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Debt (Additional Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 27, 2024
May 09, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Debt Instrument [Line Items]              
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.    
Debt, interest rate     5.50%   5.50%    
Losses On Extinguishment Of Debt     $ (1.3) $ (0.5) $ (30.1) $ (1.1)  
Deferred Financing Costs     $ 4.0   $ 38.6    
6.5% senior notes due 2032              
Debt Instrument [Line Items]              
Debt, interest rate     6.50%   6.50%    
Senior secured credit facilities revolving portion [Member]              
Debt Instrument [Line Items]              
Debt Instrument Face Amount     $ 150.0   $ 150.0    
Term B-8 Loans              
Debt Instrument [Line Items]              
Debt Instrument Face Amount   $ 3,935.0          
Incremental Joinder | Term A-9 Loans              
Debt Instrument [Line Items]              
Debt Instrument Face Amount $ 800.0            
DebtInstrumentInterestRateIncreaseDecrease         0.125%    
Loss on extinguishment of debt              
Debt Instrument [Line Items]              
Losses On Extinguishment Of Debt         $ 27.7    
Base Rate | Incremental Joinder | Term A-9 Loans              
Debt Instrument [Line Items]              
DebtInstrumentInterestRateIncreaseDecrease         0.25%    
Senior Notes              
Debt Instrument [Line Items]              
Debt, interest rate   6.50%          
Senior Notes | 6.5% senior notes due 2032              
Debt Instrument [Line Items]              
Debt Instrument Carrying Amount     $ 750.0   $ 750.0   $ 0.0
Debt Instrument Face Amount   $ 750.0          
Debt, interest rate   6.50% 6.50%   6.50%   6.50%
Debt, due date   2032     2032   2032