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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 883,744 $ 925,949  
Revenue Transactions With Other Operating Segments 0 0  
Net Sales 883,744 925,949  
Segment Profit Information 236,734 267,328  
Amortization of Deferred Charges (17,193) (18,228)  
Interest Expense, Operating and Nonoperating (16,653) (19,232)  
Restructuring Charges (3,767) (9,664)  
Other Nonoperating Income (Expense) 2,821 343  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 201,942 220,547  
Depreciation 12,464 12,522  
Assets 3,234,679 3,283,117 $ 3,239,999
Payments to Acquire Property, Plant, and Equipment (17,255) (17,449)  
Goodwill 673,246 665,816 $ 668,914
Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 0 0  
Revenue Transactions With Other Operating Segments (340,928) (392,499)  
Net Sales (340,928) (392,499)  
Segment Reporting, Reconciling Item, Corporate Nonsegment      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Segment Reporting, Other Segment Item, Amount 52,110 36,710  
Segment Profit Information (52,110) (36,710)  
Depreciation 1,491 1,522  
Assets (7,708,217) (6,996,799)  
Payments to Acquire Property, Plant, and Equipment (10,031) (8,168)  
Goodwill 0 0  
Us Operations segment Member | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 345,758 346,123  
Revenue Transactions With Other Operating Segments 34,093 37,418  
Net Sales 379,851 383,541  
Cost of Product and Service Sold 162,922 166,324  
Period Expense 132,633 123,581  
Segment Profit Information 84,296 93,636  
Swiss Operations segment Member | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 47,302 54,251  
Revenue Transactions With Other Operating Segments 176,506 223,371  
Net Sales 223,808 277,622  
Cost of Product and Service Sold 102,224 158,995  
Period Expense 60,589 59,541  
Segment Profit Information 60,995 59,086  
Western European Operations Segment [Member] | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 190,369 214,765  
Revenue Transactions With Other Operating Segments 45,087 47,738  
Net Sales 235,456 262,503  
Cost of Product and Service Sold 104,067 123,977  
Period Expense 88,344 88,215  
Segment Profit Information 43,045 50,311  
Depreciation 1,328 1,328  
Assets 1,556,180 1,556,200  
Payments to Acquire Property, Plant, and Equipment (1,197) (992)  
Goodwill 100,893 99,985  
Chinese Operations Segment [Member] | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 141,168 143,198  
Revenue Transactions With Other Operating Segments 77,076 80,641  
Net Sales 218,244 223,839  
Cost of Product and Service Sold 99,478 105,202  
Period Expense 42,749 42,814  
Segment Profit Information 76,017 75,823  
Depreciation 2,328 2,382  
Assets 891,977 996,197  
Payments to Acquire Property, Plant, and Equipment (1,717) (1,097)  
Goodwill 601 605  
Other Operations [Member] | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 159,147 167,612  
Revenue Transactions With Other Operating Segments 8,166 3,331  
Net Sales 167,313 170,943  
Cost of Product and Service Sold 87,470 94,811  
Period Expense 55,352 50,950  
Segment Profit Information 24,491 25,182  
Us Operations segment Member | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Depreciation 4,171 4,161  
Assets 4,142,103 3,899,642  
Payments to Acquire Property, Plant, and Equipment (2,298) (4,425)  
Goodwill 532,394 526,385  
Swiss Operations segment Member | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Depreciation 1,665 1,769  
Assets 3,941,300 3,423,650  
Payments to Acquire Property, Plant, and Equipment (703) (1,082)  
Goodwill 26,245 25,602  
Other Operations Segment | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Depreciation 1,481 1,360  
Assets 411,336 404,227  
Payments to Acquire Property, Plant, and Equipment (1,309) (1,685)  
Goodwill $ 13,113 $ 13,239