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Retirement Benefit Plans (Assumptions Used in Accounting for Defined Benefit Plans) (Details) - Pension Plan
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Expected long-term rate of return on assets for net periodic benefit cost 7.00% 7.00%
Minimum    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average discount rates for pension benefit obligation 2.53% 2.02%
Weighted average discount rates for net periodic benefit cost 2.02% 2.98%
Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average discount rates for pension benefit obligation 2.77% 2.36%
Weighted average discount rates for net periodic benefit cost 2.36% 3.20%