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Debt - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Mar. 30, 2025
Sep. 27, 2024
May 09, 2024
Dec. 28, 2022
Mar. 28, 2019
Apr. 16, 2018
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Oct. 14, 2025
Debt Instrument [Line Items]                    
Deferred Financing Costs             $ 7.6 $ 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             $ 765.1 5,255.1 $ 749.7  
loss on extinguishment of debt, net             $ 3.3 $ 31.2 2.1  
Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Debt, interest rate 5.50%   6.50%       5.50%      
Redemption prices percentage of principal amount 100.00%                  
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 instrument term available for borrowings           5 years        
Debt principal amount           $ 250.0        
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            
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    
Senior notes             $ 750.0 $ 750.0    
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    
Senior notes             $ 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             $ 3.3 3.5 $ 2.1  
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      
Senior notes             $ 3,941.9      
Quarterly payments percentage on original principal amount [1]             (1.00%)      
Term B-8 Loans [Member] | Incremental Joinder [Member]                    
Debt Instrument [Line Items]                    
Debt principal amount                   $ 1,050.0
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] | Minimum [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 all required scheduled payments on our Term B-8 Loans and do not have any principal payments due until maturity.