Segment Reporting (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) numberOfSegments	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Revenues	$ 947,127	$ 883,744
Revenue Transactions With Other Operating Segments	0	0
Net Sales	947,127	883,744
Segment Profit Information	246,215	236,734
Amortization of Deferred Charges	(19,612)	(17,193)
Interest Expense, Operating and Nonoperating	(17,007)	(16,653)
Restructuring Charges	(7,270)	(3,767)
Other Nonoperating Income (Expense)	7,329	2,821
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	209,655	201,942
Depreciation	13,160	12,464
Assets	3,668,915	3,234,679	$ 3,712,646
Payments to Acquire Property, Plant, and Equipment	(17,414)	(17,255)
Goodwill	$ 736,872	673,246	$ 739,225
Number of Reportable Segments | numberOfSegments	5
Operating Segments
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Revenues	$ 0	0
Revenue Transactions With Other Operating Segments	(368,347)	(340,928)
Net Sales	(368,347)	(340,928)
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Segment Reporting, Other Segment Item, Amount	(58,012)	52,110
Segment Profit Information	(58,012)	(52,110)
Depreciation	1,683	1,491
Assets	(8,386,064)	(7,708,217)
Payments to Acquire Property, Plant, and Equipment	(8,646)	(10,031)
Goodwill	0	0
Us Operations segment Member | Operating Segments
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Revenues	348,547	345,758
Revenue Transactions With Other Operating Segments	33,797	34,093
Net Sales	382,344	379,851
Cost of Product and Service Sold	159,137	162,922
Period Expense	135,383	132,633
Segment Profit Information	87,824	84,296
Swiss Operations segment Member | Operating Segments
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Revenues	50,759	47,302
Revenue Transactions With Other Operating Segments	191,957	176,506
Net Sales	242,716	223,808
Cost of Product and Service Sold	118,743	102,224
Period Expense	68,908	60,589
Segment Profit Information	55,065	60,995
Western European Operations Segment [Member] | Operating Segments
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Revenues	215,383	190,369
Revenue Transactions With Other Operating Segments	50,439	45,087
Net Sales	265,822	235,456
Cost of Product and Service Sold	117,947	104,067
Period Expense	98,957	88,344
Segment Profit Information	48,918	43,045
Depreciation	1,489	1,328
Assets	1,761,738	1,556,180
Payments to Acquire Property, Plant, and Equipment	(1,306)	(1,197)
Goodwill	105,487	100,893
Chinese Operations Segment [Member] | Operating Segments
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Revenues	153,523	141,168
Revenue Transactions With Other Operating Segments	81,179	77,076
Net Sales	234,702	218,244
Cost of Product and Service Sold	104,138	99,478
Period Expense	45,688	42,749
Segment Profit Information	84,876	76,017
Depreciation	2,339	2,328
Assets	1,071,854	891,977
Payments to Acquire Property, Plant, and Equipment	(1,559)	(1,717)
Goodwill	640	601
Other Operations [Member] | Operating Segments
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Revenues	178,915	159,147
Revenue Transactions With Other Operating Segments	10,975	8,166
Net Sales	189,890	167,313
Cost of Product and Service Sold	101,062	87,470
Period Expense	61,284	55,352
Segment Profit Information	27,544	24,491
Us Operations segment Member | Operating Segments
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Depreciation	4,300	4,171
Assets	4,403,924	4,142,103
Payments to Acquire Property, Plant, and Equipment	(2,323)	(2,298)
Goodwill	568,684	532,394
Swiss Operations segment Member | Operating Segments
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Depreciation	1,769	1,665
Assets	4,292,328	3,941,300
Payments to Acquire Property, Plant, and Equipment	(1,499)	(703)
Goodwill	29,262	26,245
Other Operations Segment | Operating Segments
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Depreciation	1,580	1,481
Assets	525,135	411,336
Payments to Acquire Property, Plant, and Equipment	(2,081)	(1,309)
Goodwill	$ 32,799	$ 13,113