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Segment Reporting Segment (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) reportableSegment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Segment Reporting [Abstract] |  |  |
Number of reportable segments | reportableSegment | 5 |  |
Net sales to external customers | $ 3,872,361 | $ 3,788,309 | $ 3,919,709
Net sales to other segments | 0 | 0 | 0
Net Sales | 3,872,361 | 3,788,309 | 3,919,709
Segment profit | 1,199,923 | 1,151,896 | 1,192,459
Depreciation | 50,352 | 48,951 | 46,784
Assets | 3,239,999 | 3,355,555 | 3,492,395
Purchase of property, plant and equipment | (103,898) | (105,323) | (121,241)
Goodwill | 668,914 | 670,108 | 660,170
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |
Net sales to external customers | 0 | 0 | 0
Net sales to other segments | (1,482,763) | (1,385,896) | (1,505,858)
Net Sales | (1,482,763) | (1,385,896) | (1,505,858)
Unallocated expense / eliminations | 150,073 | 146,642 | 164,023
Segment profit | (150,073) | (146,642) | (164,023)
Depreciation | 6,170 | 6,814 | 6,713
Assets | (7,397,549) | (6,978,811) | (5,988,260)
Purchase of property, plant and equipment | (45,474) | (33,459) | (34,291)
Goodwill | 0 | 0 | 0
U.S. Operations Segment | Operating Segments [Member] |  |  |
Depreciation | 16,970 | 15,863 | 14,582
Assets | 4,081,688 | 3,848,003 | 3,574,842
Purchase of property, plant and equipment | (16,542) | (36,269) | (55,464)
Goodwill | 532,394 | 526,392 | 524,470
Swiss Operations Segment | Operating Segments [Member] |  |  |
Net sales to external customers | 218,580 | 188,679 | 176,119
Net sales to other segments | 801,749 | 761,114 | 839,951
Net Sales | 1,020,329 | 949,793 | 1,016,070
Segment cost of sales | 498,505 | 436,494 | 487,642
Segment period expense | 241,178 | 231,818 | 218,584
Segment profit | 280,646 | 281,481 | 309,844
Depreciation | 7,086 | 7,017 | 6,644
Assets | 3,780,506 | 3,554,911 | 2,968,539
Purchase of property, plant and equipment | (9,504) | (8,030) | (7,690)
Goodwill | 25,601 | 27,532 | 25,058
Western European Operations Segment | Operating Segments [Member] |  |  |
Net sales to external customers | 858,002 | 792,907 | 799,931
Net sales to other segments | 185,321 | 188,963 | 196,900
Net Sales | 1,043,323 | 981,870 | 996,831
Segment cost of sales | 486,823 | 455,596 | 488,153
Segment period expense | 350,199 | 347,601 | 334,326
Segment profit | 206,301 | 178,673 | 174,352
Depreciation | 5,339 | 5,351 | 4,970
Assets | 1,505,017 | 1,533,297 | 1,314,332
Purchase of property, plant and equipment | (6,340) | (5,052) | (5,110)
Goodwill | 97,426 | 101,653 | 96,077
Chinese Operations Segment | Operating Segments [Member] |  |  |
Net sales to external customers | 628,447 | 718,818 | 841,526
Net sales to other segments | 320,196 | 278,027 | 308,164
Net Sales | 948,643 | 996,845 | 1,149,690
Segment cost of sales | 422,130 | 448,341 | 530,270
Segment period expense | 180,713 | 181,410 | 195,258
Segment profit | 345,800 | 367,094 | 424,162
Depreciation | 9,434 | 9,609 | 9,699
Assets | 854,023 | 989,955 | 1,234,303
Purchase of property, plant and equipment | (14,355) | (10,133) | (12,418)
Goodwill | 597 | 621 | 641
Other Operations Segment | Operating Segments [Member] |  |  |
Net sales to external customers | 737,830 | 683,986 | 657,673
Net sales to other segments | 21,738 | 20,600 | 3,959
Net Sales | 759,568 | 704,586 | 661,632
Segment cost of sales | 421,489 | 400,634 | 380,360
Segment period expense | 213,895 | 197,714 | 190,950
Segment profit | 124,184 | 106,238 | 90,322
Depreciation | 5,353 | 4,297 | 4,176
Assets | 416,314 | 408,200 | 388,639
Purchase of property, plant and equipment | (11,683) | (12,380) | (6,268)
Goodwill | 12,896 | 13,910 | 13,924
Us Operations segment Member | Operating Segments [Member] |  |  |
Net sales to external customers | 1,429,502 | 1,403,919 | 1,444,460
Net sales to other segments | 153,759 | 137,192 | 156,884
Net Sales | 1,583,261 | 1,541,111 | 1,601,344
Segment cost of sales | 690,498 | 689,004 | 736,798
Segment period expense | 499,698 | 487,055 | 506,744
Segment profit | $ 393,065 | $ 365,052 | $ 357,802

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