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Retirement Plans (Summary of Net Pension and Supplemental Executive Retirement Plan Expense Recognized) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Retirement Benefits [Abstract] |  |  |  |
Service cost pertaining to benefits earned during the period | $ 1.5 | $ 1.8 | $ 4.6 | $ 5.4
Interest cost on projected benefit obligations | 4.1 | 4.5 | 12.4 | 13.3
Expected return on pension assets | (5.4) | (5.0) | (15.5) | (14.8)
Net amortization loss | 0.8 | 2.4 | 2.5 | 7.3
Net pension expense | $ 1.0 | $ 3.7 | $ 4.0 | $ 11.2

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