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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues $ 1,029,699 $ 954,535 $ 2,896,664 $ 2,827,234  
Revenue Transactions With Other Operating Segments 0 0 0 0  
Net Sales 1,029,699 954,535 2,896,664 2,827,234  
Segment Profit 309,922 296,573 829,949 848,002  
Amortization of Deferred Charges (20,022) (18,243) (54,796) (54,649)  
Interest Expense, Operating and Nonoperating (17,695) (18,599) (51,127) (56,781)  
Restructuring Charges (5,972) (2,631) (13,296) (17,624)  
Other Nonoperating Income (Expense) 3,003 1,852 9,105 3,728  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 269,236 258,952 719,835 722,676  
Depreciation 12,715 12,836 38,049 37,709  
Assets 3,521,466 3,319,828 3,521,466 3,319,828 $ 3,239,999
Segment, Expenditure, Addition to Long-Lived Assets (48,365) (45,173) (65,620) (62,622)  
Goodwill 731,206 672,404 731,206 672,404 $ 668,914
Operating Segments          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 0 0 0 0  
Revenue Transactions With Other Operating Segments (404,903) (353,827) (1,127,710) (1,083,206)  
Net Sales (404,903) (353,827) (1,127,710) (1,083,206)  
Segment Reporting, Reconciling Item, Corporate Nonsegment          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Segment Reporting, Other Segment Item, Amount 60,202 45,749 164,621 123,657  
Segment Profit (60,202) (45,749) (164,621) (123,657)  
Depreciation 1,644 1,588 4,735 4,589  
Assets (7,956,927) (7,749,809) (7,956,927) (7,749,809)  
Segment, Expenditure, Addition to Long-Lived Assets (25,504) (24,376) (35,535) (32,544)  
Goodwill 0 0 0 0  
Us Operations segment Member | Operating Segments          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 385,850 351,042 1,104,124 1,059,380  
Revenue Transactions With Other Operating Segments 35,784 37,411 109,050 110,846  
Net Sales 421,634 388,453 1,213,174 1,170,226  
Cost of Product and Service Sold 186,632 167,199 536,803 505,417  
Period Expense 135,097 123,977 399,470 373,649  
Segment Profit 99,905 97,277 276,901 291,160  
Swiss Operations segment Member | Operating Segments          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 52,072 53,435 148,929 157,870  
Revenue Transactions With Other Operating Segments 218,605 188,956 594,434 581,521  
Net Sales 270,677 242,391 743,363 739,391  
Cost of Product and Service Sold 126,308 106,381 345,338 369,557  
Period Expense 62,336 55,815 184,416 174,749  
Segment Profit 82,033 80,195 213,609 195,085  
Western European Operations Segment | Operating Segments          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 227,176 201,837 629,461 618,915  
Revenue Transactions With Other Operating Segments 52,029 43,605 147,663 133,513  
Net Sales 279,205 245,442 777,124 752,428  
Cost of Product and Service Sold 126,898 113,969 345,947 349,169  
Period Expense 95,061 87,513 279,006 263,864  
Segment Profit 57,246 43,960 152,171 139,395  
Depreciation 1,509 1,310 4,309 3,977  
Assets 1,672,058 1,570,262 1,672,058 1,570,262  
Segment, Expenditure, Addition to Long-Lived Assets (3,384) (3,839) (4,581) (4,831)  
Goodwill 107,218 104,334 107,218 104,334  
Chinese Operations Segment | Operating Segments          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 166,964 164,400 470,149 471,982  
Revenue Transactions With Other Operating Segments 87,272 78,069 247,664 240,604  
Net Sales 254,236 242,469 717,813 712,586  
Cost of Product and Service Sold 112,946 107,650 323,415 315,640  
Period Expense 47,034 45,384 134,787 132,191  
Segment Profit 94,256 89,435 259,611 264,755  
Depreciation 2,360 2,353 7,019 7,093  
Assets 949,603 1,184,116 949,603 1,184,116  
Segment, Expenditure, Addition to Long-Lived Assets (6,806) (4,570) (8,523) (5,667)  
Goodwill 615 629 615 629  
Other Operations [Member] | Operating Segments          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 197,637 183,821 544,001 519,087  
Revenue Transactions With Other Operating Segments 11,213 5,786 28,899 16,722  
Net Sales 208,850 189,607 572,900 535,809  
Cost of Product and Service Sold 113,874 105,255 308,978 295,760  
Period Expense 58,292 52,897 171,644 158,785  
Segment Profit 36,684 31,455 92,278 81,264  
Us Operations segment Member | Operating Segments          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Depreciation 4,160 4,442 12,481 12,768  
Assets 4,291,423 4,020,585 4,291,423 4,020,585  
Segment, Expenditure, Addition to Long-Lived Assets (6,219) (5,714) (8,517) (10,139)  
Goodwill 567,223 526,337 567,223 526,337  
Swiss Operations segment Member | Operating Segments          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Depreciation 1,764 1,826 5,110 5,307  
Assets 4,075,489 3,869,423 4,075,489 3,869,423  
Segment, Expenditure, Addition to Long-Lived Assets (3,355) (3,983) (4,058) (5,065)  
Goodwill 29,029 27,316 29,029 27,316  
Other Operations Segment | Operating Segments          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Depreciation 1,278 1,317 4,395 3,975  
Assets 489,820 425,251 489,820 425,251  
Segment, Expenditure, Addition to Long-Lived Assets (3,097) (2,691) (4,406) (4,376)  
Goodwill $ 27,121 $ 13,788 $ 27,121 $ 13,788