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Shareholders' Equity - Narrative (Details)
SFr / shares in Units, SFr in Millions, $ in Millions
 1 Months Ended 3 Months Ended
Jun. 30, 2025
USD ($)
shares
Mar. 31, 2025
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2025
CHF (SFr)
SFr / shares
shares
Jun. 30, 2025
USD ($)
shares
Mar. 31, 2025
SFr / shares
Mar. 31, 2025
USD ($)
shares
Equity, Class of Treasury Stock [Line Items]              
Nominal share capital issued (CHF) | SFr       SFr 42.2      
Shares issued (in shares)       168,994,142 168,994,142   168,994,000
Shares, par value (in CHF per share) | SFr / shares       SFr 0.25   SFr 0.25  
Treasury, at cost, shares (in shares)       21,442,654 21,442,654   20,485,000
Adjusted share capital period (in years)       5 years      
Maximum percentage of shares held by the company and its subsidiaries       10.00% 10.00%    
Maximum shares available for purchase (in shares)       16,900,000 16,900,000    
Shares acquired for cancellation (in shares)       8,200,000      
Shares acquired for equity incentive plans or potential acquisitions (in shares)       13,200,000      
2023 Share Repurchase Program              
Equity, Class of Treasury Stock [Line Items]              
Period for which repurchase program will remain in effect (in years)     3 years        
Share repurchase, authorized amount (up to) | $     $ 1,000.0       $ 1,600.0
Increase in authorized amount under share repurchase program | $   $ 600.0          
Amount available for repurchase | $         $ 524.3    
Cancellation of treasury shares (in shares) 8,200,000            
Cancellation of treasury shares | $ $ 712.2            
Common Stock Capital Shares Reserved For Future Issuance Employee Equity Incentive Plans              
Equity, Class of Treasury Stock [Line Items]              
Shares that may be issued out of conditional capital (in shares)       25,000,000 25,000,000    
Common Stock Capital Shares Reserved For Future Issuance Conversion Rights Under Future Convertible Bond Issuance              
Equity, Class of Treasury Stock [Line Items]              
Shares that may be issued out of conditional capital (in shares)       25,000,000 25,000,000    
Minimum              
Equity, Class of Treasury Stock [Line Items]              
Number of adjusted share capital (in shares)       155,795,958 155,795,958    
Maximum              
Equity, Class of Treasury Stock [Line Items]              
Number of adjusted share capital (in shares)       190,417,282 190,417,282