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Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2017
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 and nine months ended September 30, 2017 and October 1, 2016:
| Pension Benefits |  | Other Postretirement Benefits
| Three Months Ended |  | Nine Months Ended |  | Three Months Ended |  | Nine Months Ended
(in millions) | Sep 30, 2017 |  | Oct 1, 2016 |  | Sep 30, 2017 |  | Oct 1, 2016 |  | Sep 30, 2017 |  | Oct 1, 2016 |  | Sep 30, 2017 |  | Oct 1, 2016
Interest cost | $ | 7.0 |  |  | $ | 8.9 |  |  | $ | 21.2 |  |  | $ | 26.8 |  |  | $ | 0.3 |  |  | $ | 0.4 |  |  | $ | 1.0 |  |  | $ | 1.1 |
Expected return on plan assets | (8.3 | ) |  | (9.6 | ) |  | (25.0 | ) |  | (28.8 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service credits | — |  |  | — |  |  | — |  |  | — |  |  | (0.1 | ) |  | (0.1 | ) |  | (0.5 | ) |  | (0.4 | )
Amortization of net actuarial losses | 3.6 |  |  | 4.3 |  |  | 10.8 |  |  | 13.0 |  |  | — |  |  | — |  |  | — |  |  | — |
Net pension and other benefit costs | $ | 2.3 |  |  | $ | 3.6 |  |  | $ | 7.0 |  |  | $ | 11.0 |  |  | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | 0.5 |  |  | $ | 0.7 |

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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://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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