Retirement Benefit Plans - Changes in Benefit Obligations and Plan Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in fair value of plan assets and net accrued liabilities:
Fair value at beginning of year	$ 0
Fair value at end of year		$ 0
Postretirement Medical Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	4,300,000	4,600,000	$ 5,400,000
Service cost	0	0	0
Interest cost	200,000	300,000	200,000
Actuarial loss (gain)	100,000	(700,000)
Foreign exchange	0	0
Net transfer in	0	0
Benefits paid	(600,000)	(400,000)
Benefit obligation at end of year	4,300,000	4,600,000	5,400,000
Change in fair value of plan assets and net accrued liabilities:
Fair value at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	600,000	400,000
Foreign exchange	0	0
Net transfer in	0	0
Benefits paid	(600,000)	(400,000)
Fair value at end of year	0	0	0
Funded status at end of year	(4,300,000)	(4,600,000)
Noncurrent other assets	0	0
Current liabilities	(500,000)	(600,000)
Long-term liabilities	(3,800,000)	(4,000,000.0)
Net accrued liability	(4,300,000)	(4,600,000)
Prior service cost	0	0
Net actuarial (loss) gain	1,400,000	1,800,000
Accumulated other comprehensive (loss) income	1,400,000	1,800,000
UNITED STATES | Supplemental Employee Retirement Plan
Change in benefit obligation:
Benefit obligation at beginning of year	800,000	900,000	900,000
Service cost	0	0	0
Interest cost	0	0	0
Actuarial loss (gain)	0	100,000
Foreign exchange	0	0
Net transfer in	0	0
Benefits paid	(100,000)	(100,000)
Benefit obligation at end of year	800,000	900,000	900,000
Change in fair value of plan assets and net accrued liabilities:
Fair value at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	100,000	100,000
Foreign exchange	0	0
Net transfer in	0	0
Benefits paid	(100,000)	(100,000)
Fair value at end of year	0	0	0
Funded status at end of year	(800,000)	(900,000)
Noncurrent other assets	0	0
Current liabilities	(100,000)	(100,000)
Long-term liabilities	(700,000)	(800,000)
Net accrued liability	(800,000)	(900,000)
Prior service cost	0	0
Net actuarial (loss) gain	(700,000)	(700,000)
Accumulated other comprehensive (loss) income	(700,000)	(700,000)
Non-U.S. Plan | Pension Plan
Change in benefit obligation:
Benefit obligation at beginning of year	10,300,000	10,400,000	10,300,000
Service cost	100,000	100,000	300,000
Interest cost	400,000	500,000	200,000
Actuarial loss (gain)	(200,000)	(300,000)
Foreign exchange	(400,000)	500,000
Net transfer in	700,000	0
Benefits paid	(700,000)	(700,000)
Benefit obligation at end of year	10,300,000	10,400,000	10,300,000
Change in fair value of plan assets and net accrued liabilities:
Fair value at beginning of year	12,700,000	11,300,000
Actual return on plan assets	(200,000)	1,100,000
Employer contributions	300,000	300,000
Foreign exchange	(200,000)	600,000
Net transfer in	700,000	0
Benefits paid	(700,000)	(600,000)
Fair value at end of year	12,600,000	12,700,000	$ 11,300,000
Funded status at end of year	2,300,000	2,300,000
Noncurrent other assets	6,400,000	6,500,000
Current liabilities	(300,000)	(300,000)
Long-term liabilities	(3,800,000)	(3,900,000)
Net accrued liability	2,300,000	2,300,000
Prior service cost	(100,000)	(100,000)
Net actuarial (loss) gain	2,700,000	3,600,000
Accumulated other comprehensive (loss) income	$ 2,600,000	$ 3,500,000