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Defined Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Compensation And Retirement Disclosure [Abstract] |
Components of Net Periodic Benefit Income for Pension Benefits | The components of net periodic benefit income for pension benefits for the six and three months ended June 30, 2021 and 2020 were as follows:
(In millions) |  | Six Months Ended June 30, |  |  | Three Months Ended June 30, |  |
|  | Pension Benefits |  |  | Pension Benefits |  |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |  |
Service cost |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |
Interest cost |  |  | 12.0 |  |  |  | 14.2 |  |  |  | 6.0 |  |  |  | 7.1 |  |
Expected return on plan assets |  |  | (17.5 | ) |  |  | (16.4 | ) |  |  | (8.8 | ) |  |  | (8.2 | ) |
Net periodic benefit income |  | $ | (5.3 | ) |  | $ | (2.0 | ) |  | $ | (2.7 | ) |  | $ | (1.0 | ) |

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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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