Debt - Additional Information (Detail) - USD ($) $ in Millions							12 Months Ended
		Sep. 27, 2024	May 09, 2024	Dec. 28, 2022	Mar. 28, 2019	Apr. 16, 2018	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Deferred Financing Costs							$ 39.4
Debt, interest rate							5.50%
Debt Instrument Interest Rate Terms		the Base Rate (as defined in the Incremental Joinder), plus 0.50% per annum, or the Term SOFR Rate (as defined in the Incremental Joinder), plus 1.50% per annum, in each case with					the Base Rate (as defined in the Amendment), plus 1.00% per annum, or the Term SOFR Rate (as defined in the Amendment), plus 2.00% per annum.
Description of Senior Secured Credit Facilities and Senior Notes							The 6.5% Senior Notes are senior unsecured obligations and rank equal in right of payment with all of our existing and future senior indebtedness. The 6.5% Senior Notes are fully and unconditionally guaranteed, jointly and severally, by SS&C Holdings and all of its existing domestic restricted subsidiaries (other than SS&C Technologies) that guarantee our existing senior secured credit facilities and future domestic restricted subsidiaries that guarantee our existing senior secured credit facilities and certain other indebtedness. Interest on the 6.5% Senior Notes is payable semi-annually in arrears on June 1 and December 1 of each year, beginning on December 1, 2024.
Redemption/Repayment of debt							$ 5,255.1	$ 749.7	$ 599.8
loss on extinguishment of debt, net							$ 31.2	$ 2.1	5.5
Senior Notes [Member]
Debt Instrument [Line Items]
Debt, interest rate			6.50%				5.50%
Secured Debt [Member]
Debt Instrument [Line Items]
Credit facility collateral, percentage of capital stock of foreign restricted subsidiaries						65.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt maturity date							Dec. 28, 2027
Debt instrument term available for borrowings						5 years
Debt principal amount						$ 250.0
Principal amount outstanding							$ 0.0
Quarterly payments percentage on original principal amount							0.00%
Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Utilized of the letter of credit sub-facility				$ 25.0
Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Utilized of the letter of credit sub-facility				75.0
Letter of Credit [Member]
Debt Instrument [Line Items]
Debt principal amount						25.0
Letter of Credit [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt principal amount				250.0
Letter of Credit [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt principal amount				$ 600.0
Revolving Facility Amendment [Member]
Debt Instrument [Line Items]
Utilized of the letter of credit sub-facility							$ 3.7
Available Of The Revolving Facility Amendment							$ 596.3
6.5% Senior Notes due 2032 [Member]
Debt Instrument [Line Items]
Debt, interest rate							6.50%
6.5% Senior Notes due 2032 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt principal amount			$ 750.0
Debt, interest rate			6.50%				6.50%	6.50%
Debt, due date			2032				2032	2032
Principal amount outstanding							$ 750.0	$ 0.0
6.5% Senior Notes due 2032 [Member] | Tender Offer [Member]
Debt Instrument [Line Items]
Debt, interest rate							6.50%
5.5% Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Debt, interest rate							5.50%
5.5% Senior Notes due 2027 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt principal amount					$ 2,000.0
Debt, interest rate					5.50%		5.50%	5.50%
Debt, due date					2027		2027	2027
Principal amount outstanding							$ 2,000.0	$ 2,000.0
5.5% Senior Notes due 2027 [Member] | Tender Offer [Member]
Debt Instrument [Line Items]
Debt, interest rate							5.50%
Term Loans [Member]
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt							$ 3.5	$ 2.1	$ 5.5
Term B-6 Loan [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Debt principal amount						650.0
Term B-7 Loan [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Debt principal amount						$ 880.0
Term B-8 Loans [Member]
Debt Instrument [Line Items]
Debt principal amount			$ 3,935.0
Term B-8 Loans [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Debt maturity date							May 09, 2031
Principal amount outstanding							$ 3,500.0
Quarterly payments percentage on original principal amount	[1]						(1.00%)
Term Loan A-9 [Member] | Incremental Joinder [Member]
Debt Instrument [Line Items]
Debt principal amount		$ 800.0
Debt Instrument, Interest Rate, Increase (Decrease)							0.125%
Term Loan A-9 [Member] | Incremental Joinder [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Increase (Decrease)							0.25%
Deferred Gain (Loss) on Early Extinguishment of Debt [Member]
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt							$ 27.7
DST [Member]
Debt Instrument [Line Items]
Business acquisition, effective date of acquisition						Apr. 16, 2018

[1] Per the September 2024 Incremental Joinder, scheduled quarterly payments of 0.25% are required. We have made prepayments on our Term B-8 Loans and do not have any principal quarterly payments due until March 2030.