Retirement Benefit Plans (Percentage and Target Allocations) (Details)	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	100.00%	100.00%
Cash And Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	1.00%	1.00%
Cash And Equivalents [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%	0.00%
Cash And Equivalents [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	5.00%	5.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	72.00%	68.00%
Fixed Income Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	62.00%	62.00%
Fixed Income Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	84.00%	84.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	19.00%	22.00%
Equity Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	16.00%	16.00%
Equity Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	22.00%	22.00%
Real Assets Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	8.00%	9.00%
Real Assets Fund [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	4.00%	4.00%
Real Assets Fund [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	10.00%	10.00%