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EMPLOYEE BENEFIT PLANS | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS Net periodic benefit expense (income) for our pension and postretirement plans include the following components: Domestic Pension Plans
| Three months ended
| March 31, 2018 |  | April 1, 2017
Service cost | $ | — |  |  | $ | 0.1 |
Interest cost | 3.1 |  |  | 3.3 |
Expected return on plan assets | (2.6 | ) |  | (2.5 | )
Net periodic pension benefit expense | $ | 0.5 |  |  | $ | 0.9 |
Foreign Pension Plans
| Three months ended
| March 31, 2018 |  | April 1, 2017
Service cost | $ | — |  |  | $ | — |
Interest cost | 1.2 |  |  | 1.2 |
Expected return on plan assets | (1.9 | ) |  | (1.5 | )
Net periodic pension benefit income | $ | (0.7 | ) |  | $ | (0.3 | )
Postretirement Plans
| Three months ended
| March 31, 2018 |  | April 1, 2017
Service cost | $ | — |  |  | $ | — |
Interest cost | 0.5 |  |  | 1.0 |
Amortization of unrecognized prior service credits | (1.0 | ) |  | (0.2 | )
Net periodic postretirement benefit income | $ | (0.5 | ) |  | $ | 0.8 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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