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Retirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Schedule of Net Pension and Retiree Health (Benefit) Cost | Net pension and retiree health (benefit) cost included the following components:
| Defined Benefit Pension Plans
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic cost: |  |  |  |  |  |  |
Service cost | $ | 85.6 |  |  | $ | 74.9 |  |  | $ | 169.4 |  |  | $ | 145.3 |
Interest cost | 165.7 |  |  | 162.6 |  |  | 330.7 |  |  | 323.7 |
Expected return on plan assets | (277.9) |  |  | (264.2) |  |  | (555.5) |  |  | (527.5) |
Amortization of prior service cost | 0.5 |  |  | 0.6 |  |  | 1.0 |  |  | 1.2 |
Recognized actuarial loss | 31.8 |  |  | 30.9 |  |  | 62.4 |  |  | 60.9 |
Net periodic cost | $ | 5.7 |  |  | $ | 4.8 |  |  | $ | 8.0 |  |  | $ | 3.6 |
| Retiree Health Benefit Plans
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic benefit: |  |  |  |  |  |  |
Service cost | $ | 9.5 |  |  | $ | 8.2 |  |  | $ | 17.7 |  |  | $ | 15.9 |
Interest cost | 15.6 |  |  | 15.3 |  |  | 31.1 |  |  | 30.7 |
Expected return on plan assets | (48.0) |  |  | (45.6) |  |  | (96.1) |  |  | (91.1) |
Amortization of prior service benefit | (1.4) |  |  | (13.2) |  |  | (2.8) |  |  | (26.4) |
Recognized actuarial gain | (0.7) |  |  | (2.0) |  |  | (1.3) |  |  | (2.9) |
Net periodic benefit | $ | (25.0) |  |  | $ | (37.3) |  |  | $ | (51.4) |  |  | $ | (73.8) |

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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 -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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