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Pension and Other Post-Retirement Benefits | 9 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |
Pension and Other Post-Retirement Benefits | Pension and Other Post-Retirement Benefits The following table shows the components of our pension and other post-retirement net periodic cost for the three months ended September 30, 2020 and 2019 (in millions):
| 2020 Pension Benefits |  | 2019 Pension Benefits |  | 2020 Retiree Health and Life |  | 2019 Retiree Health and Life
Service cost | $ | 2.0 |  |  | $ | 1.7 |  |  | $ | — |  |  | $ | — |
Interest cost | 3.1 |  |  | 3.8 |  |  | 0.1 |  |  | 0.2 |
Expected return on plan assets | (5.0) |  |  | (5.6) |  |  | — |  |  | — |
Amortization of (1): |  |  |  |  |  |  |
Unrecognized prior service credit | — |  |  | — |  |  | — |  |  | — |
Unrecognized net actuarial loss (gain) | 3.1 |  |  | 2.0 |  |  | (0.1) |  |  | — |
Net periodic cost | $ | 3.2 |  |  | $ | 1.9 |  |  | $ | — |  |  | $ | 0.2 |
The following table shows the components of our pension and other post-retirement benefits expense for the nine months ended September 30, 2020 and 2019 (in millions):
| 2020 Pension Benefits |  | 2019 Pension Benefits |  | 2020 Retiree Health and Life |  | 2019 Retiree Health and Life
Service cost | $ | 6.0 |  |  | $ | 4.9 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost | 9.2 |  |  | 11.4 |  |  | 0.4 |  |  | 0.7 |
Expected return on plan assets | (15.1) |  |  | (16.6) |  |  | — |  |  | — |
Amortization of (1): |  |  |  |  |  |  |
Unrecognized prior service credit | — |  |  | — |  |  | (0.1) |  |  | (0.1) |
Unrecognized net actuarial loss (gain) | 9.5 |  |  | 6.0 |  |  | (0.3) |  |  | (0.1) |
Net periodic cost | $ | 9.6 |  |  | $ | 5.7 |  |  | $ | 0.1 |  |  | $ | 0.6 |
_______ (1) Amounts reclassified from accumulated other comprehensive loss. The service cost component of net periodic cost is recorded in selling, general and administrative expense in the statements of comprehensive income, and the non-service components are recorded in other expense.

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