Retirement Benefit Plans - Weighted-average Asset Allocations by Asset Category (Details) - Non-U.S. Plan - Pension Plan - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan assets, amount	$ 13.4	$ 12.6	$ 12.7
Level 1
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan assets, amount	7.2	0.0
Level 2
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan assets, amount	0.0	0.0
Level 3
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan assets, amount	6.2	12.6
Investment Account Held by Pension Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan assets, amount	7.2	6.7
Investment Account Held by Pension Plan | Level 1
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan assets, amount	7.2	0.0
Investment Account Held by Pension Plan | Level 2
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan assets, amount	0.0	0.0
Investment Account Held by Pension Plan | Level 3
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan assets, amount	0.0	6.7
Buy-in Insurance Contract
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan assets, amount	6.2	5.9
Buy-in Insurance Contract | Level 1
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan assets, amount	0.0	0.0
Buy-in Insurance Contract | Level 2
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan assets, amount	0.0	0.0
Buy-in Insurance Contract | Level 3
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan assets, amount	$ 6.2	$ 5.9