v3.25.2
Share-Based Compensation - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares available for future grants of equity awards 7.3   7.3  
Share-based compensation expense $ 48.4 $ 40.8 $ 94.3 $ 78.8
Share-based compensation expense related to unvested stock option awards not yet recognized $ 270.8   $ 270.8  
Share-based compensation expense related to unvested awards expected to be recognized over a weighted average period     2 years  
Term Based Stock Options [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term of stock options granted     7 years  
HCM Stock Incentive Plan 2013 [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common shares outstanding 11.8   11.8  
HCM Global Employee Stock Purchase Plan [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares available for future grants of equity awards 1.0   1.0