Retirement Benefit Plans (Weighted Average Assumptions used to Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2030
Defined Benefit Plan Disclosure [Line Items]
Expected long-term return on assets (as a percent)	5.50%
Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed healthcare cost trend rate				4.40%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	2.29%	3.07%	4.12%
Expected long-term return on assets (as a percent)	5.50%	5.75%	6.00%
SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	1.91%	2.82%	3.95%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	1.40%	2.50%	3.69%
Assumed healthcare cost trend (as a percent)	6.50%	6.50%	6.50%
Assumed healthcare cost trend rate	6.25%	6.50%