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Retirement Plans (Summary of Net Pension and Supplemental Executive Retirement Plan Expense Recognized) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2023 | Jul. 02, 2022 | Jul. 01, 2023 | Jul. 02, 2022
Retirement Benefits [Abstract] |  |  |  |
Service cost pertaining to benefits earned during the period | $ 0.8 | $ 1.4 | $ 1.6 | $ 2.7
Interest cost on projected benefit obligations | 4.5 | 3.3 | 8.9 | 6.6
Expected return on pension assets | (4.7) | (5.2) | (9.3) | (10.3)
Net amortization loss | (0.2) | 2.8 | (0.4) | 5.6
Net pension expense | $ 0.4 | $ 2.3 | $ 0.8 | $ 4.6

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