Retirement Benefit Plans - Weighted Average Asset Allocations (Details) - Pension Plan	Dec. 31, 2023	Dec. 31, 2022
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	10.00%	36.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocations as a percentage of plan assets	88.00%	62.00%
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%	0.00%