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Basic and Diluted Earnings per Share - Computation of Basic and Diluted EPS (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Earnings Per Share [Abstract]      
Net income attributable to SS&C common stockholders $ 796.9 $ 760.5 $ 607.1
Shares attributable to SS&C:      
Weighted-average common shares outstanding - used in calculation of basic EPS 244.3 246.4 248.3
Weighted-average common stock equivalents – stock options and restricted shares 8.8 7.4 6.2
Weighted-average common and common equivalent shares outstanding – used in calculation of diluted EPS 253.1 253.8 254.5
Earnings per share attributable to SS&C common stockholders- Basic $ 3.26 $ 3.09 $ 2.45
Earnings per share attributable to SS&C common stockholders - Diluted $ 3.15 $ 3 $ 2.39