v3.26.3
Earnings Per Share - Reconciles the Basic to Diluted Weighted Average Shares Outstanding (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Earnings Per Share [Abstract]        
Net income attributable to IQVIA Holdings Inc. $ 350.0 $ 331.0 $ 880.0 $ 846.0
Denominator:        
Basic weighted average common shares outstanding (in shares) 164.7 170.2 166.4 172.6
Effect of dilutive stock options and share awards (in shares) 2.3 1.5 1.6 1.5
Diluted weighted average common shares outstanding (in shares) 167.0 171.7 168.0 174.1
Earnings per share attributable to common stockholders:        
Basic (in dollars per share) $ 2.13 $ 1.94 $ 5.29 $ 4.90
Diluted (in dollars per share) $ 2.10 $ 1.93 $ 5.24 $ 4.86