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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. 28, 2024 | Sep. 30, 2023 | Sep. 28, 2024 | Sep. 30, 2023
Retirement Benefits [Abstract] |  |  |  |
Service cost pertaining to benefits earned during the period | $ 0.7 | $ 0.7 | $ 2.1 | $ 2.3
Interest cost on projected benefit obligations | 4.5 | 4.4 | 13.4 | 13.3
Expected return on pension assets | (4.9) | (4.6) | (14.7) | (13.9)
Net amortization loss | (0.5) | (0.1) | (1.3) | (0.5)
Net pension expense (income) | $ (0.2) | $ 0.4 | $ (0.5) | $ 1.2

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