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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. 30, 2023
Oct. 01, 2022
Sep. 30, 2023
Oct. 01, 2022
Retirement Benefits [Abstract]        
Service cost pertaining to benefits earned during the period $ 0.7 $ 1.3 $ 2.3 $ 4.0
Interest cost on projected benefit obligations 4.4 3.3 13.3 9.9
Expected return on pension assets (4.6) (5.1) (13.9) (15.4)
Net amortization loss (0.1) 2.9 (0.5) 8.5
Net pension expense $ 0.4 $ 2.4 $ 1.2 $ 7.0