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Retirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of net pension and retiree health benefit (income) cost | Net pension and retiree health benefit (income) cost included the following components:
| Defined Benefit Pension Plans
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Components of net periodic benefit cost: |  |  |  |  |  |  |
Service cost | $ | 92.0 |  |  | $ | 78.7 |  |  |  |  |
Interest cost | 84.3 |  |  | 105.0 |  |  |  |  |
Expected return on plan assets | (238.0) |  |  | (221.2) |  |  |  |  |
Amortization of prior service cost | 1.1 |  |  | 1.1 |  |  |  |  |
Recognized actuarial loss | 121.8 |  |  | 111.0 |  |  |  |  |
Net periodic benefit cost | $ | 61.2 |  |  | $ | 74.6 |  |  |  |  |
| Retiree Health Benefit Plans
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Components of net periodic benefit income: |  |  |  |  |  |  |
Service cost | $ | 11.7 |  |  | $ | 9.8 |  |  |  |  |
Interest cost | 8.1 |  |  | 11.0 |  |  |  |  |
Expected return on plan assets | (36.6) |  |  | (37.4) |  |  |  |  |
Amortization of prior service benefit | (14.9) |  |  | (14.9) |  |  |  |  |
Recognized actuarial loss | 0.8 |  |  | 0.8 |  |  |  |  |
Net periodic benefit income | $ | (30.9) |  |  | $ | (30.7) |  |  |  |  |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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