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Earnings per Share - Computation of Basic and Diluted EPS (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share [Abstract]        
Net income attributable to SS&C common stockholders $ 164.4 $ 156.0 $ 512.3 $ 412.7
Shares attributable to SS&C:        
Weighted-average common shares outstanding – used in calculation of basic EPS 246.1 247.5 246.4 248.8
Weighted-average common stock equivalents – stock options and restricted shares 8.0 6.4 6.9 6.5
Weighted-average common and common equivalent shares outstanding – used in calculation of diluted EPS 254.1 253.9 253.3 255.3
Earnings per share attributable to SS&C common stockholders - Basic $ 0.67 $ 0.63 $ 2.08 $ 1.66
Earnings per share attributable to SS&C common stockholders - Diluted $ 0.65 $ 0.61 $ 2.02 $ 1.62