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Acquisitions - Summary of Unaudited Pro Forma Information (Detail) - Battea - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Business Combination [Line Items]
Total Revenues	$ 6,397.6	$ 5,597.7	$ 6,047.8
Net income attributable to SS&C common stockholders	$ 731.1	$ 592.7	$ 618.8

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