Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Total revenues	$ 1,328.7	$ 1,259.0	$ 2,623.7	$ 2,492.4
Cost of revenues:
Total cost of revenues	704.4	664.0	1,379.6	1,338.3
Gross profit	624.3	595.0	1,244.1	1,154.1
Operating expenses:
Selling and marketing	139.3	97.7	250.2	189.7
Research and development	118.4	100.8	224.2	208.7
General and administrative	121.0	83.6	232.3	173.7
Total operating expenses	378.7	282.1	706.7	572.1
Operating income	245.6	312.9	537.4	582.0
Interest expense, net	(67.7)	(51.0)	(117.0)	(102.4)
Other (expense) income, net	(20.4)	6.5	(29.4)	24.5
Equity in earnings of unconsolidated affiliates, net	1.1	(0.4)	2.4	(0.1)
Loss on extinguishment of debt	(3.1)	(1.5)	(3.1)	(1.8)
Income before income taxes	155.5	266.5	390.3	502.2
Provision for income taxes	45.2	76.7	108.7	137.5
Net income	110.3	189.8	281.6	364.7
Net loss attributable to noncontrolling interest	0.3	0.0	1.1	0.0
Net income attributable to SS&C common stockholders	$ 110.6	$ 189.8	$ 282.7	$ 364.7
Basic earnings per share attributable to SS&C common stockholders	$ 0.43	$ 0.74	$ 1.11	$ 1.42
Diluted earnings per share attributable to SS&C common stockholders	$ 0.42	$ 0.71	$ 1.06	$ 1.36
Basic weighted-average number of common shares outstanding	254.9	255.7	255.3	256.4
Diluted weighted-average number of common and common equivalent shares outstanding	263.9	267.6	265.5	267.8
Other comprehensive income (loss), net of tax:
Change in unrealized (loss) gain on interest rate swaps	$ 0.3	$ (0.2)	$ 1.5	$ 0.3
Foreign currency exchange translation adjustment	(235.1)	1.9	(263.4)	10.3
Change in defined benefit pension obligation	0.0	0.1	(1.1)	0.1
Total other comprehensive income (loss), net of tax	(234.8)	1.8	(263.0)	10.7
Comprehensive income	(124.5)	191.6	18.6	375.4
Comprehensive loss attributable to noncontrolling interest	0.3	0.0	1.1	0.0
Comprehensive income attributable to SS&C common stockholders	(124.2)	191.6	19.7	375.4
Software-enabled Services [Member]
Revenues:
Total revenues	1,070.7	1,057.1	2,155.9	2,100.5
Cost of revenues:
Total cost of revenues	610.3	582.8	1,205.8	1,178.3
License, Maintenance and Related [Member]
Revenues:
Total revenues	258.0	201.9	467.8	391.9
Cost of revenues:
Total cost of revenues	$ 94.1	$ 81.2	$ 173.8	$ 160.0