Retirement Benefit Plans - Changes in Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Postretirement Medical Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	$ 4.8	$ 4.3	$ 4.6
Service cost	0.0	0.0	0.0
Interest cost	0.2	0.2	0.3
Actuarial loss (gain)	1.1	0.1
Foreign exchange	0.0	0.0
Net transfer in	0.0	0.0
Benefits paid	(0.8)	(0.6)
Benefit obligation at end of year	4.8	4.3	4.6
Change in fair value of plan assets and net accrued liabilities:
Fair value at beginning of year	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	0.8	0.6
Foreign exchange	0.0	0.0
Net transfer in	0.0	0.0
Benefits paid	(0.8)	(0.6)
Fair value at end of year	0.0	0.0	0.0
Funded status at end of year	(4.8)	(4.3)
Noncurrent other assets	0.0	0.0
Current liabilities	(0.6)	(0.5)
Long-term liabilities	(4.2)	(3.8)
Net accrued liability	(4.8)	(4.3)
Prior service cost	0.0	0.0
Net actuarial (loss) gain	0.0	1.4
Accumulated other comprehensive (loss) income	0.0	1.4
UNITED STATES | Supplemental Employee Retirement Plan
Change in benefit obligation:
Benefit obligation at beginning of year	0.8	0.8	0.9
Service cost	0.0	0.0	0.0
Interest cost	0.0	0.0	0.0
Actuarial loss (gain)	0.1	0.0
Foreign exchange	0.0	0.0
Net transfer in	0.0	0.0
Benefits paid	(0.1)	(0.1)
Benefit obligation at end of year	0.8	0.8	0.9
Change in fair value of plan assets and net accrued liabilities:
Fair value at beginning of year	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	0.1	0.1
Foreign exchange	0.0	0.0
Net transfer in	0.0	0.0
Benefits paid	(0.1)	(0.1)
Fair value at end of year	0.0	0.0	0.0
Funded status at end of year	(0.8)	(0.8)
Noncurrent other assets	0.0	0.0
Current liabilities	(0.1)	(0.1)
Long-term liabilities	(0.7)	(0.7)
Net accrued liability	(0.8)	(0.8)
Prior service cost	0.0	0.0
Net actuarial (loss) gain	(0.7)	(0.7)
Accumulated other comprehensive (loss) income	(0.7)	(0.7)
Non-U.S. Plan | Pension Plan
Change in benefit obligation:
Benefit obligation at beginning of year	11.3	10.3	10.4
Service cost	0.1	0.1	0.1
Interest cost	0.5	0.4	0.5
Actuarial loss (gain)	0.3	(0.2)
Foreign exchange	1.0	(0.4)
Net transfer in	0.0	0.7
Benefits paid	(0.9)	(0.7)
Benefit obligation at end of year	11.3	10.3	10.4
Change in fair value of plan assets and net accrued liabilities:
Fair value at beginning of year	12.6	12.7
Actual return on plan assets	0.3	(0.2)
Employer contributions	0.5	0.3
Foreign exchange	0.9	(0.2)
Net transfer in	0.0	0.7
Benefits paid	(0.9)	(0.7)
Fair value at end of year	13.4	12.6	$ 12.7
Funded status at end of year	2.1	2.3
Noncurrent other assets	6.2	6.4
Current liabilities	(0.3)	(0.3)
Long-term liabilities	(3.8)	(3.8)
Net accrued liability	2.1	2.3
Prior service cost	(0.1)	(0.1)
Net actuarial (loss) gain	1.9	2.7
Accumulated other comprehensive (loss) income	$ 1.8	$ 2.6