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Pension and Other Post-Retirement Benefits | 3 Months Ended
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Mar. 31, 2019
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 benefits expense for the three months ended March 31, 2019 and 2018 (in millions):
| 2019 Pension Benefits |  | 2018 Pension Benefits |  | 2019 Retiree Health and Life |  | 2018 Retiree Health and Life
Service cost | $ | 1.7 |  |  | $ | 1.9 |  |  | $ | — |  |  | $ | 0.1 |
Interest cost | 3.8 |  |  | 3.7 |  |  | 0.2 |  |  | 0.2 |
Expected return on plan assets | (5.5 | ) |  | (5.6 | ) |  | — |  |  | — |
Amortization of (1): |  |  |  |  |  |  |
Unrecognized prior service credit | — |  |  | — |  |  | — |  |  | — |
Unrecognized net actuarial loss | 1.9 |  |  | 2.5 |  |  | — |  |  | — |
Net periodic cost | $ | 1.9 |  |  | $ | 2.5 |  |  | $ | 0.2 |  |  | $ | 0.3 |
________ (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 of net periodic cost are recorded in other expense.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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