Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Postretirement Medical Benefits
Defined Benefit Plan, Plan Assets, Category [Line Items]
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	0.2	0.3	0.2
Expected return on plan assets	0.0	0.0	0.0
Amortization of net actuarial loss (gain)	(0.3)	(0.2)	0.0
Net periodic benefit cost (credit)	(0.1)	0.1	0.2
UNITED STATES | Supplemental Employee Retirement Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Service cost	0.0	0.0	0.0
Interest cost	0.0	0.0	0.0
Expected return on plan assets	0.0	0.0	0.0
Amortization of net actuarial loss (gain)	0.1	0.1	0.1
Net periodic benefit cost (credit)	0.1	0.1	0.1
Non-U.S. Plan | Pension Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Service cost	0.1	0.1	0.3
Interest cost	0.4	0.5	0.2
Expected return on plan assets	(0.8)	(0.7)	(0.4)
Amortization of net actuarial loss (gain)	(0.1)	(0.1)	0.0
Net periodic benefit cost (credit)	$ (0.4)	$ (0.2)	$ 0.1