Retirement Benefit Plans - Weighted Average Asset Allocations (Details) - Pension Plan	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	36.00%	56.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	62.00%	38.00%
Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	2.00%	2.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	0.00%	4.00%