |  | 2021
Service cost | $ | 2.2 |  |  | $ | 2.4 |
Interest cost | 1.3 |  |  | 1.1 |
Amortization of prior service cost | 1.9 |  |  | 2.1 |
Amortization of actuarial losses | 1.3 |  |  | 1.9 |
| $ | 6.7 |  |  | $ | 7.5 |

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