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Shareholders' Equity - Narrative (Details)
SFr / shares in Units, $ / shares in Units, $ in Thousands, SFr in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
SFr / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
SFr / shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2024
CHF (SFr)
SFr / shares
shares
Mar. 31, 2024
SFr / shares
shares
Class of Stock [Line Items]                    
Nominal share capital issued (CHF) | SFr                 SFr 42.2  
Shares issued (in shares)     168,994,142   168,994,142 168,994,142     168,994,142 173,106,000
Shares, par value (in CHF per share) | SFr / shares                 SFr 0.25 SFr 0.25
Treasury, at cost, shares (in shares)     19,555,027   19,555,027 19,555,027     19,555,027 19,243,000
Adjusted share capital period (in years)           5 years        
Cancellation of treasury shares | $     $ 0     $ 0        
Aggregate cost of share | $     $ 199,283 $ 172,422   $ 461,402   $ 391,594    
Maximum percentage of shares held by the company and its subsidiaries   10.00%                
Maximum shares available for purchase (in shares)   16,900,000                
Shares acquired for cancellation (in shares)           5,300,000        
Shares acquired for equity incentive plans or potential acquisitions (in shares)           14,300,000        
Cash dividends per share declared (in dollars per share) | (per share)         SFr 1.16 $ 1.37 SFr 1.06 $ 1.19    
Payment of cash dividends | $           $ 207,853   $ 182,305    
Minimum                    
Class of Stock [Line Items]                    
Number of adjusted share capital (in shares)     155,795,958   155,795,958 155,795,958     155,795,958  
Maximum                    
Class of Stock [Line Items]                    
Number of adjusted share capital (in shares)     190,417,282   190,417,282 190,417,282     190,417,282  
Common Stock Capital Shares Reserved For Future Issuance Employee Equity Incentive Plans                    
Class of Stock [Line Items]                    
Shares that may be issued out of conditional capital (in shares)     25,000,000   25,000,000 25,000,000     25,000,000  
Common Stock Capital Shares Reserved For Future Issuance Conversion Rights Under Future Convertible Bond Issuance                    
Class of Stock [Line Items]                    
Shares that may be issued out of conditional capital (in shares)     25,000,000   25,000,000 25,000,000     25,000,000  
2023 Share Repurchase Program                    
Class of Stock [Line Items]                    
Cancellation of treasury shares (in shares) 4,100,000                  
Cancellation of treasury shares | $ $ 332,100                  
Period for which repurchase program will remain in effect (in years)   3 years                
Share repurchase, authorized amount (up to) | $   $ 1,000,000                
Stock repurchased (in shares)           5,300,000   3,000,000    
Aggregate purchase price | $           $ 461,400   $ 232,500    
Aggregate cost of share | $           17,600   $ 14,800    
Amount available for repurchase | $     $ 174,800   SFr 174,800 $ 174,800        
2020 Share Repurchase Program                    
Class of Stock [Line Items]                    
Stock repurchased (in shares)               2,600,000    
Aggregate purchase price | $               $ 159,100