Earnings per Share - Computation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Net income attributable to SS&C common stockholders	$ 213.0	$ 157.6
Shares attributable to SS&C:
Weighted-average common shares outstanding – used in calculation of basic EPS	245.8	247.0
Weighted-average common stock equivalents – stock options and restricted shares	9.1	6.3
Weighted-average common and common equivalent shares outstanding – used in calculation of diluted EPS	254.9	253.3
Earnings per share attributable to SS&C common stockholders - Basic	$ 0.87	$ 0.64
Earnings per share attributable to SS&C common stockholders - Diluted	$ 0.84	$ 0.62

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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