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Retirement Benefits Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2011
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]        
Company's pretax income and the aggregate compensation levels of participating employees   $ 7.9 $ 6.9 $ 6.6
Postretirement benefit plans        
Defined Benefit Plan Disclosure [Line Items]        
Years of service, less than 10 years      
Health care cost trend assumption increased health care cost trend rates (as a percent)   7.00% 6.00%  
Health care cost trend assumption increased health care cost trend rates (as a percent)   5.00% 5.00%