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Pension and Other Post-Retirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |
Components of pension and other post retirement benefit costs | 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.

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- Definition Tabular disclosure of pension and other postretirement benefit arrangements with individual employees, which are generally based on employment contracts between the entity and one or more selected officers or key employees, and which contain a promise by the employer to pay certain amounts at designated future dates, usually including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period and the carrying amount as of the balance sheet date of the related liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361 + Details
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