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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share [Abstract]        
Net income attributable to SS&C common stockholders $ 190.3 $ 130.7 $ 347.9 $ 256.7
Shares attributable to SS&C:        
Weighted-average common shares outstanding – used in calculation of basic EPS 246.2 248.5 246.6 249.5
Weighted-average common stock equivalents – stock options and restricted shares 6.1 6.5 6.1 6.5
Weighted-average common and common equivalent shares outstanding – used in calculation of diluted EPS 252.3 255.0 252.7 256.0
Earnings per share attributable to SS&C common stockholders - Basic $ 0.77 $ 0.53 $ 1.41 $ 1.03
Earnings per share attributable to SS&C common stockholders - Diluted $ 0.75 $ 0.51 $ 1.38 $ 1