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Equity Plans and Share Repurchase Program - Employee Stock Options (Details) - Stock options - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]          
Expected term in years 4 years 6 months 4 years 6 months 4 years 6 months 4 years 6 months  
Volatility 42.20% 41.70% 41.70% 42.80%  
Risk-free interest rate 3.80% 3.70% 4.20% 4.30%  
Dividend rate 0.00% 0.00% 0.00% 0.00%  
Number of Shares          
Balance - Beginning (in shares)     8.7    
Granted (in shares)     0.7    
Forfeited (in shares)     (0.1)    
Exercised (in shares)     (1.8)    
Balance - Ending (in shares) 7.5   7.5   8.7
Weighted- Average Exercise Price          
Balance - Beginning (in dollars per share)     $ 37.81    
Granted (in dollars per share)     105.38    
Forfeited (in dollars per share)     72.16    
Exercised (in dollars per share)     21.11    
Balance - Ending (in dollars per share) $ 47.80   $ 47.80   $ 37.81
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]          
Options outstanding, Weighted average remaining contractual life (in years)         3 years 1 month 6 days
Options outstanding, Aggregate intrinsic value         $ 493.8
Options vested and expected to vest, Outstanding (in shares) 7.5   7.5    
Options vested and expected to vest, Weighted average exercise price (in dollars per share) $ 47.80   $ 47.80    
Options vested and expected to vest, Weighted average remaining contractual life (in years)     3 years 1 month 6 days    
Options vested and expected to vest, Aggregate intrinsic value $ 290.0   $ 290.0    
Options exercisable, Outstanding (in shares) 5.8   5.8    
Options exercisable, Weighted average exercise price (in dollars per share) $ 37.84   $ 37.84    
Options exercisable, Weighted average remaining contractual life (in years)     2 years 4 months 24 days    
Options exercisable, Aggregate intrinsic value $ 268.3   $ 268.3    
Compensation cost not yet recognized $ 52.3   $ 52.3    
Compensation cost not yet recognized period of recognition     2 years 7 months 6 days    
Weighted-average fair value per share granted $ 31.84 $ 29.86 $ 42.39 $ 27.05  
Intrinsic value of options exercised $ 17.5 $ 42.6 $ 148.7 $ 112.5  
Fair value of options vested $ 5.7 $ 6.4 $ 20.7 $ 25.0