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Retirement Plans | 6 Months Ended
--- | ---
Jun. 30, 2022
Retirement Benefits [Abstract] |
Retirement Plans | (11) Retirement Plans The components of the net periodic benefit cost (credit) for our plans were as follows:
|  | Defined Benefit Pension Plan |
|  | 3 Months Ended |  |  | 6 Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Service cost |  | $ | 4.9 |  |  | $ | 5.5 |  |  | $ | 10.0 |  |  | $ | 11.1 |
Interest cost |  |  | 2.2 |  |  |  | 1.6 |  |  |  | 4.5 |  |  |  | 3.1 |
Expected return on assets |  |  | (3.6 | ) |  |  | (3.0 | ) |  |  | (7.5 | ) |  |  | (6.1 | )
Net loss |  |  | 0.4 |  |  |  | 1.1 |  |  |  | 0.9 |  |  |  | 2.3 |
Prior service cost |  |  | 0.1 |  |  |  | 0.2 |  |  |  | 0.3 |  |  |  | 0.4 |
Total benefit cost |  | $ | 4.0 |  |  | $ | 5.4 |  |  | $ | 8.2 |  |  | $ | 10.8 |
|  | Retiree Health Care Plan |
|  | 3 Months Ended |  |  | 6 Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Interest cost |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 0.1 |
Prior service credit |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.4 | ) |  |  | (0.4 | )
Net Loss |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.1 |
Total benefit credit |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | (0.2 | ) |  | $ | (0.2 | )
During the three and six months ended June 30, 2022, contributions made to our pension plans were $2.4 and $4.5, respectively, and contributions made to our retiree health care plan were $0.3 and $0.6, respectively. During 2022, we expect to make total contributions of approximately $16.0 to our pension plans and to fund our retiree health care payments as incurred.

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