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Retirement Plans | 9 Months Ended
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Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
Retirement Plans | RETIREMENT PLANS The following is a summary of net pension and Supplemental Executive Retirement Plan (“SERP”) expense recognized by the Company.
(In millions) | 13 Weeks Ended September 30, 2017 |  | 12 Weeks Ended September 10, 2016 |  | 39 Weeks Ended September 30, 2017 |  | 36 Weeks Ended September 10, 2016
Service cost pertaining to benefits earned during the period | $ | 1.8 |  |  | $ | 1.5 |  |  | $ | 5.4 |  |  | $ | 4.5 |
Interest cost on projected benefit obligations | 4.5 |  |  | 4.5 |  |  | 13.3 |  |  | 13.3 |
Expected return on pension assets | (5.0 | ) |  | (4.6 | ) |  | (14.8 | ) |  | (13.9 | )
Net amortization loss | 2.4 |  |  | 1.1 |  |  | 7.3 |  |  | 3.4 |
Net pension expense | $ | 3.7 |  |  | $ | 2.5 |  |  | $ | 11.2 |  |  | $ | 7.3 |

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