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Postretirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2018
Defined Benefit Plan [Abstract] |
Schedule of Net Pension and Other Benefit Costs | Pension and other postretirement benefit costs included the following components for the three months ended March 31, 2018 and April 1, 2017:
| Pension Benefits |  | Other Postretirement Benefits
(in millions) | March 31, 2018 |  | April 1, 2017 |  | March 31, 2018 |  | April 1, 2017
Interest cost | $ | 5.7 |  |  | $ | 7.1 |  |  | $ | 0.3 |  |  | $ | 0.3 |
Expected return on plan assets | (6.3 | ) |  | (8.4 | ) |  | — |  |  | — |
Amortization of prior service credits | — |  |  | — |  |  | (0.2 | ) |  | (0.2 | )
Amortization of net actuarial losses | 2.5 |  |  | 3.6 |  |  | — |  |  | — |
Net pension and other benefit costs | $ | 1.9 |  |  | $ | 2.3 |  |  | $ | 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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