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Retirement and Postretirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Components of Net Periodic Cost for Pension and Postretirement Benefits | Components of the net periodic cost for retirement and postretirement benefits for the three months ended March 31, 2021 and 2020 were as follows:
| U.S. Defined Benefit Plans |  | Non-U.S. Defined Benefit Plans |  | Postretirement Medical Benefits
(Amounts in millions) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 6.8 |  |  | $ | 6.3 |  |  | $ | 1.8 |  |  | $ | 1.7 |  |  | $ | — |  |  | $ | — |
Interest cost | 3.1 |  |  | 3.8 |  |  | 1.4 |  |  | 1.6 |  |  | 0.1 |  |  | 0.1 |
Expected return on plan assets | (6.5) |  |  | (6.7) |  |  | (1.5) |  |  | (1.2) |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | 0.1 |  |  | 0.1 |  |  | — |  |  | — |
Amortization of unrecognized net loss (gain) | 1.9 |  |  | 1.7 |  |  | 1.1 |  |  | 1.0 |  |  | — |  |  | — |
Net periodic cost recognized | $ | 5.3 |  |  | $ | 5.1 |  |  | $ | 2.9 |  |  | $ | 3.2 |  |  | $ | 0.1 |  |  | $ | 0.1 |

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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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