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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.

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